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(CANCER RESEARCH 48, 142-147, January 1, 1988] Nonrandom Chromosome Alterations in Human Malignant Mesothelioma1 N. C. Popescu,2 A. P. Chahinian, and J. A. DiPaolo Laboratory of Biology, National Cancer Institute, Bethesda, Maryland 20892 fN. C. P., J.A. D.J, and Department of Neoplastic Diseases, Mount Sinai School of Medicine, New York, New York 10029 [A. P. C.] ABSTRACT Malignant mesothelioma (MM) is a neoplasm closely associated with asbestos exposure, which has been implicated in 70-80% of the cases. In this study, nine MM (two fresh surgical specimens, two permanent cell lines, and five xenografts in nude mice) were examined cytogenetically. Six patients had a known history of asbestos exposure. Seven MM were chromosomally abnormal, the majority having complex structural alterations affecting different chromosomes, whereas two fresh surgical specimens had a normal chromosome constitution. Alterations of chro mosome 3 were detected in seven cases and changes involving chromo somes 1 and 7 were observed in six cases. The breakpoints of transloca tions and deletions on chromosome 1 involved several bands; however, 50% of the breakpoints were near the locations of Blym, L-myc, and ski protooncogenes. Forty % of the breaks on chromosome 7 involved bands ql 1.1-11.2 and 20% were at q22, the location of the met protooncogene. Nonrandom changes on chromosome 3 were interstitial or terminal deletions, and translocations involving the region pl4-21. The deleted 3p segment was identifiable as part of a chromosome translocation in one MM and was apparently lost in the other six. The deletions involving 3p are either spontaneous or asbestos-induced lesions at vulnerable genomic sites and are the most common and nonrandom chromosome alterations observed. Possibly 3p abnormalities are causally related to the develop ment of this malignancy. INTRODUCTION Specific chromosome alterations have been demonstrated in several forms of human cancer (1). The breakpoints in various chromosome rearrangements in cancer have been found to affect a surprisingly limited number of locations and frequently occur at sites of cellular protooncogenes (2, 3). Furthermore, a recent statistical analysis showed that the location of 19 of the 26 protooncogenes correspond to one of the 83 bands involved in primary cancer-specific rearrangements (4). Protooncogenes can be transposed due to chromosome rearrangements to a new location near enhancing or promoter sequences causing changes in protooncogene regulation (5, 6). Burkitt's lymphoma, reports certain chromosomes were more frequently involved in alterations, but nonrandom changes were not reported. In the present study the chromosome constitution of nine MM from untreated patients, 6 with known exposures to as bestos, were analyzed. Seven tumors had chromosomally ab normal clones with varying degrees of complexity in terms of structural or numerical alterations. Alterations of chromosomes 1, 3, and 7 were the most frequently observed changes. Nonran dom deletions involving the short arm of chromosome 3 (pi421) were identified in seven cases. Possibly this alteration plays an important role in the development of MM. MATERIALS AND METHODS After surgical removal, pieces from tumors diagnosed histologically as MM were placed into RPMI 1640 containing fetal bovine serum until processed for culturing; similarly, MM transplanted into nude mice were surgically removed and immersed in medium with serum. The tumor was minced into small pieces and digested with 0.07% collagenase for 12 h at 37°Cin a 5% CO2 atmosphere. The suspension was centrifuged, the cells were washed twice with Hanks' balanced salt solution, and plated in RPMI 1640 supplemented with 10% fetal calf serum. When confluent, cultures were subcultured, and 24 or 48 h later exponentially growing cultures were used for chromosome prepara tions. Cultures from established cell lines were subcultured 1:4 and used 24 h later for chromosome preparation. Colcemid (2 x IO7M) was added 4-12 h before harvesting. The cells were mechanically detached from the surface of dishes and exposed to 0.075 M KC1 for 15-20 min. The cells were fixed with a 3:1 mixture of methanohacetic acid; the