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Free Radical Biology and Medicine 87 (2015) 84–97 Contents lists available at ScienceDirect Free Radical Biology and Medicine journal homepage: www.elsevier.com/locate/freeradbiomed Regulation of catalase expression in healthy and cancerous cells Christophe Glorieux a, Marcel Zamocky b,c, Juan Marcelo Sandoval a, Julien Verrax a, Pedro Buc Calderon a,d,n a Toxicology and Cancer Biology Research Group, Louvain Drug Research Institute, Université catholique de Louvain, 1200 Brussels, Belgium Division of Biochemistry, Department of Chemistry, University of Natural Resources and Life Sciences (BOKU), A-1190 Vienna, Austria c Institute of Molecular Biology, Slovak Academy of Sciences, SK-84551 Bratislava, Slovakia d Facultad de Ciencias de la Salud, Universidad Arturo Prat, 1100000 Iquique, Chile b art ic l e i nf o a b s t r a c t Article history: Received 16 March 2015 Received in revised form 8 June 2015 Accepted 10 June 2015 Available online 25 June 2015 Catalase is an important antioxidant enzyme that dismutates hydrogen peroxide into water and molecular oxygen. The catalase gene has all the characteristics of a housekeeping gene (no TATA box, no initiator element sequence, high GC content in promoter) and a core promoter that is highly conserved among species. We demonstrate in this review that within this core promoter, the presence of DNA binding sites for transcription factors, such as NF-Y and Sp1, plays an essential role in the positive regulation of catalase expression. Additional transcription factors, such as FoxO3a, are also involved in this regulatory process. There is strong evidence that the protein Akt/PKB in the PI3K signaling pathway plays a major role in the expression of catalase by modulating the activity of FoxO3a. Over the past decade, other transcription factors (PPARγ, Oct-1, etc.), as well as genetic, epigenetic, and posttranscriptional processes, have emerged as crucial contributors to the regulation of catalase expression. Altered expression levels of catalase have been reported in cancer tissues compared to their normal counterparts. Deciphering the molecular mechanisms that regulate catalase expression could, therefore, be of crucial importance for the future development of pro-oxidant cancer chemotherapy. & 2015 Published by Elsevier Inc. Keywords: Catalase Transcription regulation Cancer Transcription factors Catalase promoter Free radicals Contents 1. 2. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85 1.1. Generalities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85 1.2. Catalase expression and activity in rodents and humans . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85 1.3. Role of catalase in healthy and cancerous cells . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85 Transcriptional regulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86 2.1. Sp1 and CCAAT-binding proteins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86 2.2. FoxO transcription factors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88 2.2.1. FoxO3a transcription factor and its regulation by the PI3K/Akt signaling pathway . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89 2.2.2. FoxO3a and coactivators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89 2.2.3. Other Forkhead box transcription factors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90 2.3. Peroxisome proliferator-activated receptor γ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90 2.4. Other transcription factors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90 2.5. Humoral factors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91 Abbreviations: Abl, Abelson murine leukemia viral oncogene homolog 1; Akt/PKB, protein kinase B; bZIP, basic leucine zipper; C/EBP-β, CCAAT-enhancer-binding protein β; Egr, early growth response; ER, estrogen receptor; Fox, Forkhead box protein; hGH, human growth hormone; HNRF, hepatocarcinogenesis-related negative-regulatory factor; JunB, JunB proto-oncogene; MAPK, mitogen-activated protein kinase; MEF, mouse embryonic fibroblast; mTOR, mammalian target of rapamycin; NF-Y, nuclear factor Y; Nrf2, nuclear factor (erythroid-derived 2)-like 2; PGC-1α, peroxisome proliferator-activated receptor γ coactivator 1α; PI3K, phosphoinositide 3-kinase; POU2F1 (Oct-1), POU domain class 2 transcription factor 1; PPARγ, peroxisome proliferator-activated receptor γ; PPRE, PPAR-response element; PTEN, phosphatase and tensin homolog; ROS, reactive oxygen species; Sirt1, Sirtuin 1; SOD, superoxide dismutase; Sp1, specificity protein 1; SV40, simian virus 40; UTR, untranslated region; WT1, Wilms tumor 1; XBP1, X-box binding protein 1 n Corresponding author. E-mail address: [email protected] (P.B. Calderon). http://dx.doi.org/10.1016/j.freeradbiomed.2015.06.017 0891-5849/& 2015 Published by Elsevier Inc. C. Glorieux et al. / Free Radical Biology and Medicine 87 (2015) 84–97 3. Other processes regulating catalase expression . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.1. Genetic alterations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.2. Epigenetic regulation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.3. Posttranscriptional and posttranslational regulations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4. Developing strategies to modulate catalase protein levels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5. Conclusions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1. Introduction 1.1. Generalities The human catalase gene is located on the short arm of chromosome 11 [1] and has all the characteristics of a housekeeping gene, with no TATA box, no initiator element sequence, and high GC content in the promoter [2]. The complete genomic DNA coding sequence for catalase has 32,420 bp and contains 12 introns and 13 exons, generating an mRNA of 2287 bp [2] encoding a single protein of 526 amino acids. The enzyme (EC 1.11.1.6), first described by Loew more than 100 years ago [3], is a homotetramer in which each monomer (62.5 kDa) contains a heme b group responsible for the enzymatic activity [4]. The human catalase belongs to the family of typical catalases [5], which predominantly catalyze the dismutation of hydrogen peroxide (H2O2) into water and molecular oxygen. In addition to its dominant “catalatic” activity (decomposition of H2O2), catalase can also decompose peroxynitrite [6–8], oxidize nitric oxide to nitrogen dioxide [9], and exhibit marginal peroxidase (i.e., oxidation of organic substrates with concomitant reduction of a peroxide ) [10] as well as low oxidase activity (O2-dependent oxidation of organic substrates) [11]. In metazoans, catalase is expressed in all major body organs, especially in the liver, kidney, and erythrocytes [12, 13], where it plays an essential role in cell defense against oxidative stress [14]. The enzyme is mainly located in peroxisomes [15, 16], but a functional catalase has also been detected in the cytoplasm [17, 18], in the mitochondria of rat cardiomyocytes [19], and on the cytoplasmic membrane of human cancer cells [20]. 