Il resveratrolo, come ogni buon pesticida che si rispetti, sembra essere cancerogeno anche a basse concetrazioni.
Mol Carcinog. 2010 Jun 22. [Epub ahead of print]
Growth-stimulatory effect of resveratrol in human cancer cells.
Fukui M, Yamabe N, Kang KS, Zhu BT.
Department of Pharmacology, Toxicology and Therapeutics, School of
Medicine, University of Kansas Medical Center, Kansas City, KS.
Earlier studies have shown that resveratrol could induce death in
several human cancer cell lines in culture. Here we report our
observation that resveratrol can also promote the growth of certain
human cancer cells when they are grown either in culture or in athymic
nude mice as xenografts. At relatively low concentrations (</=5
microM), resveratrol exerted a significant growth-stimulatory effect
in the MDA-MB-435s human cancer cells, but this effect was not
observed in several other human cell lines tested. Analysis of cell
signaling molecules showed that resveratrol induced the activation of
JNK, p38, Akt, and NF-kappaB signaling pathways in these cells.
Further analysis using pharmacological inhibitors showed that only the
NF-kappaB inhibitor (BAY11-7082) abrogated the growth-stimulatory
effect of resveratrol in cultured cells. In athymic nude mice,
resveratrol at 16.5 mg/kg body weight enhanced the growth of MDA-
MB-435s xenografts compared to the control group, while resveratrol at
the 33 mg/kg body weight dose did not have a similar effect.
Additional analyses confirmed that resveratrol stimulated cancer cell
growth in vivo through activation of the NF-kappaB signaling pathway.
Taken together, these observations suggest that resveratrol at low
concentrations could stimulate the growth of certain types of human
cancer cells in vivo. This cell type-specific mitogenic effect of
resveratrol may also partly contribute to the procarcinogenic effect
of alcohol consumption (rich in resveratrol) in the development of
certain human cancers. (c) 2010 Wiley-Liss, Inc.
PMID: 20572158 [PubMed - as supplied by publisher]