fixative was changed three times before making slides. To obtain Gbanding, the chromosome preparations were stained with Giemsa or Wright stain after trypsin pretreatment. Other slides were processed for C-banding. For each case 100 conventionally stained metaphases were counted and at least 25 G-banded karyotypes were examined. RESULTS The MM examined included two established cell lines, five tumors which had been serially transplanted into nude mice, and two fresh surgical specimens (Table 1). The cell morphol ogy in culture corresponded to the histológica! type of the tumor, being epithelial or fibrosarcomatous, or a mixture of both cell types (Table 1). Cultures derived from transplanted tumors had variable proportions (5-25%) of host stremai cells, independent of the number of passages in nude mice. Tumors transplanted into nude mice preserved the same chromosome constitutions after extended periods of transplantation as evi denced by sequential chromosome analysis. For example, one rising, primarily due to widespread exposure to asbestos which tumor (BG) has the same chromosome constitution after more has been implicated in 70-80% of the patients with this disease. than 7 years of serial transplantation in nude mice (11). Simi Compared to many other forms of cancer, only a small number larly, one established cell line (JMN) exhibited the same modal of MM have been cytogenetically examined (7-10). In these chromosome number after 100 passages in culture (12). The MM examined had either near diploid or near triploid Received 7/9/87; revised 9/22/87; accepted 9/28/87. The costs of publication of this article were defrayed in part by the payment chromosome numbers. Seven tumors were chromosomally ab of page charges. This article must therefore be hereby marked advertisement in normal with both structural and numerical alterations and two accordance with 18 U.S.C. Section 1734 solely to indicate this fact. ' This investigation was supported in part by Grant CA 36283 awarded [to tumors had a normal karyotype (Table 2). The most frequent A.P.C.] by the National Cancer Institute, Department of Health and Human numerical deviations were gain of chromosome 3s in four Services, Bethesda, M D 20892. 1To whom requests for reprints should be addressed. tumors (DND, EH, MC, and ES) and losses of chromosome 4s 3The abbreviation used is: MM, malignant mesothelioma(s). in three tumors (DND, BG, and ES) (Table 2). One or two X 142 chronic myelogenous leukemia, and acute promyelocytic leu kemia are among the best characterized examples of malignan cies with specific reciprocal translocations involving protoon cogenes important for the control of cell growth and tumorigenesis (5, 6). With certain exceptions, chromosome alterations in solid tumors are very complex compared to those in hematological malignancies (1). The complexity of these changes may obscure primary changes involved in the process of neoplastic development. MM3 is a neoplasia of growing concern. Its incidence is Downloaded from cancerres.aacrjournals.org on June 18, 2017. © 1988 American Association for Cancer Research. CHROMOSOME ABNORMALITIES Table 1 Origin and morphological characteristics IN MM of malignant mesotheliomas in nude typeEpithelialEpithelialBiphasicEpithelialFibrosar Age exposure5759 mice1,666, CaseJMN*DND*EHCVS*MC*BGrES*FM"KT*OriginAscitesAscitesPleuraltumorPleuraltumorPleuraltumorPleuraltumorPleuraltumorChest +63 +6667 +4456 1148.5058Cell" +57 pre dominantlyepithelialEpithelialBiphasic wallmassPleuraltumorSexMMMFMFMMMAsbestos +63 +Passage " Biphasic denotes a mixture of epithelial and fibrosarcomatous cells. * Established cell lines were analyzed for chromosomes at culture passage 96-100. c MM transplanted into nude mice. 'Fresh surgical specimens analyzed at culture passage 1-2 (4-10 days in culture). Table 2 Cylogenetic data of malignant mesotheliomas Chromosome' Case" Range* Modal no. Gain Loss Structural abnormalities'' i(dup(5)(pl4-15.3))dup(5)(pl4-15.3)del(7)(q 1) del(3)(p21q21) 3)del( 11.2) del 9(p 13) del( 12)(p?) t(6; 12) (p 11.2;p 1 4.5,812,15,173,19,12 10,14,16,22,15,del(l)(pl der(7).t(7;HSR 1)(q2 1q23) del(3)(p 14p2 1. 1)(q23) i(3p)del(p 14p2 1) 1.1)der( ?)