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Review 417 Wine and resveratrol: mechanisms of cancer prevention? F Bianchini and H Vainio Low alcohol consumption seems to decrease total mortality and to have beneficial properties on cardiovascular disease; data for cancer are still inconclusive. There is evidence that wine consumption decreases the risk of cancer at several sites, including cancer of upper digestive tract, lung, colon, basal cell carcinoma, and non-Hodgkin lymphoma. The presence of resveratrol, a polyphenol specifically present in red wine, may contribute to these cancer preventive effects. Resveratrol in fact inhibits the metabolic activation of carcinogens, has antioxidant and anti-inflammatory properties, decreases cell proliferation and induces apoptosis. Data on the availability of resveratrol in vivo are however still lacking. Although regular consumption of one or two glasses of wine seems reasonably safe from the health point of view, a recom- Introduction It has been estimated that 3% of all cancer deaths in the USA can be attributed to alcohol consumption (Doll and Peto, 1981). Alcoholic beverages have been classified as carcinogenic to humans (Group 1) by the International Agency for Research on Cancer (IARC, 1988). Alcohol consumption is also known to be positively associated with several other diseases, including cardiovascular disease, stroke, gastric and duodenal ulcers, liver cirrhosis and pancreatitis. However, evidence is accumulating that drinking low to moderate amount of alcohol (1–2 drinks/ day) might also have beneficial effects. In the present paper we briefly summarize, although not exhaustively, most of the epidemiological literature on possible cancer-preventive effects of moderate consumption of alcohol, and discuss possible responsible biological mechanisms. mendation to the general population for low wine consumption is not justified. European Journal of Cancer c 2003 Lippincott Williams & Prevention 12:417–425 Wilkins. European Journal of Cancer Prevention 2003, 12:417–425 Key words: Alcohol, cancer prevention, resveratrol, wine International Agency for Research on Cancer, Unit of Chemoprevention, 150 Cours Albert Thomas, 69372 Lyon Cedex 08, France. Correspondence to: F Bianchini. Fax: ( + 33) 4 72 73 83 19. E-mail: [email protected] Received 27 March 2003 Accepted 6 June 2003 drinks per week; RR = 0.83) and moderate drinkers (5– 29.9 g alcohol per day, corresponding to 3–15 drinks per week; RR = 0.88), mainly due to a decrease of deaths from cardiovascular disease (Fuchs et al., 1995). A previous follow-up had also shown that mortality from ischaemic stroke was lowest when consuming 5–24.9 g alcohol per day; in contrast, a strong increase of mortality from haemorrhagic stroke was observed for the same consumption of alcohol (Stampfer et al., 1988). Low to moderate consumption of alcohol also reduced the risk of ischaemic stroke, angina and myocardial infarction in US male physicians while no significant effect was observed for haemorrhagic stroke (Camargo et al., 1997; Berger et al., 1999; Mukamal et al., 2003). Several other studies have demonstrated a negative association between moderate alcohol consumption and coronary heart disease (Yano et al., 1977; Boffetta and Garfinkel, 1990; Rimm et al., 1991). Alcohol consumption and cancer risk Total alcohol consumption and overall mortality The presence of a J-shaped relationship (i.e., the relationship is not linear at low doses and the lower value of relative risk (RR) does not correspond to the lowest consumption) between alcohol consumption and total mortality has been well documented. For example, in a meta-analysis of 16 cohort studies the lowest mortality for all causes was observed for men consuming 1–2 drinks per day and for women consuming less than one drink per day (Holman et al., 1996). In the Nurses Health Study in the USA, total mortality was lower in light (1.5–4.9 g alcohol per day, corresponding to 1–3 c 2003 Lippincott Williams & Wilkins 0959-8278 Data on possible beneficial effects of moderate consumption of total alcohol on cancer development are less convincing. In a cohort study among middle-aged Japanese men the