Resumo

GARCIA MEDIERO, J.M. et al. Effect of polyphenols in the mediterranean diet on proliferation and mediators of in vitro invasiveness of the mb-49 murine bladder cancer cell line. Actas Urol Esp [online]. 2005, vol.29, n.8, pp.743-749. ISSN 0210-4806.

Objective: To evaluate the effect of different polyphenols on the proliferation and invasive capacity of MB-49 murine bladder tumor cell lines and to identify the mediators involved in this process. Materials and Methods: MB-49 murine bladder cancer cells were cultured in media supplemented with resveratrol, rutin, morin, quercetin, gallic acid and tannic acid (all of them are polyphenols usually present in Mediterranean diet) for periods of 24, 48 and 72 hours to quantify the expression of urokinase-type plasminogen activator (uPA) and its receptor (uPAR) in the culture medium, as well as of metalloproteinase-9 (MMP-9) and cell proliferation. Results: All the polyphenols studied significantly inhibited proliferation of MB-49 cells, varying according to the time periods and doses used. The cells in the media supplemented with the nutrients to study did not show inhibition of mRNA expression of urokinase-type plasminogen activator (uPA) or its high affinity receptor (uPAR). It was even slightly increased in certain cases. However, mRNA expression of metalloproteinase-9 was strongly inhibited. Conclusions: The polyphenols present in our usual diet exert an effect on the proliferation and mediators of bladder tumor invasiveness in MB-49 cells.

Palavras-chave : Invasiveness; Polyphenols; upA; uPAR; MMP9; Bladder cancer; MB49.

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