(pl5;?) del(7)(q22) der(8), t(l;8)(ql l;ql 11.2)der(18),t(?;18)(?;q21) 11)t(8; 11)(q2 1.2;q23) del( 17)(p i(Xp)del(l)(p32) 19103 del(7)(q22)del(l)(ql2) del(3)(pl4) der(4).t(4;?)(q33;?)der(7),t(7;15)(ql del(3)(pl4) del(3)(ql3.1) del(7)(q32)der(l).t(l;7)(p22;q22) l.l;ql 1.2) del(4)(q33)der(5),t(l;5)(q23;q31) dir ins(3;?)(p21;?) 8,21,X4, der(7),t(l;7)(p;q22)der(7),t(7; t(6;?)(q25;?) 11.2)del(12)(pll.2)t(13;?)del(17)(pll.2)del(l)(p22) 11)(q 11.2q 13) der(7).t( 1;7)(p22; 11.2) del( 10)(p 123,19 20, X JMNDNDEHVSMCBG48-5265-7670-7844-4671-7541-435172754574425, 13,22, X, ES 71-77 73 4,6,14 der(3),t(l;3)(p32;p21)der(7)t(7;12)(pl t(l;?)(p31;?) 1.2;?)der(10),t(l?;HSR?:10)(p32;q36) 1.2;ql3) i(7p) t(7;?)(pl 11? derl2,t(2:12)(q32;q24.3) i(lq) der(3).t(3;10)(p21;ql 1.2) del(3)(pl4p21) t(3;?;5)(qll.2;?;ql3)der(3),t(3;?)(q21;?) der(4),t(4;l I)(q25;ql3) t(5;?)(q35;?) del(8)(p23) der( 11),t(4; 11)(q25;q 13) t( 17)(q;?) inv(9)(pl2ql2) 46-48 FM 46 45-46 KT 46 " Origin of each tumor is shown in Table 1. 'Chromosome number was determined in 100 conventionally stained metaphases. ' Chromosome gain and loss relative to the ploidy level. d A minimum of 25 G-banded karyotypes was examined. Variable numers (2-10) of unidentified chromosome markers were also present. chromosomes were missing in two tumors (MC and BG) (Table 2), and tumor cell line JMN had a supernumerary X chromo some (Table 2). G-banding analysis showed structural clonal alterations of marked diversity (Table 2); however, structural alterations involving chromosomes 1, 3, and 7 were most fre quently observed. Changes of chromosomes 1 and 7 were iden tified in six cases and alterations of chromosome 3 in seven cases (Table 2). Alterations of chromosome 1 included terminal deletions of both the short and long arms, translocations, and in two tumors an isochromosome, Iq was present (Table 2). The breakpoints of deletions occurred at different bands on the short and long arms. However, 50% of the breakpoints affected the regions p22 and p32 (Table 2). Alterations of chromosome 7 involved deletions and unbalanced translocations with differ ent chromosomes (Table 2). The breakpoints on chromosome 7 occurred at bands ql 1.1-11.2 and q22; 80% of the breakpoints identified involved these sites (Table 2). The BG tumor had an increased number of 7p copies due to the presence of an isochromosome 7p (Fig. 1), and DND cell line had a translo cation involving 7p that may contain a homogeneously staining region (HSR) (Fig. 2). Deletions of the short arm of chromosome 3 were identified in seven cases (Table 2). The 3p deletions were either interstitial (Fig. 2) or terminal (Fig. 3) and occurred at bands 3p 14-21. Interstitial deletions were observed in two cases and terminal deletions in five cases were at or above band 3pl4 (Fig. 2). The entire deleted segment was translocated to another chromo some in only one tumor, whereas in the remaining cases the deleted segment was apparently lost. In MC tumor an insertional translocation was identified at 3p 14-21 (Fig. 4). Repre sentative deletions and translocations are shown in Fig. 5. The most frequently represented breakpoint on 3p occurred at band p21 (62%) followed by pl4 (31%) and pl3 (7%). The break points identified on 3q occurred randomly along the whole arm. In addition, one tumor (BG) exhibited a large unidentified abnormal chromosome, with a banding pattern suggestive of a 143 Downloaded from cancerres.aacrjournals.org on June 18, 2017. © 1988 American Association for Cancer Research. CHROMOSOME ABNORMALITIES IN MM V Fig. 1. Karyotype of a hypodiploid cell from BG tumor transplanted into nude mice. Although the tumor was derived from a female patient, only one X chromosome was present. No normal chromosomes 3 were observed; an abnormal chromosome resulted from a translocation between chromosomes 1 and 3. A large abnormal metacentric had a banding pat tern suggestive of involvement of chromosome 3 and exhibited positive C-band staining on both arms (inset) indicative of a complex re arrangement. Four copies of 7p are present. Arrows, abnormal chromosomes. ii ifiV li i i u ì U v* *• * 3 ft 15 13 14 19 n l 20 16 17 21 22 ¡uM'I * um 10-- 1» 13 r -B 19 è1 it fil 14 15 18 I X I) i P» M !!» ~r ÕÕ 11 12 «;v 21 20 % s** »•MM 16 l* 17 51 22 18 ü« X Y « A M1 rearrangement (Fig. 1). li M1 m KMtÃ-; Fig. 2. Karyotype of a near-triploid cell with 71 chromosomes from DND cell line: arrows indicate abnormal chromosomes. Of six copies of chromosome 3, only one appeared normal. The others had either interstitial dele tions of the short arm (pi4-21) or a terminal deletion of the long arm. An abnormal chro mosome 7 may exhibit a homogeneously stain ing region on the short arm. MI-MS are uni dentified chromosome markers. 