lowest risk of mortality from all causes and from cancer was observed in those consuming 1–149 g alcohol per week (1–2 drinks per day) (Tsugane et al., 1999). The effect was significant only in non-smokers, although the trend was similar for smokers. Nevertheless, some meta-analyses have shown an increase of the risk of breast and colon cancer with consumption of one and two drinks per day, respectively (Longnecker et al., 1990; Longnecker, 1994). Thus, a meta-analysis by Corrao et al. (1999) showed that even 25 g alcohol per day DOI: 10.1097/01.cej.0000090185.08740.59 Copyright © Lippincott Williams & Wilkins. Unauthorized reproduction of this article is prohibited. 418 European Journal of Cancer Prevention 2003, Vol 12 No 5 (corresponding to about two drinks or two glasses of wine), increased approximately two-fold the risk of cancers of the upper aerodigestive tract and was associated with a weaker but significant increase in colorectal and breast cancers. This meta-analysis, however, was based on a small number of studies due to strict inclusion criteria, and there was a strong evidence of heterogeneity across studies. A large prospective study of mortality among US adults showed that even one drink per day increased the risk of death for cancer of the upper aerodigestive tract and liver in men, and cancer of the breast in women; no effect was reported for colon in either gender (Thun et al., 1997). In the Framingham Study, a follow-up of more than 40 years showed that consumption of alcohol up to 15 g per day was not associated with an increase of breast cancer risk (RR = 0.7, 95% C.I. = 0.5–1.1) (Zhang et al., 1999). Finally, a pooled analysis of six prospective studies with at least 200 incident breast cancer cases showed that the risk increased linearly with increasing intake up to 60 g alcohol per day (approximately four drinks), although the increase in risk was not significant below 30 g alcohol per day (Smith-Warner et al., 1998). Differential effects by specific beverages Differential effects of specific alcoholic beverages have been hypothesized. Renaud et al. (1998) evaluated the effect of alcohol consumption on mortality in a prospective study on 34 000 middle-aged men from eastern France. The lowest total mortality (RR = 0.7), mortality from cardiovascular disease (RR = 0.65) and mortality from cancer (RR about 0.8) was observed for 22–32 g alcohol per day. The proportional decrease in total mortality was similar for smokers, non-smokers and exsmokers. As wine represented around 82% of alcohol intake in this cohort, the observed effects were attributed to wine consumption (2–5 drinks per day); however, only a few subjects were exclusively wine drinkers, so that possible protective effect of other alcoholic beverages could not be excluded. Results provided so far are still inconsistent and some meta-analysis and systematic reviews have not supported a preferential effect of small doses of wine compared with other alcoholic beverages in the reduction of mortality from coronary heart disease and myocardial infarction (Rimm et al., 1996; Cleophas, 1999; Mukamal et al., 2003). A few cohort studies have analysed the preferential effect of low intake of different beverages on cancer risk (Table 1). A pooled cohort study in Denmark reported that light drinkers (8–21 drinks per week) had lower mortality from all cause or from coronary heart disease, but no changes in cancer risk (Grønbæk et al., 2000). When individual beverages were considered, light consumption (8–21 drinks per week) of beer and spirit had no effect on total mortality, decreased the risk of coronary heart disease and slightly increased the risk of cancer; in contrast, similar consumption of wine decreased not only the mortality from coronary heart disease, but also mortality from all causes and from cancer. When data were stratified for wine drinkers and non-wine drinkers, wine drinkers had a lower risk of death from coronary heart disease and cancer at all levels of total alcohol intake; however, the observed RR for wine drinkers was always lower than one for coronary heart disease but became higher than one for cancer when the daily consumption was more than three