1.2. Catalase expression and activity in rodents and humans Altered catalase expression has been associated with several diseases. For example, certain polymorphisms in the catalase gene have been described in diabetes, hypertension, vitiligo, Alzheimer disease, and acatalasemia, leading to decreased catalase activities [21, 22]. Catalase is frequently downregulated in human and rodent tumor tissues compared to normal tissues of the same origin [23–35]. The low levels of catalase expression correlate with a high production of H2O2, which is involved in the activation of signaling pathways to induce proliferation, migration, and invasion in cancer cells [36–38]. We have previously reported an important decrease in catalase activity in both human and murine cancer cells [39, 40]. These observations are consistent with a study by Sun et al., who showed that immortalization and transformation of mouse liver cells with SV40 (simian virus 40) resulted in a decrease in catalase expression that contributed to oncogenesis by increasing reactive oxygen species (ROS) levels in transformed cells [41]. Conversely, catalase levels increase in rat hepatocytes and astrocytes as well as in Chinese hamster V79 fibroblasts after shortduration exposure to H2O2 [42–44]. However, short-term exposures to oxidants (i.e., hydrogen peroxide, menadione, tert-butyl hydroperoxide) fail to induce catalase protein levels in MCF-7 breast cancer cells, MRC-9 normal lung fibroblasts, or PC12 rat pheochromocytoma cells [45–47]. The expression of other H2O2- 85 92 92 93 93 93 94 94 degrading enzymes (i.e., glutathione peroxidase) is induced and may counteract the increased ROS level in MCF-7 after exposure to oxidants [45]. It is noticed that the change in catalase expression, after short-term H2O2 exposure, would be influenced by several factors: the exposure time, the H2O2 concentration, the basal antioxidant enzyme capacity of the cells, and the cellular model used. Moreover, in patients suffering from mesothelioma and in rat glioma cells, catalase protein levels are increased, conferring cellular protection against epirubicin and ionizing radiation (137Cs γrays), respectively [48, 49]. Increased catalase expression has been observed in tumors from patients with gastric carcinoma, skin cancer, and chronic myeloid leukemia [50–53] and in human HL60 cancer cells rendered resistant to chronic exposure to H2O2 [54–56]. This high catalase expression has also been observed in several human cancer cell lines (e.g., gastric, oral, pancreatic, bladder) exposed to cisplatin [57], ascorbic acid [58], bleomycin [59], gemcitabine [60], mitomycin C [61], hormonal therapy [62], and ionizing radiation [63]. 1.3. Role of catalase in healthy and cancerous cells The importance of catalase for human life is illustrated by the diseases that are associated with mutations of its gene. For example, acatalasemia is an autosomally inherited deficiency of erythrocyte catalase due to guanine-to-adenine substitution (Japanese type A), threonine deletion (Japanese type B), or guanine– adenine insertion (Hungarian type) [64–66]. Acatalasemia is characterized by a specific catalatic activity of less than 5% compared to normal rates; it is still rare and usually benign but can sometimes be problematic, resulting in oral gangrene ulceration for Japanese patients or in essential hypertension [67–69]. Catalase polymorphism has also been associated with the occurrence of diabetes, vitiligo, or Alzheimer disease [21, 22]. Regarding catalase downregulation, it should be noted that catalase-deficient mice are viable and fertile [70]. They develop normally with a normal hematological profile, but after trauma the mitochondria show defects in oxidative phosphorylation. This phenotype could be explained by the presence of other H2O2-degrading enzymes such as glutathione peroxidases and peroxiredoxins. On the other hand, the enzyme was also overexpressed in mice. Mitochondrial catalase overexpression in mice enables a life-span increase of 20% [71]. In these mice, the mitochondrial deletions are reduced; they prevent heart disease and the onset of cataracts. As previously cited, the first function assigned to catalase is the transformation of hydrogen peroxide into oxygen and water (2 H2O2 - 2 H2O þ O2). It thus plays an important role in defending cells against oxidative damage by degrading hydrogen peroxide. However, increasing evidence suggests that catalase is also involved in various other processes. Indeed, ROS are able to activate various signaling pathways, such as that of mitogen-activated protein kinase (MAPK) to increase the capacity for proliferation, migration, and invasion [38]. Catalase can modulate the growth rate by various mechanisms, the first obviously being its ability to detoxify H2O2. The second is its ability to bind and protect certain proteins from potential oxidative damage, 86 C. Glorieux et al. / Free Radical Biology and Medicine 87 (2015) 84–97 such as Grb2 and SHP2, involved in integrin pathways, which in turn are themselves involved in the processes of proliferation and migration [72, 73]. As shown by many reports, catalase and mitochondrial superoxide dismutase control cell growth and migration processes in cancer cells [74–77]. Surprisingly, when exposed to UVB rays, catalase can also produce ROS via NADH oxidation [78]. In addition, overexpression of catalase protects cells against DNA damage induced by UVB and X-rays [79, 80]. Catalase, as catalase-peroxidase, also possesses oxidase activity [11]. The oxidase activity requires oxygen in addition to electron donors as it is heme-dependent. Phenols (benzene derivatives), alcohols, aryl amines, and other carcinogens are substrates and/or inhibitors of oxidase function. Certain metabolites, when metabolized by catalase, are active as indole and the neurotransmitter β-phenethylamine [11]. Thus, catalase may also have additional roles such as the detoxification or activation of toxic and anti-tumor compounds. We have explored a potential role of catalase during the acquisition of cancer cell resistance to chemotherapeutic agents. To this end, we overexpressed human catalase in MCF-7 cells, a human-derived breast cancer cell line. No particular resistance against conventional chemotherapies such as doxorubicin, cisplatin, or paclitaxel was observed in cells overexpressing catalase, but cells were more resistant to the pro-oxidant combination ascorbate and menadione [74]. This association generates a redox cycling that induces ROS production (mainly H2O2) and exhibits a strong preferential ability to kill cancer cells [39, 40, 74]. Tumor cells frequently produce large amounts of reactive oxygen species [81]. This can be explained by the presence of mitochondrial defects and a decreased expression of antioxidant enzymes such as catalase or manganese superoxide dismutase [82, 83]. Instead of the phenotype observed in catalase-knockout mice and acatalasemic patients, the expression of other antioxidant enzymes is also altered in cancer cells [83]. ROS play an important role in tumorigenesis and tumor progression by inducing DNA mutations and genomic instability. On the other hand, high levels of ROS can induce cell death and alterations in redox regulation and redox signaling conducted for the development of potential anti-cancer therapies [84–87]. The structure, the mechanism of enzyme activity, and the phylogeny of catalase have already been extensively reviewed [5, 88–92]. However, the molecular mechanisms controlling catalase expression are still poorly understood, as are those explaining the altered expression of catalase in cancer cells. Therefore, the aim of the following sections is to review current knowledge regarding the various mechanisms known to regulate catalase expression. To this end, the critical roles played by Sp1 (specificity protein 1), NF-Y (nuclear factor Y), FoxO (Forkhead box protein O), and other transcription factors such C/EBP-β (CCAAT-enhancer-binding protein β), PPARγ (peroxisome proliferator-activated receptor γ), and Oct-1 (POU2F1), as well as the pathways regulating their activities in normal and cancer cells, will be considered. Regulation at other levels, including genetic, epigenetic, and posttranscriptional modifications, will also be discussed. 