12 11 involving at least a portion of chromosome M5 3 (p 14-21) identified in seven cases may represent a common alteration in MM. From a total of 27 cases of MM cytogenetically characterized by banding which include the present ones, six had a normal diploid constitution, one had a mixture of normal and abnormal cells (10), whereas the rest were chromosomally abnormal. Fifteen of these MM had abnormalities of 3p consisting mainly of terminal deletions (7-10). In addi tion, two out of three unpublished cases also exhibit 3p dele tions.4 3 DISCUSSION Analysis of nine MM demonstrates that the majority of these tumors have numerical deviations and complex structural alter ations involving various chromosomes. Despite this karyotypic complexity, structural alterations of chromosomes 1, 3, and 7 were most frequent, and nonrandom deletions of chromosome 4J. Wang-Peng, personal communication. 144 Downloaded from cancerres.aacrjournals.org on June 18, 2017. © 1988 American Association for Cancer Research. CHROMOSOME ABNORMALITIES IN MM H U! Fig. 3. Karyotype of a hypodiploid cell from the cell line JMN. Several abnormal chromosomes, including a small metacentric originating from deletions of both arms of chromosome 3 are indicated by arrows. Ml and A/2 are unidentified chromosome markers. Arrows, abnormal chromosomes. Ci Hl U IM it 13 :i 10 1* 14 15 16 12 11 J • «« •* 17 ».18 »v Ãi * 19 20 i 21 .. li 22 XX i »to' U M1 M2 * Fig. 4. Karyotype of a near-triploid cell with 74 chromosomes from tumor MC trans planted into nude mice. An insertional translocation on the short arm of two chromosomes 3 is indicated by arrows. Arrows, abnormal chromosomes. MI-MS are unidentified chro mosome markers. „ **«*u ¡as«UM -" " ftUA 15 HZ** i f 12 16 17 18 *« 21 20 19 11 fcift 14 13 10 a ft 22 «è Y ' M1 - -M5 Asbestos exposure and possibly genetic susceptibility are major contributing factors in the development of MM (13-15). Nonrandom deletions at 3p may be a reflection of both factors. Over 90% of the breaks on 3p involved bands p21 and p 14. The breakage point at pl4 corresponds with the location of an inducible constitutive fragile site (16, 17) and a region suscep tible to spontaneous chromosome breakage (18). Chromosomal fragile site at 3pl4 may have existed in the normal cells of the patients and were expressed on MM as terminal or interstitial deletions. Six of the MM examined were derived from patients with known history of asbestos exposure. Conceivably, exposure to asbestos fibers may have induced the damage at 3p. In Chinese hamster cells, asbestos exposure elevated the frequency of sister chroma) id exchanges, particularly on the larger chro- 145 Downloaded from cancerres.aacrjournals.org on June 18, 2017. © 1988 American Association for Cancer Research. CHROMOSOME ABNORMALITIES IN MM exhibit specific interstitial deletions on chromosomes 13 and 11, respectively (34-36). An alternative mechanism may involve the transposition of c-ra/protooncogene to an aberrant location resulting in structural or functional gene alterations relevant to the neoplastic development. In situ hybridization analysis of two renal cell carcinomas demonstrated that c-ra/gene shifted from 3p25, its normal location (37), to 3pl4 due to an appar ently terminal 3p deletion (38). The involvement of this protooncogene was described in small cell carcinoma of the lung with terminal 3p deletions (39, 40). A relatively large number of hematological malignancies and solid tumors have deletions at 3p 14-21 (41-54). In MM and other neoplasms with 3p deletions, the deleted material is infrequently translocated to another chromosome. The inser tional translocation identified in one of these MM (MC) is similar to that described in certain cases of retinoblastoma (55, 56) and Wilms' tumor (57). The molecular alteration caused by ! ( Deletions