drinks per day. In the same-pooled cohort study the relative risk for specific cancer sites was also estimated. The risk of lung cancer in men was much decreased by consumption of over 13 drinks of wine per week (RR = 0.44), while consumption of corresponding amounts of beer and spirits increased the risk (Prescott et al., 1999). In the same cohort in Denmark consumption of seven or more drinks of beer or spirits per week significantly increased the risk of cancer of the upper digestive tract, while the same consumption of wine gave a relative risk of 0.4 (0.2–0.8) (Grønbæk et al., 1998). Thus, when the proportion of wine in total alcohol intake was over 30%, consumption of seven to 21 drinks per week was associated with a relative risk of 0.5 while subjects who drank the same amount of alcohol but no wine had a relative risk of three. A prospective study in Canada reported that 10–20 g alcohol per day was associated with a slight increase in mortality from breast cancer; this increase was mainly limited to consumption of wine (Jain et al., 2000). No major increase was observed with less than 10 g wine per day (RR = 1.05). In the Framingham Study, in the USA, the risk of breast cancer was not significantly associated to consumption of wine, beer or spirit (Zhang et al., 1999). The Pooling Project of Prospective Cohort Studies in the USA reported approximately a 10% increase of breast cancer risk by each daily increase of 10 g alcohol; the effect of wine was not significant (RR = 1.05; CI, 0.98– 1.12), although similar to that of beer (RR = 1.11) and spirits (RR = 1.05) (Smith-Warner et al., 1998). Consumption of red wine tends to decrease the risk of basal cell carcinoma in women (P = 0.004), but not in men (Fung et al., 2002), while consumption of spirits increased the risk, although not significantly. A possible, preferential effect of wine on cancer risk was less evident when assessed in case-control studies (Table 2). Low consumption of wine (but not beer and/or spirits) reduced by about 60% the risk of non-Hodgkin’s lymphoma (Briggs et al., 2002), and by 40–50% the risk of adenocarcinoma of the oesophagus and gastric cardia (Gammon et al., 1997). However, several other studies did not show any association between wine drinking and risk of cancers of the endometrium, colorectum and adenocarcinoma of the oesophagus. Regarding breast cancer, risk was increased in pre-menopausal women consuming Copyright © Lippincott Williams & Wilkins. Unauthorized reproduction of this article is prohibited. Table 1 Cancer incidence and low alcohol consumption. Cohort studies Endpoint Study, country Population No of cases Alcohol intake Relative riska ( ± 95% confidence interval) Reference Grønbæk et al., 2000 Adjustment Pooled cohort studies, Denmark Men and women aged 20–98 1552 8–21 drinks/week 0.78 (0.64–0.96) wine 1.32 (1.12–1.55) beer 1.13 (0.93–1.38) spirits Incidence of lung cancer Pooled cohort studies, Denmark Men and women aged Z 20 674 > 13 drinks/week Wine: Prescott et al., 1999 Men 0.44 (0.22–0.86) Women 0.18 (0.03–1.33) Beer: Men 1.36 (1.02–1.82) Women 1.49 (0.70–3.13) Spirits: Men 1.46 (0.99–2.14) Women 0.67 (0.21–2.18) Age, study cohort, smoking, education Incidence of upper aerodigestive tract cancer Pooled cohort studies, Denmark Men and women aged 20–98 156 Z 7 drinks/week 0.4 (0.2–0.8) wine 2.9 (1.8–4.8) beer 1.5 (1.2–1.9) spirits Grønbæk et al., 1998 Age, study cohort, smoking, education Death for breast cancer National Breast Screening Study, Canada Women aged 40–59 223 0– r 10 g/day 1.05 (1.02–1.07) wine 1.04 (1.02–1.07) beer 0.97 (0.96–0.99) spirits Jain et al., 2000 Age at enrolment, reproductive factors, family history, smoking, education, mammography, breast self examination, BMI, energy intake Incidence of breast cancer Framingham Study, USA Women aged 28–62 (original cohort) and aged 12–60 (offspring cohort) 287 1– < 3 drinks/week 0.7 (0.4–1.3) wine 1.0 (0.5–1.7) beer 0.7 (0.5–1.3) spirits Zhang et al., 1999 Education, height, BMI, physical activity, reproductive factors, smoking, HRT, other alcoholic beverages Incidence of breast cancer Pooled analysis of 6 cohort studies, USA Women aged 34–76 (total range) 4335 Daily increases