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Sci Signal. 2013 Dec 3;6(304):ra105. doi: 10.1126/scisignal.2004125.

PLC-γ and PI3K link cytokines to ERK activation in hematopoietic cells with normal and oncogenic Kras.

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1
1Department of Pediatrics and Benniof Children's Hospital, University of California, San Francisco, San Francisco, CA 94158, USA.

Abstract

Oncogenic K-Ras proteins, such as K-Ras(G12D), accumulate in the active, guanosine triphosphate (GTP)-bound conformation and stimulate signaling through effector kinases. The presence of the K-Ras(G12D) oncoprotein at a similar abundance to that of endogenous wild-type K-Ras results in only minimal phosphorylation and activation of the canonical Raf-mitogen-activated or extracellular signal-regulated protein kinase kinase (MEK)-extracellular signal-regulated kinase (ERK) and phosphoinositide 3-kinase (PI3K)-Akt-mammalian target of rapamycin (mTOR) signaling cascades in primary hematopoietic cells, and these pathways remain dependent on growth factors for efficient activation. We showed that phospholipase C-γ (PLC-γ), PI3K, and their generated second messengers link activated cytokine receptors to Ras and ERK signaling in differentiated bone marrow cells and in a cell population enriched for leukemia stem cells. Cells expressing endogenous oncogenic K-Ras(G12D) remained dependent on the second messenger diacylglycerol for the efficient activation of Ras-ERK signaling. These data raise the unexpected possibility of therapeutically targeting proteins that function upstream of oncogenic Ras in cancer.

PMID:
24300897
PMCID:
PMC4117477
DOI:
10.1126/scisignal.2004125
[Indexed for MEDLINE]
Free PMC Article
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