Raf Kinase Inhibitor Protein Regulates Oxygen-glucose Deprivation-induced PC12 Cells Apoptosis Through the NF-κB and ERK Pathways

Overview

Journal J Clin Biochem Nutr

Specialty Biochemistry

Date 2016 Oct 5

PMID 27698534

Citations 4

Authors

Li Su

Hongli Du

Xin Dong

Xiuhua Zhang

Ziyang Lou

Affiliations

Soon will be listed here.

Abstract

Raf-1 kinase inhibitory protein (RKIP) is a critical molecule for cellular responses to stimuli. In this study, we investigated whether RKIP is responsible for neural cell apoptosis induced by oxygen-glucose deprivation (OGD) and explored the role of NF-κB and ERK pathways regulated by RKIP under OGD stimuli. RKIP was overexpressed or knocked down using lentivirus in PC12 cells, which were then challenged by OGD. RKIP overexpression significantly increased the cell viability of OGD cells, and attenuated apoptosis, cell cycle arrest, and reactive oxygen species generation. RKIP knockdown induced reverse effects. Moreover, we found that RKIP interacted with TAK1, NIK, IKK, and Raf-1 and negatively regulated the NF-κB and ERK pathways. RKIP overexpression significantly inhibited IKK, IκBα, and P65 phosphorylation in NF-κB pathway and MEK, ERK, and CREB phosphorylation in ERK pathway, respectively. RKIP knockdown induced reverse effects. Furthermore, a NF-κB inhibitor BAY 11-7082 and a MEK inhibitor U0126 blocked the changes caused by RKIP down-regulation after OGD. In conclusion, these results demonstrate that RKIP plays a key role in neural cell apoptosis caused by OGD partly via regulating NF-κB and ERK pathways. The present study may provide new insights into the role of RKIP in ischemic stroke.

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