of 10 g alcohol 1.05 (0.98–1.12) wine 1.11 (1.04–1.19) beer 1.05 (1.01–1.10) spirits Smith-Warner et al., 1998 Not specified Incidence of basal cell carcinoma Nurses Health Study, USA Women aged 30–55 3060 Z 15 g/day Health Professionals Follow-up Study, USA Men aged 40–75 3028 0.56 (0.29–1.08) red wine Fung et al., 2002 1.05 (0.54–2.04) beer 1.31 (0.95–1.80) spirits Age, sex, smoking, education, BMI, physical activity, other alcoholic beverages Age, residence, BMI, smoking, sun exposure, sunscreen use, total calories, other alcoholic beverages 1.00 (0.67–1.49) red wine 1.00 (0.72–1.38) beer 1.11 (0.94–1.31) spirits a Abstainers represent the reference category; the RR reported here corresponds to the higher degree of adjustments for confounding. Abbreviations: BMI, body mass index; HRT, hormone replacement therapy. Copyright © Lippincott Williams & Wilkins. Unauthorized reproduction of this article is prohibited. Wine and cancer Bianchini and Vainio 419 Death for cancer Cancer incidence and low alcohol consumption. Case-control studiesa Endpoint Study, country Population No of cases Alcohol intake Relative riskb ( ± 95% confidence interval) Reference Adjustment Incidence of non-Hodgkin lymphoma Population-based, USA Men from 8 cancer registries, aged 32–60 960 Z 1 drink/day 1–2 drinks/day 1–2 drinks/day 0.4 (0.2–0.9) wine 1.2 (0.8–1.7) beer 1.1 (0.7–1.8) spirits Briggs et al., 2002 Age, ethnicity, cancer registry, smoking, education, other alcoholic beverages Incidence of adenocarcinoma of the esophagus Population-based, USA Men and women from 3 geographical areas, aged 30–79 554 4–7 drinks/week 5–12 drinks/week 5–14 drinks/week 0.6 (0.4–0.9) wine 0.6 (0.3–0.9) beer 1.2 (0.8–1.9) spirits Gammon et al., 1997 Age, sex, centre, race, BMI, income, smoking, other alcoholic beverages Incidence of adenocarcinoma of the esophagus Population-based, USA Men from 3 centers 174 3–13 drinks/week 8–14 drinks/week 8–14 drinks/week 0.8 (0.4–1.5) wine 0.7 (0.4–1.2) beer 1.8 (1.0–3.2) spirits Brown et al., 1994 Age, area, income, smoking, other alcoholic beverages Incidence of breast cancer Selected controls, France Population-based, USA Premenopausal women aged 30–50 Women (pre- and post-menopausal) 154 4 l/month 1 l/month Z 28 drinks/month 1.52 (0.88–2.63) red wine Viel et al., 1997 1.43 (0.62–3.33) beer 0.8 (0.51–1.25) wine Freudenheim et al., 1995 1.37 (0.83–2.25) beer 0.84 (0.52–1.38) spirits Population-based, Spain Women aged 18–75 762 Hospital-based, Italy Women aged 26–74 437 0.7–5.12 g/day 0.8–3.3 g/day 0.5–1.4 g/day r 3 drinks/day yes vs. no yes vs. no 1.0 (0.8–1.4) wine 1.2 (0.9–1.7) beer 1.0 (0.6–1.7) spirits 1.16 (0.85–1.59) wine 1.32 (0.82–2.13) beer 1.44 (0.92–2.23) spirits Hospital-based, France Women (mean age 58) 500 < 80 g/week < 80 g/week < 10 g/week 1.19 (P for trend = 0.02) wine 1.29 (P for trend = 0.02) beer 0.86 (N.S.) spirits Incidence of endometrial cancer Hospital-based, Italy Women aged 28–74 726 > 0– r 1 drinks/day yes vs. no yes vs. no 1.1 (0.9–1.4) wine 0.7 (0.5–1.1) beer 1.6 (1.1–2.2) spirits Parazzini et al., 1995 Age, education, BMI, smoking, reproductive factors, HRT, diabetes, hypertension, other alcoholic beverages Incidence of colorectal cancer Population-based, Sweden Men and women > 40 569 1.0–9.9 g/day 0.9 (0.6–1.1) wine 0.9 (0.7–1.2) beer 1.0 (0.6–1.7) spirits Gerhardsson de Verdier et al., 1993 Age, sex, BMI, energy intake, smoking, physical activity 740 Caloric intake, parity Age, education, reproductive factors, family history, BMI, caloric intake, other alcoholic beverages. Martin-Moreno et al., 1993 Age, region, SES, BMI, family history, reproductive factors, energy intake La Vecchia et al., 1985 Age, education, smoking, reproductive factors, BMI, smoking, HRT, other alcoholic beverages Lê et al., 1984 Reproductive factors, history, SES, other alcoholic beverages a Only studies considering at least three categories of wine consumption are reported. Abstainers represent the reference category; the RR reported here corresponds to the higher degree of adjustments for confounding. Abbreviations: BMI, body mass index; HRT, hormone replacement therapy; SES, socioeconomic status. b Copyright © Lippincott Williams & Wilkins. Unauthorized reproduction of this article is prohibited. 