Normal I I Translocations Fig. 5. Deletions and translocations of chromosome 3 identified in seven cases of malignant mesotheliomas. The first and the second chromosome in the upper row have interstitial deletions at bands p21 and p 14. respectively. The third chromosome has a terminal deletion at band p 14. whereas the fourth is deleted on both arms at p2l and q21. In the lower row. the Tirsi abnormal chromosome has an insertional translocation al band p21. the second is a translocation 1;3 (p32;p21), and the third chromosome is a translocation 3:10 (p2l;ql 1.2). the deletion on chromosome 3 is not known in any form of cancer, however. Whether or not there is a common site of damage or intraspccific breakage site within 3p 14-21 for each cancer type will require molecular analysis with appropriate DNA probes. mosomes (19), and induced extensive chromosome aberrations (20). In nontumorigenic Syrian hamster cell lines obtained after asbestos treatment, a nonrandom trisomy 11 was reported (21). However, this alteration has been identified in cells transformed by other carcinogens (22, 23). In vitro exposure of human mesothelial cells to asbestos caused the formation of abnormal chromosomes (24), and in our opinion some of these abnormal chromosomes involved chromosome 3. Involvement of chromosomes 1 and 7 may also be common in MM. Changes of chromosome 1 were reported in eight other cases of MM (9, 10). Alterations of this chromosome are generally dissimilar (9) and may reflect events associated with the progression of malignancy (9). However, in this series of MM, several breakpoints on chromosome 1 were close to the location ofBlym, (25), L-iwyc (26), or Ski (27) protooncogenes. Partial or complete trisomy of Iq initially demonstrated in patients with myeloproliferative disorders (28) were subse quently identified in a variety of malignancies (29). Trisomy Iq occurred in two cases of the MM examined as a result of the formation of an isochromosome Iq. Because chromosome 1 carries several protooncogenes, there is a possibility that im balance of chromosome 1 arms may be critical for oncogene dosage in certain neoplasias (6). The majority of the breakpoints on chromosome 7 clustered at bands ql 1.1-11.2 at the site of a human ra/-related gene (30). Several breaks occurred at q22 which includes the region 7q21-31, the location of the met protooncogene (31). In three cases the short arm of chromosome 17 at band 11.2 rather distant from the P53 gene was also affected (32). Different types of chromosome 17 alterations have been reported in five other cases of MM (9, 10). In two cases, deletions of chromo some 12pl 1 near the site of K-ras-2 protooncogene (33) were also identified. Although no protooncogene had been localized at the critical sites of breakage on 3p, it is possible that the genetic damage at these sites represents an important event but not necessarily a unique alteration responsible for the development of MM. The region 3p 14-21 may contain one or more suppressor genes that once deleted unleash the expression of malignancy. This model could be similar to the recessive acting effect implicated in the development of retinoblastoma and Wilms' tumors which ACKNOWLEDGMENTS We thank Dr. A. Behbehani and Dr. T. Ohnuma for providing JMN and DND mesothelioma cell lines, respectively. REFERENCES 1. Sandberg, A. A. The Chromosomes in Human Cancer and Leukemia. New York: Elsevier/North Holland, 1980. 2. Mitelman, F. 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Nonrandom Chromosome Alterations in Human Malignant Mesothelioma N. C. Popescu, A. P. Chahinian and J. A. DiPaolo Cancer Res 1988;48:142-147. Updated version E-mail alerts Reprints and Subscriptions Permissions Access the most recent version of this article at: http://cancerres.aacrjournals.org/content/48/1/142 Sign up to receive free email-alerts related to this article or journal. To order reprints of this article or to subscribe to the journal, contact the AACR Publications Department at [email protected]. To request permission to re-use all or part of this article, contact the AACR Publications Department at [email protected]. Downloaded from cancerres.aacrjournals.org on June 18, 2017. © 1988 American Association for Cancer Research.