2. Transcriptional regulation The human catalase gene was first described in 1986 [2]; rat and mouse catalase genes were isolated and characterized in the next decade [93, 94]. Catalase expression is predominantly regulated at the level of transcription by transcription factors that induce or repress the transcriptional activity of human and rodent catalase promoters. Fig. 1 shows these transcription factors, specifying both the species and the exact position of the binding sites as obtained from the literature. Moreover, the bioinformatics analysis of catalase promoters among different species shows the presence of a major regulatory region in which Sp1, NF-Y, and C/ EBP-β DNA binding induces activation of catalase gene transcription (Figs. 1 and 2). 2.1. Sp1 and CCAAT-binding proteins The catalase core promoters, located approximately in the first 200 bp of the upstream region of the catalase promoters, are rich in GC residues and contain both GGGCGG and CCAAT boxes (Fig. 2). As previously mentioned, transcription factors, such as Sp1 and NF-Y, which respectively bind to these two boxes, regulate the transcription of several genes and the subsequent expression of proteins, including human α1(I) collagen [95], α7-nicotinic receptor [96], human γ-globin [97], and homeobox B4 [98]. Moreover, given the capacity of Sp1 to recruit RNA polymerase II [99], Sp1 is of critical importance to drive the transcription of TATA-less gene promoters, such as human glypican 3 [99], lens epitheliumderived growth factor/p75 [100], and survivin [101]. Because of the characteristics of the catalase core promoter, it has been hypothesized that these two transcription factors (Sp1 and NF-Y) may have a role in the positive regulation of catalase expression. A nice mechanistic study conducted by Nenoi et al. showed that these factors regulate the expression of catalase in cancer cells [55]. Indeed, compared to the parental cell line, increased expression of catalase was observed in HP100 human leukemia cells (derived from HL-60 cells rendered resistant to H2O2). This phenotype was associated with high nuclear levels of both Sp1 and NF-Y, which bind, respectively, to the GGGCGG box located 70 bp and to the CCAAT element located 92 bp (Fig. 2) [55] from the start transcription site (þ1) defined by Yoo et al. [102]. In the same study, the authors showed that Sp1 activity, and as a consequence the expression of catalase, may be downregulated by its interaction with another transcription factor related to a member of the Egr (early growth response) protein family under specific circumstances. Indeed, HP100 cells exposed to an ROS-generating system (X-rays) showed lower catalase activities compared to unexposed cells [55]. The explanation proposed by these authors was the induction of an Egr-related factor, competing with an overlapping Sp1/Egr1 recognition sequence located within the core promoter of the catalase gene [55]. Indeed, both transcription factors, namely Sp1 and Egr1, have opposite transactivating effects when they share an overlapped sequence. Therefore, this association may lead to promoter impairment by disturbing or competing with the transactivating ability of Sp1 [103]. A similar effect of WT1 (Wilms tumor 1) on Sp1 activity was observed in a multistep chemical carcinogenesis mouse model. The induction of cell carcinoma led to increased expression of WT1, which binds to the GC box, probably reducing the binding of Sp1 to the same element, and leading to the loss of catalase promoter transactivation (Figs. 1 and 2) [29]. NF-Y positively regulates catalase expression by binding the CCAAT box in the mouse core promoter (Figs. 1 and 2) [94, 104]. The NF-Y binding and the subsequent catalase transcription are enhanced by X-box binding protein 1 (XBP1) via an unknown mechanism interfering with the NF-Y/catalase promoter complex formation [105]. XBP1 is a major endoplasmic reticulum stresslinked transcriptional factor that belongs to the basic region/leucine zipper (bZIP) family and is activated on accumulation of unfolded protein [106]. In this context, decreased catalase expression associated with increased sensitivity to H2O2 was observed in XBP1-deficient MEFs (mouse embryonic fibroblasts) compared to wild-type cells [105]. Interestingly, this phenotype was reversed by XBP1 overexpression [105]. Because the human catalase promoter also contains NF-Y DNA binding sites (Figs. 1 and 2) [55], it is expected that XBP1 may regulate NF-Y binding activity, thus affecting human catalase expression. Indeed, genetic manipulation, for example, knockdown of XBP1 by small interfering RNA (siRNA), C. Glorieux et al. / Free Radical Biology and Medicine 87 (2015) 84–97 87 Fig. 1. Transcription factor binding sites in human, mouse, and rat catalase promoters. Because authors labelled different transcription start sites in their publications, the positions of the transcription binding sites in this table were all defined from the ATG translation start ( þ1). Abbreviations: FoxM1, Forkhead box protein M1; Oct-1/POU2F1, POUdomain class 2 transcription factor 1; PPARγ, peroxisome proliferator-activated receptor γ; NF-Y, nuclear factor Y; Sp1, specificityprotein1; C/EBP-β, CCAAT-enhancerbinding protein β; FoxO1, Forkhead box protein O; HNRF, hepatocarcinogenesis-related negative regulatoryfactor; and WT1, Wilms tumor 1. resulted in reduced expression of catalase and superoxide dismutase genes in both human retinal pigment epithelium [107] and glioma cell lines [108]. In addition to Sp1 and NF-Y, C/EBP-β, a member of the bZIP family of transcription factors implicated in gene regulation of immune and inflammatory responses [109], is another factor involved in the transcriptional activation of the catalase gene in rats (Figs. 1 and 2). Taniguchi et al. showed that a C/EBP-β binding element on the rat catalase promoter was critical for transcription from multiple initiation sites and that C/EBP-β actually binds to this site, regulating gene transcription in the catalase promoter [110]. In addition to GGGCGG and CCAAT boxes, analysis of the promoter region in the rat catalase gene reveals a pair of invertedrepeat motifs located at the 54/ 41 and 104/ 91 positions (before the first ATG codon). Such motifs have also been identified in human and mouse catalase promoters, and the core sequence of this element is GYCMGGCCCKCTCYKG, where Y ¼ T or C, M ¼ A or C, and K ¼ G or T [111]. Functional analysis of this promoter region, performed on the first motif, revealed that four different and still undetermined proteins were observed to bind to this sequence, affecting catalase gene expression [111]. Interestingly, the region surrounding the former inverted-repeat region ( 72/ 26) seems to hold basic promoter activity and includes the C/EBP-β binding site mentioned before ( 45/ 34) [111]. Because the first 200 bp of the upstream region of the catalase promoter is the best characterized and is well conserved in humans and rodents, the search for homologous sequence regions in genomes of related vertebrates was explored. Fig. 2 presents highly conserved regions that were detected in the multiple sequence alignment of 15 phylogenetically related sequences of genomic segments of the catalase promoter regions from selected vertebrate genomes. Although the transcription start site, known from the human catalase promoter [102], is not perfectly conserved among all presented sequences (Fig. 2), a high level of conservation may