Chemopreventive approaches for the treatment of breast cancer have been validated clinically and with in vitro studies. The combined action of tamoxifen/all‐trans retinoic acid was advantageous in MCF‐7 cells, reducing cell proliferation, Bcl‐2 and c‐Myc protein levels and increasing E‐Cadherin protein levels and Gap junctional Intercellular Communication. We further investigated their combined effect in the presence of bradykinin, a pro‐inflammatory agent, previously reported to contribute to the proliferation of breast cancer cells. Bradykinin increased MCF‐7 cell proliferation, c‐Myc levels and ERK1/2 activity. The co‐incubation of bradykinin‐MCF‐7 cells with tamoxifen/all‐trans retinoic acid reduced cell proliferation, ERK1/2 activity, as well as Bcl‐2, c‐Myc, and bradykinin receptor‐2 levels, without altering the enhanced E‐cadherin levels induced by tamoxifen/all‐trans retinoic acid. We showed that the anti‐tumoral effect of tamoxifen/all‐trans retinoic acid is beneficial in MCF‐7 breast cancer cells grown in a bradykinin‐pro‐mitogenic environment, an effect that might be, at least in part, through the MAPK pathway and B2‐bradykinin receptor inhibition. J. Cell. Biochem. 106: 473–481, 2009. © 2008 Wiley‐Liss, Inc.
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Effect of tamoxifen and retinoic acid on bradykinin induced proliferation in MCF‐7 cells
Searovic, Paola; Alonso, Marcelo; Oses, Carolina; Pereira‐Flores, Karla; Velarde, Victoria; Saez, Claudia G.
Follow Journal of Cellular Biochemistry
, Volume 106 (3)
Wiley – Feb 15, 2009
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