Inhibitory effects of an antiestrogen, toremifene, on the phorbol ester-induced adhesive capacity of breast carcinoma cells.

Abstract:

:Previous studies have revealed that protein kinase C (PKC) is responsible for malignant progression. In the present study, we investigated the potent inhibitory effects of an antiestrogen, toremifene, on PKC-mediated cellular adhesion. A phorbol ester, phorbol 12-myristate 13-acetate (PMA), significantly enhanced alpha2beta1 integrin-dependent adhesion of MCF-7 breast carcinoma cells. This PMA-induced adhesion was partially inhibited by incubating cells with toremifene prior to PMA exposure in a time- and dose-dependent manner. FACS analysis demonstrated that the PMA-induced alpha2beta1-dependent cellular adhesion was accompanied with elevated expression of alpha2beta1+integrin subunit on the cell surface. However, toremifene did not affect the elevated expression levels of these integrins but rather the avidity of alpha2beta1 integrin. We concluded that toremifene inhibited cellular adhesion activated by PMA, probably through mechanism which inhibits PKC.

journal_name

Int J Oncol

authors

Maemura M,Iino Y,Horiguchi J,Takei H,Horii Y,Koibuchi Y,Yokoe T,Takeyoshi I,Ohwada S,Morishita Y

doi

10.3892/ijo.13.5.981

subject

Has Abstract

pub_date

1998-11-01 00:00:00

pages

981-5

issue

5

eissn

1019-6439

issn

1791-2423

journal_volume

13

pub_type

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