be observed mainly in regions identified as binding sites for various transcription factors that have already been mentioned. It is interesting to see that in the upper part of this DNA alignment, the motif CCAAT occurs twice in close proximity. However, for effective binding of NF-Y, the embedding motifs are also essential, as already shown in humans and mice (Figs. 1 and 2). Hence, only the posterior region labeled with asterisks in Fig. 2 is capable of NF-Y binding, and the preceding motif labeled with solid circles may be just the product of a short duplication event with as yet unknown binding capability for transcription factors. The next conserved region responsible for Sp1/ Egr/WT1 binding (Fig. 2, upper right) is highly conserved among primates. Interestingly, there is a short insertion in the gibbon sequence and a long insertion in the rhesus sequence that can influence the binding of these transcription factors. For rodents and for the fish sequence there are deletions at the same place, so the real binding of Sp1/Egr/WT1 in all these organisms has to be verified experimentally. For the C/EBP-β transcription factor (Fig. 2, lower part), a longer insertion can be observed in the fish sequence and a slight modification with a short insertion in the rodent sequence. Again, this sequence motif is highly conserved among primates, indicating strong binding ability. Thus, it may be concluded that a rather high degree of sequence conservation in the presented region only among mammals reveals that a multiple transcriptional regulation within the catalase promoter was developed during an extensive evolution to high complexity 88 C. Glorieux et al. / Free Radical Biology and Medicine 87 (2015) 84–97 Fig. 2. Multiple sequence alignment of the upstream promoter region of 15 selected catalase genes. Multiple sequence alignment was performed with MUSCLE software (R.C. Edgar, Mill Valley, CA, USA) taking the upstream promoter region of 15 selected catalase genes including sequences from primates, nonprimate mammals, rodents, and zebrafish. Color scheme: blue, 485% sequence identity; green, 50–85%; yellow, 25–50%; and white, o 25%. The consensus sequence is obtained from the most frequent nucleotide residue found at each position. Important regions, discussed in the text, are highlighted with asterisks. A conserved CCAAT region is also noted with closed circles. GenBank accession numbers: Homo sapiens (human), NG_013339.1; Pongo abelii (orangutan), NW_002885194.1; Pan troglodytes (chimpanzee), NW_003457670.1; Pan paniscus (pygmy chimpanzee), NW_003870611.1; Gorilla gorilla (gorilla), CABD02060366.1; Nomascus leucogenys (white-cheeked gibbon), NW_003501373.1; Macaca mulatta (rhesus macaque), NW_001100376.1; Callithrix jacchus (common marmoset), NW_003184090.1; Otolemur garnettii (greater galago), NW_003852396.1; Rattus norvegicus (brown rat), AC_000071.1; Mus musculus (house mouse), NT_039207.8; Bos taurus (cattle), NW_003104419.1; Sus scrofa (wild boar), CU582930.10; Canis familiaris (dog), NC_006596.3); and Danio rerio (zebrafish), NW_003336217.1. Abbreviations: NF-Y, nuclear factor Y; Sp1, specificity protein 1; WT1, Wilms tumor 1; Egr, early growth response; C/EBP-β, CCAAT-enhancer-binding protein β; and ORF, open reading frame. within mammalian genomes and remains to be compared with the regulation of other antioxidant enzymes in various vertebrates. Table 1 summarizes additional transcription factors, coactivators, and/or signaling pathways that have been involved either as activators or as repressors controlling catalase gene expression. They will be discussed in the next sections. 2.2. FoxO transcription factors The FoxO family consists of four proteins (FoxO1, 3a, 4, and 6) that regulate hormonal, nutrient, and stress responses. They share marked similarity in structure, function, and regulation in mammalian organisms [112]. Regulation of the FoxO protein family is posttranslationally controlled by the Akt/PKB signaling pathway [113, 114]. Indeed, the serine/threonine kinase, Akt, phosphorylates FoxO, which is consequently excluded from the nucleus by 14-3-3 protein and degraded by the ubiquitin proteasome system [113, 114]. In this context, FoxO3a and other Forkhead box family members such FoxO1 and FoxM1 (Forkhead box protein M1) have been mentioned as positive regulators of catalase expression (Fig. 1 and Table 1). C. Glorieux et al. / Free Radical Biology and Medicine 87 (2015) 84–97 Table 1 Activators and repressors involved in transcriptional regulation of the catalase gene Transcription factor/ coactivator/signaling pathway Cell/tumor type Transcriptional activators that control catalase gene expression Sp1 Human HL-60 and HP100 promyelocytic leukemia cell lines NF-Y Human HL-60 and HP100 promyelocytic leukemia cell lines Rat liver cells Mouse muscle cells XBP1 and NF-Y Human HeLa cervical cancer cell line Human retinal pigment epithelial cells Human glioma cell lines Mouse embryonic fibroblasts C/EBP-β Rat Reuber hepatoma cell line FoxO3a Rat cardiomyocytes Rat vascular smooth muscle cells Mouse embryonic fibroblasts FoxO3a, PGC-1α, and Sirt1 Human HeLa cervical cancer cell line Rat PC12 pheochromocytoma cells Mouse embryonic fibroblasts Sirt1 mediated Human proximal tubular cell lines Rat heart and adipose tissues FoxM1 Human primary fibroblasts and U2OS osteosarcoma cells Mouse embryonic fibroblasts FoxO1 Rat vascular smooth muscle cells Rat glomerular mesangial cells PPARγ Human differentiated primary adipocytes Human melanocytes Rat brain microvascular endothelial cells Rat oligodendrocytes Rat cardiomyocytes Rat astrocytes Rat fibroblasts Mouse neuronal cells Mouse adipocytes Oct-1 Human hepatocellular carcinoma cell lines Nrf2 Mouse cardiac fibroblasts Mouse macrophages Mouse myocardiac cells PR Human breast cancer cells and normal epithelial breast cells MAPK signaling Human MCF-7 breast cancer cell line Transcriptional repressors that control catalase gene expression WT1/Egr-related factor Human HL-60 and HP100 promyelocytic leukemia cell lines WT1 Mouse benign papilloma and malignant carcinoma (cells and tissues) HNRF Rat hepatoma cells ER Human breast cancer cell lines PI3K/Akt/mTOR (signaling Human MCF-7 breast cancer cell line pathways) Human non-small-cell lung cancer cell lines Human HepG2 hepatoma cell line Human airway smooth muscle from asthmatic and chronic obstructive pulmonary disease patients Rat vascular smooth muscle cells Ref. [55] [55] [93] [104] [105] [107] [108] [105] [110] [118] [119] [127] [130] [130] [129] [132] [131] [133] [133] [134] [135] [139] [147] [140] [142] [143] [144] [145] [146] [141] [155] [157] [158] [159] [172] [170] [55] [29] [166] [171] [120] [123] [124] [173] [119] Abbreviations: FoxM1, Forkhead box protein M1; Oct-1/POU2F1, POUdomain class 2 transcription factor 1; PPARγ, peroxisome proliferator-activated receptor γ; NF-Y, nuclear factor Y; Sp1, specificityprotein1; C/EBP-β, CCAAT-enhancer-binding protein β; FoxO, Forkhead box protein O; PGC-1α, peroxisome proliferator-activated receptor γ coactivator 1α; HNRF, hepatocarcinogenesis-related negative regulatoryfactor; WT1, Wilms tumor 1; XBP1, X-box binding protein 1; Sirt1, Sirtuin 1; Nrf2, nuclear factor (erythroid-derived 2)-like 2; PR, progesterone receptor; MAPK, mitogen-activated protein kinase; hGH, human growth hormone; Egr, early growth response; ER, estrogen receptor; PI3K, phosphoinositide 3-kinase; Akt/PKB, protein kinase B; mTOR, mammalian target of rapamycin). 