Differential expression of thrombospondin (THBS1) in tumorigenic and nontumorigenic prostate epithelial cells in response to a chromatin-binding soy peptide.

The chemopreventive properties of the chromatin-binding soy peptide, lunasin, are well documented, but its mechanism of action is unclear. To elucidate the mechanism by which lunasin reduces tumor foci formation in cultured mammalian cells, nontumorigenic (RWPE-1) and tumorigenic (RWPE-2) human prostate epithelial cells were treated with lunasin followed by gene expression profiling and characterization of the chromatin acetylation status for certain chemopreventive genes. The genes HIF1A, PRKAR1A, TOB1, and THBS1 were upregulated by lunasin in RWPE-1 but not in RWPE-2 cells.

The interaction of genetic polymorphisms with lifestyle factors: implications for the dietary prevention of prostate cancer.

Multiple studies of the impact of lifestyle factors on the development of prostate cancer have yielded inconsistent results. This may be due to unrecognized heterogeneity of the study populations, specifically genetic polymorphisms, which directly affect lifestyle interventions. We review some known polymorphisms and mechanisms of action as related to dietary and other lifestyle interventions and prostate cancer carcinogenesis.