420 European Journal of Cancer Prevention 2003, Vol 12 No 5 Table 2 Wine and cancer Bianchini and Vainio 421 4 litres of red wine per month, corresponding to approximately one drink per day (RR = 1.52; CI, 0.88– 2.63) (Viel et al., 1997) and in women consuming less than 80 g wine per week (P for trend, 0.02) (Lê et al., 1984). Other studies showed that wine did not increase the risk of breast cancer (Freudenheim et al., 1995; MartinMoreno et al., 1993). Altogether, these studies lack consistencies in identifying a specific beverage as more beneficial in cancer prevention. It is possible that the beverage more widely consumed in a country would result in a stronger beneficial effect in such population, also because this is related to other lifestyle factors (Rimm, 1996). Nevertheless, there is suggestion of a J-shaped association between low consumption of wine with cancer, although it does not provide any proof of causality. These epidemiological studies may suffer from selection bias, including the presence of former drinkers in the group of abstainers, or the prevalence of higher morbidity among abstainers at baseline. Current instead of past consumption of alcohol has sometimes been recorded and residual confounding could also explain the effect. For example, it is possible that a preferential consumption of wine, compared with other beverages, might be confounded by lifestyle factors, including diet and smoking, by social class, or by a different drinking pattern. Wine is consumed particularly in combination with a Mediterranean diet, where fruits and vegetables (putative protective factors against cancer and cardiovascular disease) are generally present in large amounts. Thus moderate drinking may be an indicator of healthy lifestyle. On the other hand, most studies have controlled for smoking and education, factors associated with alcohol drinking. Risk differences between various alcoholic beverages could also be ascribed to a corresponding different pattern of drinking. It has been suggested that not only the amount but also the frequency of drinking may be relevant. For example, the risk of a major coronary event was lower in subjects consuming alcohol on five or six days per week than in subjects consuming the same amount of alcohol one or two days a week (McElduff and Dobson, 1997). A regular intake of small amount of alcohol seems to be more associated with wine drinking, which is generally consumed with meals, than other alcoholic beverages. A large cohort study conducted in Italy has shown that drinking wine outside meals is associated with higher mortality compared with drinking wine during meals (Trevisan et al., 2001). In addition, a lower mortality from all causes, cardiovascular disease and coronary heart disease was observed in men drinking wine with meals compared to non-drinkers. Polyphenols and resveratrol What could be responsible for the particular protective effect, if it exists, of wine against cancer development? The protective effect of moderate alcohol consumption on cardiovascular disease has been mainly attributed to the ability of ethanol to increase high-density lipoprotein (HDL) cholesterol and to decrease platelet aggregation (Criqui et al., 1987; Renaud and de Lorgeril, 1992). As ethanol has been shown to act as a co-carcinogen, increasing the activation of carcinogens, oxidative stress and cell proliferation (Simanowski et al., 1986; Garro and Lieber, 1990; Cahill et al., 1997) it is likely that the beneficial effects of alcohol, particularly red wine, on cancer are mainly due to the presence of substances other than ethanol. Polyphenolic compounds which are present 10–20 times higher in red wine than in white wine (Soleas et al., 1997) have been suggested as protective factors. This category includes flavonoids (flavones, flavanones, anthocyanins, catechins) and non-flavonoid phenols. These compounds are widely present in fruits, vegetables, grains, tea and wine; however, their availability seems much higher in wine, where polyphenols are present in monomeric form, in contrast to polymeric form in solid foodstuff (Goldberg, 1995). Several