2.2.1. FoxO3a transcription factor and its regulation by the PI3K/Akt signaling pathway Among many other target genes, FoxO3a transcription factor regulates the expression of antioxidant enzymes, such as catalase and 89 mitochondrial superoxide dismutase, mainly in rodents [115–117]. In rats, FoxO3a positively regulates catalase expression by binding to the ATAAATA sequence in its promoter (Fig. 1) [118]. Consequently, silencing FoxO3a leads to a reduction in the levels of catalase mRNA and protein in isolated rat cardiomyocytes [118] and in catalase protein levels in rat vascular smooth muscle cells [119]. Nevertheless, in MCF-7 cells (a human breast cancer cell line), modulating FoxO3a expression by using either knockdown or overexpression strategies did not change the expression of catalase [120]. Although putative FoxO3a binding sites have not been identified in the human catalase gene, the involvement of other Forkhead box family members cannot be excluded (i.e., FoxO1, FoxO4). In fact, these transcription factors share high similarity in their structure, function, and regulation [112] and maybe counteract the loss of FoxO3a in cells. Increased catalase expression was observed when rat vascular smooth muscle [119] and human MCF-7 cancer cells [120] were incubated in the presence of LY294002, a well-known PI3K (phosphoinositide 3-kinase) inhibitor, provoking inhibition of the PI3K/Akt signaling pathway. Given that FoxO3a activity is repressed after its phosphorylation by Akt kinase [121], inhibition of the PI3K/Akt pathway hinders the phosphorylation of FoxO3a and prevents its translocation out of the nucleus. Because LY294002 can also inhibit the kinase mTOR (mammalian target of rapamycin) [122], the effect of rapamycin (an mTOR inhibitor) has also been studied. As with LY294002, rapamycin increased the expression of catalase in MCF-7 cells [120]. In human non-small-cell lung cancer cell lines, the protein phosphatase PTEN (phosphatase and tensin homolog) inhibits the PI3K/Akt pathway and, most likely by this method, increases the protein levels of catalase and other antioxidant enzymes, such as superoxide dismutase and glutathione peroxidase [123]. Conversely, activation of the PI3K/Akt pathway by arsenite treatment of HepG2 (human hepatoma) cells led to a decrease in catalase protein levels [124]. These results suggest that, in human cancer cells, downregulation of catalase is dependent on PI3K/Akt/mTOR, most likely via a putative unknown nuclear repressor, whereas FoxO3a does not play a critical role. Indeed, experimental evidence showing that FoxO3a regulates the expression of catalase has been mainly observed in mouse and rat cells (Fig. 1 and Table 1). However, in human breast MCF-7 cells, modulation of FoxO3a, either by enhancing or by decreasing its levels, did not affect the expression of catalase [120]. 2.2.2. FoxO3a and coactivators The need for some coactivators during catalase expression by FoxO3a has also been evoked. Indeed, the FoxO3a transcription factor cooperates with the transcriptional coactivator peroxisome proliferator¼ activated receptor γ coactivator 1α (PGC-1α) and the histone deacetylase Sirt1 (Sirtuin 1), to regulate the expression of catalase. PGC-1α is a positive regulator of mitochondrial function and oxidative metabolism [125] and has been involved in the regulation of gene transcription implicated in ROS detoxification [126]. When MEF cells were made double knockout (KO) for FoxO3a and PGC-1α, they displayed decreased levels of antioxidant enzymes (catalase, superoxide dismutase, and some peroxiredoxins) [127]. Interestingly, the overexpression of FoxO3a in MEF cells with only PGC-1α knocked out did not modify catalase expression, suggesting that FoxO3a requires the presence of PGC-1α to induce catalase expression [127]. Sirt1 is also involved in FoxO transcriptional activity and, most likely, in catalase expression. Sirt1 belongs to a family of NAD (þ)-dependent protein-modifying enzymes with activities in lysine deacetylation and is involved in the regulation of gene expression, DNA damage repair, metabolism, and survival [128]. Both FoxO3a and PGC-1α are activated by Sirt1-mediated deacetylation, 90 C. Glorieux et al. / Free Radical Biology and Medicine 87 (2015) 84–97 thereby increasing the formation of FoxO3a/PGC-1α complexes and modulating the expression of catalase and other antioxidant enzymes in normal and cancer cell lines [129, 130]. In support of this model of a cooperative regulatory process, when Sirt1 activity was stimulated in heart and adipose tissues by exercise training in rats, increased levels of both FoxO3a and catalase were observed [131]. Furthermore, the use of Sirt1 inhibitors decreased catalase expression, whereas their overexpression increased catalase expression in human proximal tubular cell lines [132]. either by cytosolic molecules that interfere with signaling or related to a direct effect of PPAR agonists/antagonists [151]. Finally, PPARγ-mediated transcriptional activation of its target genes is a plausible explanation for PI3K/Akt signaling regulation. A clear example is the activation of the tumor suppressor PTEN. This protein dephosphorylates inositol phospholipid intermediates of the PI3K pathway, inhibiting activation of downstream targets, such as Akt, in both normal and cancer cells [152, 153]. 2.4. Other transcription factors 2.2.3. Other Forkhead box transcription factors The transcription factor FoxM1 has been shown to positively modulate catalase expression and the FoxM1 binding sequence was identified as TGTTTGTT in the first intron (Fig. 1). FoxM1 has critical functions in tumor development and progression. Indeed, it is induced by the oncogene Ras and is essential for the regulation of ROS levels in primary human fibroblasts [133]. Another member of the Forkhead transcription factor family, FoxO1, cooperates with PGC-1α to bind the rat catalase promoter at the consensus sequence TTATTTAC (Fig. 1) [134]. The suppression of PGC-1α activity due to covalent modifications caused by the protein kinase Akt or the histone acetyltransferase general control nonderepressible 5 (Gcn5) prevents DNA binding of FoxO1 to the catalase promoter and represses the expression of the enzyme [134]. Moreover, overexpressing an active form of FoxO1 stimulated the levels of catalase protein in rat glomerular mesangial cells [135]. To our knowledge, no data have been reported about a putative role of FoxO1 on catalase expression in cancer cells. 2.3. Peroxisome proliferator-activated receptor γ An additional well-known activator of the transcription of the catalase gene is PPARγ. The family of PPARs contains three members (PPARα, β/δ, and γ) and plays an essential role in the regulation of development and lipid metabolism [136, 137]. PPARs mostly form heterodimers with retinoid X receptor before binding to the PPRE (PPAR-response element) of their target genes [138]. Fig. 1 shows that PPARγ binds to a PPRE sequence TGACCTTTGCAAA in the human catalase promoter and subsequently induces catalase gene transcription [139]. Other PPRE sequences have been reported in rodent catalase promoters [140, 141] (Fig. 1), and increased catalase expression mediated by PPARγ agonists (e.g., pioglitazone) has been observed in rat oligodendrocytes, cardiomyocytes, fibroblasts, and astrocytes [142–145]. Moreover, neurons from PPARγ mutant mice showed a decrease in the expression of catalase and other antioxidant enzymes, such as superoxide dismutase and glutathione Stransferase; impaired expression of prosurvival genes; and greater damage as a result of oxidative stress [146]. Silencing PPARγ in human melanocytes also decreased catalase expression, whereas cell exposure to 2,4,6-octatrienoic acid (a PPARγ activator) led