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Cancer Lett. 2013 Aug 9;336(1):185-95. doi: 10.1016/j.canlet.2013.04.027. Epub 2013 May 2.

OXER1, a G protein-coupled oxoeicosatetraenoid receptor, mediates the survival-promoting effects of arachidonate 5-lipoxygenase in prostate cancer cells.

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1
Vattikuti Urology Institute, Henry Ford Health System, Detroit, MI 48202, USA.

Abstract

Inhibition of 5-Lox induces apoptosis in prostate cancer cells by inactivating PKCε which is prevented by 5-oxoETE, and activators of PKCε prevent 5-Lox inhibition-induced apoptosis, suggesting that 5-Lox metabolites exert survival signaling via PKCε. However, mechanisms by which 5-Lox metabolites activate PKCε are not understood yet. We found that prostate cancer cells express high levels of OXER1, a G protein-coupled 5-oxoETE receptor, which delivers signal by generating diacyl-glycerol through phospholipase C-beta. Interestingly, we found that U73122, an inhibitor of PLC-beta, interrupts the apoptosis-preventing effect of 5-oxoETE, and exogenous diacyl-glycerol effectively prevents 5-Lox inhibition-induced apoptosis, suggesting that 5-oxoETE signals via OXER1 to promote prostate cancer cell survival.

PMID:
23643940
PMCID:
PMC3892773
DOI:
10.1016/j.canlet.2013.04.027
[Indexed for MEDLINE]
Free PMC Article

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