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FEBS Lett. 2010 Aug 20;584(16):3649-54. doi: 10.1016/j.febslet.2010.07.040. Epub 2010 Jul 25.

Insulin modulates induction of glucose-regulated protein 78 during endoplasmic reticulum stress via augmentation of ATF4 expression in human neuroblastoma cells.

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  • 1Department of Hygiene and Public Health I, Tokyo Women's Medical University, 8-1 Kawada-cho, Shinjuku-ku, Tokyo 162-8666, Japan. inageda@research.twmu.ac.jp

Abstract

The effect of insulin on endoplasmic reticulum (ER) stress was investigated. Insulin protected cell death induced by ER stress and increased glucose-regulated protein 78 (GRP78) mRNA and protein levels. Insulin also significantly increased activating transcription factor-4 (ATF4) protein in the nucleus, which was inhibited by LY294002, a phosphatidylinositol 3-kinase (PI-3 kinase) inhibitor. The increase of ATF4 protein by insulin was not due to transcriptional or translational up-regulation but to a post-translational mechanism. Knockdown of ATF4 by siRNA significantly inhibited GRP78 induction by insulin. These results indicate that insulin modulated ER stress-induced GRP78 expression occurs via ATF4 up-regulation.

Copyright 2010 Federation of European Biochemical Societies. Published by Elsevier B.V. All rights reserved.

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