therapeutic properties of polyphenols have been described, including increased levels of HDL cholesterol, decreased platelet aggregation and endothelial adhesion, antioxidant activity, free radical scavenging, inhibition of cell proliferation and angiogenesis (Soleas et al., 1997; Nijveldt et al., 2001). A specific non-flavonoid polyphenolic compound, resveratrol (3,5,40 -trihydroxystilbene), mainly in its trans-isoform, has attracted the attention of recent research as an agent responsible for beneficial effects of wine. Apart from its occurrence in peanuts, this compound is present at significant levels only in red wine. Resveratrol is synthesized in the skin of grapes in response to external injuries, reaching concentrations of 50–100 mg/g (Jang et al., 1997). Its concentration in wine depends on fermentation time of the grapes, and therefore, as skins are removed much earlier for the preparation of white wine, red wine contains much higher amounts of resveratrol. The concentration of resveratrol is highly variable depending on the type of wine; values up to 0.1 mg/mL in white wines and 0.65 mg/mL in red wines have been reported (Siemann and Creasy, 1992; Goldberg et al., 1995). Higher values for red wines, up to 5 mg/mL, have also been reported (McMurtrey et al., 1994; Pezet et al., 1994; Goldberg et al., 1995; Ector et al., 1996). Mechanistic pathways Several mechanistic pathways that could account for the cancer-preventive activity of resveratrol have been explored, suggesting that resveratrol may affect either initiation or promotion and progression of the cancer process (Jang et al., 1997). Relevant hypotheses include inhibition of cytochrome P450 enzymes, antioxidant and anti-inflammatory activities, and effects on cell cycle, cell proliferation and apoptosis (Gusman et al., 2001). Copyright © Lippincott Williams & Wilkins. Unauthorized reproduction of this article is prohibited. 422 European Journal of Cancer Prevention 2003, Vol 12 No 5 Resveratrol inhibits CYP1A1, thus inhibiting the metabolic activation of pro-carcinogens, such as the polycyclic aromatic hydrocarbons, benzo[a]pyrene and dimethylbenz[a]anthracene (Chun et al., 1999; Ciolino and Yeh, 1999; Mollerup et al., 2001). The effect seems to be due either to direct inhibition of the enzymatic activity or to the inhibition of signal transduction mediated by the aryl hydrocarbon receptor (Ciolino and Yeh, 1999). The cancer preventive activity of resveratrol could also be attributed to its antioxidant properties. Resveratrol reduces oxidative damage induced by H2O2 in calf thymus DNA (Burkhardt et al., 2001) and in several cancer cell lines (Damianaki et al., 2000; Sgambato et al., 2001). Levels of 8-hydroxy-20 -deoxyguanosine, a known marker of oxidative DNA damage, are also reduced in vivo by administration of resveratrol (Cadenas and Barja, 1999; Mizutani et al., 2001). The anti-inflammatory activity of resveratrol seems mainly related to the inhibition of cyclooxygenases, although results have been inconsistent. Jang et al. (1997) reported that resveratrol selectively inhibited the expression of COX-1, but not the inducible form of the enzyme COX-2 that is more related to tumorigenesis. On the contrary, inhibition of the transcription and the expression of COX-2 have been reported (Subbaramaiah et al., 1998). The inhibition of COX-2 seems responsible for the protection against experimental carcinogenesis. For example, the reduced number or decreased size of oesophageal tumours induced by N-nitrosomethylbenzylamine in rats treated with resveratrol could be explained by the inhibition of the expression of COX-1 and COX-2 and the decrease in prostaglandin E2 levels (Li et al., 2002). Resveratrol also suppresses DMBA-induced mammary carcinogenesis, and this effect correlated with down-regulation of COX-2; the down-regulation of COX-2 seems also to be linked to suppression of the activation of the transcriptor factor NF-kB (Banerjee et al., 2002). This factor is inactive in the cytoplasm of normal cells due to binding with the inhibitor protein IkB; when activated, it can translocate to the nucleus and induce the expression of genes associated with the inflammatory processes and