to increased levels of catalase in these cells [147]. Recently, inhibition of PPARγ transcription activity by the Parkinson disease-related protein α-synuclein led to decreased levels of catalase mRNA, protein, and enzyme activity in murine cells [148]. The likely explanation for this effect is an alteration in the levels of polyunsaturated fatty acids and their metabolites, reducing the availability of PPARγ-related ligands, such as linoleic acid, prostaglandin J2, etc. [148]. Several studies have also demonstrated a link between PPARγ and the PI3K/Akt signaling pathway [148, 149], a well-known pathway repressing catalase expression. Because PPARs undergoing nuclear translocation after ligand activation showed both perinuclear and cytoplasmic distribution [150], the inhibitory effects triggered by PPARγ on the PI3K/Akt pathway may be indirect, Table 1 also shows other transcription factors, namely Oct-1 and Nrf2 (nuclear factor (erythroid-derived 2)-like 2), playing a role as potential activators of catalase expression. Their precise involvement is difficult to establish because the experimental data supporting their role are scarce and somewhat controversial. The POU-domain transcription factor Oct-1 (POU2F1) regulates a large group of target genes such Prdx2 (peroxiredoxin 2), Ifi202b (interferon-activated gene 202B), and Timp3 (tissue inhibitor of metalloproteinases-3) and acts as a sensor of oxidative and metabolic stress [154]. This factor binds to the human catalase promoter at the octamer consensus sequence ATTAAATA and positively regulates catalase expression (Fig. 1) [155]. Hypermethylation of the Oct-1 promoter led to a low expression of Oct-1 and subsequently a decrease in catalase protein levels in hepatocarcinoma cells exposed to H2O2 [155]. It has been reported that Nrf2, a pleiotropic transcription factor involved in cellular defenses against oxidative stress, increases the expression of several antioxidant enzymes, including catalase [156]. Conversely, their expression was significantly lower in various cell types derived from Nrf2 / mice compared to those from wild-type control animals [157–159]. Nevertheless, because no antioxidant-response element sequences were found in the catalase promoters and there is no evidence that Nrf2 can bind directly to the catalase promoters, the involvement of Nrf2 in the regulation of catalase expression remains controversial. Few transcription factors have been identified as repressors of catalase gene transcription. Among them are WT1/Egr family members (Figs. 1 and 2), HNRF (hepatocarcinogenesis-related negative regulatory factor), and ER transcription factors (Table 1). Moreover, the PI3K/Akt/mTOR signaling pathway plays a major role in catalase downregulation in human cancer cell lines (Table 1) by repressing Forkhead box family members and/or by activating an unknown nuclear repressor. As previously mentioned, an additional transcription factor acting as a repressor of catalase expression in cancer cells is WT1, whose gene is located in human chromosome 11 in the vicinity of the catalase gene [160]. WT1 can control the development of several organs and tissues, by activation or repression of numerous target genes, resulting in a wide variety of biological effects, including growth, differentiation, and apoptosis [161]. WT1 protein can be detected as four isoforms generated by alternative splicing. WT1 protein is part of the Cys2–His2 zinc finger transcription factor family and shares nearly 60% homology with Egr1 at the DNA-binding domain [162]. WT1 (in particular the WT1-KTS isoform) binds Egr1 or Egr-like protein in cancer cells [163, 164], and a specific WT1 binding site has been proposed, namely GCGTGGGAGT (called WTE), which displays 20- to 30-fold higher affinity for the Egr binding sites [165]. Although it is not clear which isoform is responsible for the repression of catalase expression [29, 55], the mechanism involved in this process may include (i) competition with activator proteins, such as Spl or Egr1, for GC-rich binding sites; (ii) reduction in the activity of nearby bound activator proteins; and (iii) titration of cofactors required for activation (“squelching”) [162]. In rat hepatoma cell lines, decreased catalase expression was C. Glorieux et al. / Free Radical Biology and Medicine 87 (2015) 84–97 related to the presence of a 20-kDa nuclear protein named HNRF [166]. Using reporter and electrophoretic mobility-shift assays, it was further shown that HNRF binds to the site sequence GATATCCCGATATC, located 3 kb upstream of the catalase gene (Fig. 1). Interestingly, dedifferentiated rat hepatoma cells expressed this factor, whereas well-differentiated cells did not, suggesting a role for HNRF as a trans-repressor in the negative regulation of catalase gene expression during liver carcinogenesis [166]. In addition to the transcription-activating factors previously discussed in this review, we hypothesize that another factor may be involved in the positive regulation of catalase expression. Based on preliminary results, we postulate that Jun family proteins may activate transcription of the catalase gene in human cells. The predicted site for JunB is TGACCCA, located at position 1352/ 1346 (from the ATG codon start) in the human catalase promoter (Fig. 3A). This predicted site is conserved among animal species (Fig. 3B). Interestingly, there is a long insertion in the rat, mouse, and macaque promoter sequences (not shown), suggesting that the binding site does not exist in this particular region of the promoter for these species. Two lines of evidence support this hypothesis: first, using chromatin immunoprecipitation (ChIP) assays, we showed that JunB binds to the human catalase promoter in the HepG2 and MCF-7 cell lines (Fig. 3C). Moreover, the 91 use of specific siRNA against JunB led to a decreased level of catalase in these cells (Figs. 3D and 3E). The exact molecular mechanisms by which JunB and other transcriptional regulators mediate catalase transcription are currently under study. 2.5. Humoral factors Several hormones may control catalase transcription. The first studies reporting decreased expression of catalase by a humoral factor were conducted in tumor-bearing mice. Indeed, decreased levels of catalase were reported in liver tissues adjacent to transplanted tumors, but when tumors were removed, catalase expression returned to normal levels [167–169]. These results suggested that humoral factors produced by the tumors may regulate the expression of catalase in surrounding normal tissues. However, this phenomenon was not observed in other organs (e.g., the kidney) and seemed to be restricted to liver cells [32]. Since these early studies, several hormones have been reported to be involved in the regulation of catalase expression. For example, autocrine production of human growth hormone (hGH) in mammary carcinoma MCF-7 cells positively regulates the expression of the catalase gene and other antioxidant enzymes, such as superoxide dismutase, glutathione peroxidase, and Fig. 3. The JunB transcription factor regulates positively catalase transcription. (A) Transcription factors controlling human catalase gene expression. The localization of PPARγ, Oct-1, NF-Y, Sp1, and FoxM1 binding sites on the human catalase gene are listed in Table 1. The predicted site for JunB is TGACCCA, located at position 1352/ 1346 (from the ATG codon start) in the human catalase promoter. (B) Selected part (human JunB binding site TGACCCA) of the multiple sequence alignment of 12 catalase promoters. Color scheme: blue, 475% sequence identity; green, 50–75%; yellow, 