✦ LIBER ✦

Phospholipase C–protein kinase C mediated phospholipase D activation pathway is involved in tamoxifen induced apoptosis

✍ Scribed by Soo-Jung Ahn; Mee-Sup Yoon; Shin Hyuk; Wonshik Han; Yong-Dal Yoon; Joong-Soo Han; Dong-Young Noh

Publisher: John Wiley and Sons
Year: 2003
Tongue: English
Weight: 294 KB
Volume: 89
Category: Article
ISSN: 0730-2312
DOI: 10.1002/jcb.10532

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

Tamoxifen (TAM) is the endocrine therapeutic agent the most widely used in the treatment of breast cancer, and it operates primarily through the induction of apoptosis. In this study, we attempted to elucidate the non‐ER mediated mechanism behind TAM treatment, involving the phospholipase C–protein kinase C (PLC–PKC) mediated phospholipase D (PLD) activation pathway, using multimodality methods. In TAM treated MCF7 cells, the PLC and PLD protein and mRNA levels increased. Phosphatidylethanol (PEt) and diacylglycerol (DAG) generation also increased, showing increased activity of PLD and PLCγ1. Translocation of PKCα, from cytosol to membrane, was observed in TAM treated cells. By showing that both PKC and PLC inhibitors could reduce the effects of TAM‐induced PLD activation, we confirmed the role of PKC and PLC as upstream regulators of PLD. Finally, we demonstrated that TAM treatment reduced the viability of MCF7 cells and brought about rapid cell death. From these results, we confirmed the hypothesis that TAM induces apoptosis in breast cancer cells, and that the signal transduction pathway, involving PLD, PLC, and PKC, constitutes one of the possible mechanisms underlying the non‐ER mediated effects associated with TAM. © 2003 Wiley‐Liss, Inc.

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