Volume 27, Issue 4 (7-2023)                   IBJ 2023, 27(4): 205-213 | Back to browse issues page

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Pourmollaei S, Farshbaf-Khalili A, Barzegari A, Bastani S, Babaie S, Fattahi* A et al . Anticancer Effect of Enterococcus faecium, Isolated from Vaginal Fluid, on Ovarian Cancer Cells. IBJ 2023; 27 (4) :205-213
URL: http://ibj.pasteur.ac.ir/article-1-3846-en.html
Background: Given the association between cervicovaginal microbiota and OVC, we investigated the effect of Enterococcus faecium conditioned medium (CM) on OVC (Caov-4) cells.
Methods: CM was obtained from the bacterium E. faecium isolated from the vagina of healthy women. The Caov-4 cells were treated with varying concentrations of CM that comprised co-cultured bacteria with 0.2, 0.5, 1, 1.5, and 2 OD for 12, 24, and 48 h. The apoptosis and growth of cancer cells were evaluated by 4′,6-diamidino-2-phenylindole (DAPI) staining, flow cytometry, and DNA laddering assay. Moreover, the expression of PTEN, BAX, BCL2, and AKT1 genes were analyzed using real-time PCR. 
Results: The CM at a concentration of 0.5 OD from the cultured bacteria and incubation time of 48 h showed the highest negative effect on the viability of cancer cells. The CM treatment increased DNA fragmentation and also induced apoptosis in Caov-4 cells. Interestingly, CM could decrease the expression of proapoptotic genes were less, while antiapoptotic genes were more than fluorouracil in the presence of CM.
Conclusion: CM of human-derived E. faecium could have an anticancer effect on OVC cells in a concentration- and time-dependent manner. This study demonstrated that E. faecium secretes anticancer substances into the CM, which could directly affect the viability and apoptosis of cancer cells.

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