the development of cancer, such as altered cell growth, immune or inflammatory responses (Baldwin, 1996). The inhibitory activity of resveratrol on NF-kB seems to be due to the inhibition of the IkB kinase activity (Holmes-McNary and Baldwin, 2000). Several studies have attributed the anti-tumour activity of resveratrol to its effect on the cell cycle, cell proliferation and apoptosis; these effects have been recently reviewed (Gusman et al., 2001). The effect on cell cycle progression is highly variable, depending on the experimental system (Della Ragione et al., 1998; Schneider et al., 2000; Park et al., 2001; Joe et al., 2002). Cell proliferation is inhibited in a dose-dependent manner in different human cancer cell lines, and the effect seems rather specific for malignant cells (Clement et al., 1998). The anti-proliferative effect of resveratrol may be due to inhibition of polyamine biosynthesis through inhibition of ornithine decarboxylase activity (Schneider et al., 2000) or through inhibition of ribonucleotide reductase (Fontecave et al., 1998). Resveratrol has also been shown to decrease the proliferation of breast cancer cell lines (Mgbonyebi et al., 1998; Lu and Serrero, 1999; Damianaki et al., 2000; Levenson et al., 2003), although increased proliferation was also reported (Gehm et al., 1997; Schmitt et al., 2002). The effects on cell growth are possibly mediated by an interaction with the oestrogen receptor (ER); however this seems not to be the only mechanism, as inhibition of proliferation has been observed in both ER + and ER-cells (Mgbonyebi et al., 1998; Damianaki et al., 2000, Levenson et al., 2003). Several studies have reported an induction of apoptosis by resveratrol (Clement et al., 1998; Huang et al., 1999; Surh et al., 1999; Tessitore et al., 2000; Lu et al., 2001; Mahyar-Roemer et al., 2001; Joe et al., 2002), although conflicting results have been obtained regarding the mechanism associated with such induction. Cell death seems to occur only in tumour cells and has been shown to involve the CD95-CD95L system (Clement et al., 1998). Resveratrol could inhibit apoptosis through induction of P53 activity (Huang et al., 1999; Lu et al., 2001; She et al., 2001; Narayanan et al., 2003) but a p-53 independent pathway has also been proposed (MahyarRoemer et al., 2001). Cyclins (D1, A, B1), p21 expression, the apoptosis agonist bax and the anti-apoptotic bcl-2 have also been reported to be involved (Surh et al., 1999; Tessitore et al., 2000; Mahyar-Roemer et al., 2001; Joe et al., 2002). The similarity between resveratrol and the synthetic oestrogen diethylstilboestrol has raised questions regarding its oestrogenic activity. The oestrogenic properties of resveratrol have been studied quite extensively, although results are still contradictory. Resveratrol is able to bind to the ER, although with lower affinity than oestradiol; the affinity to ERa and ERb seems comparable (Bowers et al., 2000). This interaction can result in an agonistic, antagonistic or a mixed effect. In ER + MCF-7 cells, resveratrol alone acts as an agonist of the receptor (Gehm et al., 1997; Basly et al., 2000; Bhat et al., 2001; Schmitt et al., 2002) and acts as an antagonist when it is administered in combination with oestradiol (Lu and Serrero, 1999; Bhat et al., 2001). This antagonistic effect has been reported with other, but not all, mammary cell lines (Bhat et al., 2001), but it has also been questioned (Levenson et al., 2003). A super-agonist effect has been observed when resveratrol was co-administered with oestradiol (Gehm et al., 1997), although this has not been confirmed by others (Klinge et al., 2003). The Copyright © Lippincott Williams & Wilkins. Unauthorized reproduction of this article is prohibited. Wine and cancer Bianchini and Vainio 423 antagonist effect seems specific for the oestrogen receptor a, but not the oestrogen receptor b (Bowers et al., 2000). This may have relevant implications, as the presence of a or b receptors differs between normal, premalignant and malignant breast tissues (Roger et al., 2001). It is noteworthy that resveratrol decreases the multiplicity and delays the occurrence of N-methyl-Nnitrosourea-induced