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2015 Fiscal Year Final Research Report

Mechanisms of regulation and signaling of NADPH oxidase 1 involved in cell proliferation

Research Project

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Project/Area Number 24510299
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Living organism molecular science
Research InstitutionEhime University

Principal Investigator

Tamura Minoru  愛媛大学, 理工学研究科, 准教授 (00128349)

Project Period (FY) 2012-04-01 – 2016-03-31
Keywordssuperoxide / Nox1 / betaPix / phosphorylation / colon epithelial cells / signaling
Outline of Final Research Achievements

Nox1 produces superoxide (O2-) in response to growth hormone such as EGF in colon epithelial cells. We found that betaPix is involved in the activation of Nox1, and EGF-induced phosphorylation at Ser-340 of betaPix enhanced its Nox1-activating ability. The phosphomimetic mutant of betaPix showed higher Rac-binding and GDP/GTP exchange ability which is required for Nox1 activation. In contrast, phosphorylation at Ser-525 eliminated its ability of Nox1 activation. Based on the results of in vivo and in vitro experiments with the phosphomimetic, unphosphorylatable, and truncated mutants, we proposed a mechanism of how phosphorylations at different sites caused opposite effects on Nox1-activating ability of betaPix.
We also examined the effect of O2- on Caco-2 cells using an O2- generating device we have developed, and found that O2- exogenously added caused apoptosis in the cells, and also oxidation of several cytosolic proteins involved in cytoskeleton, glycolysis, and protein synthesis.

Free Research Field

生化学, 細胞生物学

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Published: 2017-05-10  

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