25–50%, and white, o 25%. The consensus sequence is obtained from the most frequent nucleotide residues found at each position. (C) ChIP analysis using a JunB-specific antibody or an IgG control antibody to detect JunB occupancy at the promoter of the human catalase gene in MCF-7 breast cancer and HepG2 hepatocellular carcinoma cell lines. Data are expressed as relative occupancy obtained with the following calculation: 2 EXP (CT input CT ChIP 1500)/2 EXP (CT input CT ChIP þ 1000). The catalase gene region around nucleotide þ 1000 was used as a negative locus in which JunB binding sites were not found. The relative occupancy can be considered as a ratio of specific signal (ChIP 1500) over background (ChIP þ 1000). (D) Western blots showing JunB knockdown and catalase expression in human MCF-7 and HepG2 cell lines. β-Actin was used as a loading control. (E) Bands obtained via Western blot analysis were quantified, using ImageJ software (National Institutes of Health, Bethesda, MD, USA). Catalase protein expression was normalized to that of β-actin and cells incubated with control siRNA. Data are means 7 SEM, from three separate experiments. Data were analyzed using an unpaired t test, performed with GraphPad Prism software (GraphPad Software, San Diego, CA, USA). *p o 0.05, **p o 0.01. Abbreviations: PPARγ, peroxisome proliferator-activated receptor γ; Oct-1, POU domain class 2 transcription factor 1; NF-Y, nuclear factor Y; Sp1, specificity protein 1; and FoxM1, Forkhead box protein M1. 92 C. Glorieux et al. / Free Radical Biology and Medicine 87 (2015) 84–97 glutamylcysteine synthetase, in a p44/42 kinase-dependent manner [170]. Indeed, use of the MAPK inhibitor PD098059 abrogated the effect of hGH on catalase regulation [170]. Steroid hormones also seem to regulate the expression of catalase. Indeed, in ER-positive MCF-7 breast cancer cells, the expression of catalase was decreased by exposing the cells to estrogens. Conversely, tamoxifen (an estrogen receptor blocker) provoked the opposite effect [171]. As expected, this effect was not observed in ER-negative MDA-MB-231 breast cancer cells, confirming a putative role of the estrogen receptor pathway in the regulation of catalase expression [171]. Progesterone was shown to be a potent inducer of catalase activity in both normal and breast cancer cells, an effect mediated via the progesterone receptor B isoform [172]. Finally, the extracellular protein transforming growth factor β activates PI3K/Akt and SMAD3 (mothers against decapentaplegic homolog 3) signaling pathways and decreased the protein levels of catalase and superoxide dismutase in mouse airway muscle cells [173]. 3. Other processes regulating catalase expression Genetic alterations and epigenetic, posttranscriptional, and posttranslational modifications have also been discussed as regulators of the transcription of the human catalase gene and are summarized in Table 2. 3.1. Genetic alterations Gene amplification, loss of heterozygosity, and deletion of chromosomal arms are common genetic alterations detected in tumors and cancer cells (Table 2). Decreased activity of catalase has been observed in various genetic alterations, for example, loss of alleles (i.e., loss of hete- rozygosity) of the catalase gene in non-small-cell lung cancer cells [160, 174, 175]; deletion of chromosome 11p, as has been observed in children affected by Wilms tumor, aniridia, gonadoblastoma, and retardation syndrome [176–182], and in later passages of SV40-transformed human fibroblasts [183]. By contrast, increased expression of catalase may be explained by either a gain of catalase gene copy or an amplification of chromosome 11p. Gene amplification is a typical tumor genetic alteration and cancer cells take advantage of this mechanism to overexpress particular genes under stress conditions, such as exposure to cytotoxic drugs or oxidative stress [184]. Indeed, in human HL-60 leukemia and HA1 fibroblast cell lines rendered resistant to H2O2, the enhanced catalase activity correlated with an increase in gene copy number in resistant cells compared to parental cell lines [56, 185]. As previously stated, several single-nucleotide polymorphisms have been detected, and significant correlations with various diseases have been reported [21, 22]. Mutations in catalase protein have been described in acatalasemic patients [21, 22], but no mutations have been detected in the coding sequence, to our knowledge, in patients suffering from cancer. To our knowledge, only one polymorphism correlates with the transcriptional activity of the catalase gene in cancer (Table 2). In the case of C-to-T polymorphism at position 262 from the start of transcription (330 bp upstream of the ATG translation start), the T variant showed greater transcriptional activity in HepG2 and K562 cells [186]. In patient samples, the TT genotype was associated with a higher risk of hepatocellular carcinoma and reduced catalase activity [187]. Conversely, it was shown that CC homozygotes had higher catalase activity compared to those with CT or TT genotypes in breast cancer [188], but this study has been refuted [189]. Table 2 Types of regulation that increase or decrease catalase protein levels Type of regulation/ genetic event Increased catalase protein levels Gene amplification 262 C/T polymorphism (T variant) Posttranscriptional Posttranscriptional (RNA binding factors) Decreased catalase protein levels Loss of heterozygosity Deletion of chromosome 11p 262 C/T polymorphism (T variant) Histone H4 deacetylation DNA hypermethylation Posttranscriptional (RNA binding factors) Phosphorylation of Tyr231 and Tyr386 residues Cell/tumor type Ref. Human H2O2-resistant HL-60 promyelocytic leukemia cell lines Chinese hamster H2O2-resistant HA1 fibroblasts Human red blood cells from individuals Human HepG2 hepatoma and K562 CML cell lines Human breast carcinoma Human H2O2-resistant MCF-7 breast cancer cells Human fibroblasts Rat PC12 pheochromocytoma cells Mouse erythrocytes [56] [185] [186] [186] [189] [196] [197] [198] [199] Human non-small-cell lung carcinoma Red blood cells from WAGR patients WAGR patients Human fibroblasts from WAGR patients Human lymphocytes from WAGR patients Human nephroblastoma patients Human lymphoblasts from WAGR patients Human SV40-transformed fibroblasts Human hepatocellular carcinoma Human breast carcinoma Human doxorubicin-resistant acute myeloid leukemia cell lines Human hepatocellular carcinoma cell lines Human hepatocellular carcinoma Human ARPE-19 retinal pigment epithelial cells Rat hepatoma Human MCF-7 breast cancer cell lines Human embryonic kidney HEK293 cells Mouse embryonic fibroblasts [157, 174, 175] [175] [177, 178] [179] [180] [181] [182] [183] [188] [189] [192] [193] [194] [200] [201] [202] [203] [202] Abbreviations: WAGR, Wilms tumor, aniridia, gonadoblastoma, retardation; SV40, simian virus 40. C. Glorieux et al. / Free Radical Biology and Medicine 87 (2015) 84–97 Fig. 4. Various levels at which the expression of catalase may be regulated. Abbreviations: FoxM1, Forkhead box protein M1; Oct-1, POU domain class 2 transcription factor 1; PPARγ, peroxisome proliferator-activated receptor γ; NF-Y, nuclear factor Y; Sp1, specificity protein 1; FoxO3a, Forkhead box protein O3a; PGC-1α, peroxisome proliferator-activated receptor coactivator 1α; XBP1, X-box-binding protein 1; PI3K, phosphoinositide 3-kinase; Akt, protein kinase B; mTOR, mammalian target of rapamycin; hGH, human growth hormone. 