mammary tumours in the rat (Bhat et al., 2001). The observation that resveratrol suppresses the incidence of tumours during early stages (up to 40 days), and that pre-malignant lesions are mainly composed of ER + cells, suggest that preventive effects of resveratrol could be mediated by its anti-oestrogenic properties. As resveratrol seems to have anti-proliferative and antioestrogenic effect on endometrial adenocarcinoma cells (Bhat and Pezzuto, 2001), it has been proposed as a new phytoestrogen, showing a tissue-specific profile in modulating the oestrogen receptor. It has recently been suggested that substances present in red wine, other than resveratrol, might have oestrogenic effects (Klinge et al., 2003). accumulating for a beneficial effect, or at least for lack of a harmful effect on the development of certain cancers. The protection appears more pronounced with wine, and it is speculated that resveratrol, a natural component specifically present in red wine may be the main component responsible for this effect. Although these findings might be significant for light drinkers from an individual point of view, recommending regular consumption of small doses of wine for the general public is inappropriate for many reasons. In order to establish a causal relationship between consumption of wine or resveratrol and prevention of disease, a beneficial effect should be demonstrated in intervention studies, in which known doses of wine and/ or resveratrol are given for a precise duration. Relevant surrogate biomarkers of effect, instead of final disease endpoints, could be used. Further investigation in the mechanisms of action of putative protective agents and the causal association with cancer, as well as studies on the absorption, metabolism and toxicity are also needed before any wider use in humans can be considered. Availability in vivo Resveratrol might represent a promising agent to be tested for cancer chemo-preventive activity in clinical trials. The concentrations of resveratrol shown to have biological activity in vitro range, approximately, from 5– 50 mM, although higher levels seem to be needed for some effects. The concentration of resveratrol in wine is 3–20 mM (0.65 mg/L to 5 mg/L); the percentage available for an effect in vivo is still not clear, as only limited data on the kinetics of resveratrol have been published. Studies in isolated rat small intestine have shown that resveratrol is mainly conjugated with glucuronic acid during its absorption through the intestinal wall (Andlauer et al., 2000; Kuhnle et al., 2000). A recent study in rats has shown that resveratrol is available at 38% after oral administration and confirmed that resveratrol undergoes in vivo extensive glucuronidation (Marier et al., 2002); it was also shown that important enterohepatic recirculation occurs, although its contribution to the pharmacological effect remains unclear. Another study showed that resveratrol, following administration to rats, rapidly reached a peak concentration in blood and at least 50% of the compound was absorbed (Soleas et al., 2001a). Following oral administration to mice, resveratrol remained mostly in the intact form and penetrated tissues, mainly liver and kidney (Vitrac et al., 2003). However only 10–15% of resveratrol administered in white wine to humans is absorbed and may undergo metabolism before excretion in the urine (Soleas et al., 2001b). Conclusions Regular intake of low doses of alcohol seems to be associated with reduced total mortality and reduced risk and mortality from cardiovascular disease. Evidence is In addition, recommending a change in alcohol drinking habits, especially among non-drinkers, could have deleterious effect on those prone to addiction, leading to excessive drinking and to all the negative social and cultural consequences of such behaviour. An alternative approach could be to adopt an upper ‘safe’ limit of alcohol consumption. For example, the National Health and Medical Research Council in Australia advises women and men not to consume more than two or four drinks per day, respectively (National Health and Medical Research Council, 1992). 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