Antiproliferative and apoptotic effects of probiotic whey dairy beverages in human prostate cell lines

The present study aimed to evaluate the antiproliferative and apoptotic effects of probiotic whey dairy beverages in human prostate cancer cell lines (PC-3 and DU-145). Five different whey beverages were manufactured: conventional whey beverage (without addition of probiotic strain, CTL); and whey beverages containing Lactobacillus acidophilus La-05, Lactobacillus acidophilus La-03, Lactobacillus casei-01, and Bifidobacterium animalis Bb-12. Cell viability was determined by MTT assay and cell cycle arrest, and apoptosis by flow cytometry. All the samples presented cytotoxic activities against both cell lines. A decrease in the percentage of PC-3 cells in G(0)/G(1) and S, followed by an increase in G(2)/M phase were observed with L. casei-01, Bb-12 and La-05 beverages (50.0 and 100.0 mu g/mL). The extracts of the whey beverages caused extensive apoptosis induction in both cells' lines, regardless of the probiotic strain. However, the whey beverage added with L. casei-01 might be a better candidate against prostate cancer cells.