3.2. Epigenetic regulation Gene transcription can be influenced by chromatin modulation [190, 191]. In the case of the catalase gene, little information about the role of epigenetic changes has been reported; however, histone H4 deacetylation and DNA hypermethylation of the catalase gene have been detected in hepatocellular carcinoma and acute myeloid leukemia cell lines (Table 2). In this context, epigenetic changes may regulate catalase expression in acute myelogenous leukemia (AML) cells resistant to doxorubicin (AML-2/DX100), which exhibit lower catalase protein levels compared to their parental cell lines [192]. Inhibition of histone deacetylase activity increased catalase protein levels in AML-2/DX100 cells [192]. As previously reported, specific CpG islands in the human promoters of catalase and Oct-1 were methylated in human hepatocarcinoma cells after H2O2 treatment, which correlated well with decreased catalase expression in this model [155, 193]. Moreover, in liver carcinoma, the catalase promoter is hypermethylated in the tumor itself but not in the neighboring tissues [194]. DNA hypomethylation of the catalase gene is frequently observed in colon tumors, whereas few modifications of DNA methylation are observed in breast adenocarcinomas compared to normal breast tissue [194, 195]. Analysis of the DNA methylation pattern in patient tumor tissues shows that the changes in the levels of DNA methylation occurred only around exon 2 of the catalase gene [195]. 3.3. Posttranscriptional and posttranslational regulations The expression of catalase is also regulated at the RNA level. Unidentified factors may protect or destabilize catalase mRNA. For example, in MCF-7 cells that were rendered resistant to H2O2 and, therefore, overexpressed catalase, delayed degradation of catalase mRNA was observed (82% of catalase mRNA remained 24 h after inhibition of RNA synthesis by actinomycin D in MCF-7/H2O2 vs 32% in MCF7) [196]. The 3′ untranslated region (UTR) of catalase mRNA has T-rich clusters and CA repeats that are susceptible to regulation by unidentified redox-sensitive proteins that bind catalase mRNA and enhance translation [197]. Because the half-life of catalase mRNA is rather long (about 45 h), some unidentified proteins bind to the 93 5′UTR of the catalase mRNA to accelerate its translational rate, as observed in PC12 cancer cells exposed to H2O2[198]. The micro-RNA miR-451 may enhance catalase expression by suppressing protein 14-3-3, an inhibitor of the FoxO3a pathway [199]. Conversely, miR-30b can bind directly to the 3′UTR of the catalase mRNA on a conserved site (Table 2), leading to a drastic decrease in catalase protein levels in ARPE-19 cells (a human retinal pigment epithelial cell line) [200]. Moreover, posttranscriptional regulation of catalase synthesis may be different in healthy compared to tumor tissues. For example, purified normal liver polyribosomes can synthesize catalase, whereas hepatoma polyribosomes cannot [201]. In addition to the previously mentioned regulatory processes involved in catalase expression, the catalase protein itself may also be regulated by posttranslational modifications affecting its levels or its activity. Although this aspect has not been considered in this review, posttranslational modifications, such as phosphorylation and ubiquitinylation of this protein, regulate the turnover and degradation of catalase. Indeed, in human cancer cells exposed to oxidative stress, the tyrosine kinases c-Abl (Abelson murine leukemia viral oncogene homolog 1) and c-Abl-related gene are able to phosphorylate human catalase at residues Tyr231 and Tyr386 (Table 2) [202, 203]. The phosphorylated enzyme is subsequently ubiquitinylated and degraded by the proteasome [202, 203]. Finally, posttranslational modifications, such as phosphorylation (Ser167) [204], glycation [205], and acetylation [206], decrease catalase activity. Conversely, covalent binding of the enzyme to p53 [207] and ataxia telangiectasia mutated [208] proteins induces catalase enzyme activity. Fig. 4 shows a summarized view of the previously discussed levels at which catalase expression may be regulated. The first level is represented by the transactivating activity of transcription factors, their mutual cooperation with coactivators, and the activity of humoral factors. Other levels of regulation are represented by genetic (loss of heterozygosis, gene amplification, and gene polymorphism) and epigenetic (DNA methylation and histone H4 acetylation) processes. Finally, there are posttranscriptional processes (mRNA stability and micro-RNAs) affecting the levels of catalase RNA. 4. Developing strategies to modulate catalase protein levels Altered expression of catalase has been associated with several diseases [21, 22]. In the particular field of cancer pathology, increased and decreased expression of catalase have both been reported. In this context, a large body of evidence indicates that cancer cells are frequently more sensitive to oxidative stress because of their low levels of antioxidant enzymes (catalase, glutathione peroxidase, superoxide dismutase, etc.) [23–35, 39–41]. Given the increasing interest in the development of pro-oxidant therapies, modifying the intracellular redox status of cancer cells by targeting catalase may be an attractive and interesting approach to improve the efficacy of cancer treatments [85, 87]. Indeed, because decreased expression of catalase in cancer cells will lead to increased ROS generation, the use of pro-oxidant drugs may be an efficient alternative to specifically eliminate cancer cells [84–87]. Therefore, understanding the molecular mechanisms that regulate catalase expression may be very important to improve pro-oxidant strategies. For example, the increase in some antioxidant enzymes, such as SOD and catalase, can inhibit tumor cell growth and metastasis [12, 74]. Therefore, targeting PI3K/Akt/mTOR [209, 210] may increase the expression of catalase in tumors and inhibit tumor cell growth. However, the efficiency of these promising anticancer strategies still needs to be proven in vivo and, especially, in human clinical trials. 94 C. Glorieux et al. / Free Radical Biology and Medicine 87 (2015) 84–97 On the other hand, as previously mentioned in the introduction, increased catalase expression has also been observed in tumors [50–53]. Therefore, several approaches looking to decrease both catalase levels and its activities have been developed. For example, because catalase may be located on cancer cell membranes, the use of specific antibodies may inhibit this enzyme in cancer cells and restore their ROS-mediated apoptotic signaling pathways [20]. The use of specific siRNA coupled to nanoparticles is another strategy to decrease catalase protein levels and to induce apoptosis in tumor cells [20]. PPAR antagonists (i.e., LY293111) [211] could be another alternative, in association with pro-oxidant drugs, to decrease catalase protein levels and subsequently increase ROS production in cancer cells to improve their response to chemotherapeutic drugs. Finally, considering the multiple mechanisms involved in the regulation of catalase, an additional method to decrease catalase activity in cancer cells is direct enzyme targeting and the development of new, safe, and specific catalase inhibitors. 5. Conclusions In this review we have shown that the promoter region of mammalian catalases was highly conserved during evolutionary history allowing efficient binding of transcription factors NF-Y, Sp1, and WT1/Egr in the core region. Various other factors, mainly the Fox family members regulated by the Akt/PKB signaling pathway, possess conserved binding sites in vertebrate catalase promoters. 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