Role of atypical protein kinase C in estradiol-triggered G1/S progression of MCF-7 cells.

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Citation

Castoria G, Migliaccio A, Di Domenico M, Lombardi M, de Falco A, Varricchio L, Bilancio A, Barone MV, Auricchio F

Role of atypical protein kinase C in estradiol-triggered G1/S progression of MCF-7 cells.

Mol Cell Biol. 2004 Sep;24(17):7643-53.

PubMed ID
15314172 [ View in PubMed
]
Abstract

Expression of a dominant negative atypical protein kinase C (aPKC), PKCzeta, prevents nuclear translocation of extracellular regulated kinase 2 (ERK-2), p27 nuclear reduction, and DNA synthesis induced by estradiol in human mammary cancer-derived MCF-7 cells. aPKC action upstream of these events has been analyzed. In hormone-stimulated NIH 3T3 and Cos cells ectopically expressing human estrogen receptor alpha (hERalpha), aPKC is activated by phosphatidylinositol 3-kinase (PI 3-kinase) and, in turn, controls the Ras/MEK-1/ERK cascade. In MCF-7 and Cos cells stimulated by hormone, PI 3-kinase activates PKCzeta by Thr410 phosphorylation. Serine phosphorylation of PKCzeta is simultaneously induced. PKCzeta activation leads to recruitment of Ras to a multimolecular complex that also includes hERalpha, Src, PI 3-kinase, and aPKC. We propose that PKCzeta pushes Ras and the signaling complex close together in such a way that it facilitates the Src-dependent Ras activation. This activation is crucial for the interplay between estradiol-triggered signaling and cell cycle machinery.

DrugBank Data that Cites this Article

Polypeptides
NameUniProt ID
Protein kinase C zeta typeQ05513Details