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Mol. Cells 2006; 21(3): 395-400

Published online January 1, 1970

© The Korean Society for Molecular and Cellular Biology

Human Glutathione S-Transferase P1 Suppresses MEKK1-mediated Apoptosis by Regulating MEKK1 Kinase Activity in HEK293 Cells

Xin Zhao, Yumei Fan, Jiayin Shen, Yifan Wu, Zhimin Yin

Abstract

Glutathione S-transferase P1 (GSTP1) plays an important role in detoxification and the metabolism of xenobiotics. Here we show that GSTP1 also regulates the MEKK1-MKK7 signaling pathway. Over-expression of GSTP1 in HEK293 cells inhibited both DMEKK1- and etoposide-induced apoptosis, and inhibited pro-caspase-3 activation and PARP cleavage. MEKK1-induced apoptosis requires both its kinase activity and proteolytic cleavage. DMEKK1 activity was inhibited by over-expression of GSTP1 in vivo and MEKK1 kinase activity was also inhibited by GSTP1 in vitro when assayed with bacterially-expressed MKK7(KM) protein as substrate. GSTP1 inhibition of etoposide-induced cell apoptosis was mainly due to its ability to suppress MEKK1 kinase activity. The glutathione-conjugating activity of GSTP1 was essential for the above effects. These findings provide insight into the mechanism by which GSTP1 protects cells from genotoxin-induced apoptosis.

Keywords Apoptosis; Caspase-3; Etoposide; GSTP1; Kinase Activity; MEKK1

Article

Research Article

Mol. Cells 2006; 21(3): 395-400

Published online June 30, 2006

Copyright © The Korean Society for Molecular and Cellular Biology.

Human Glutathione S-Transferase P1 Suppresses MEKK1-mediated Apoptosis by Regulating MEKK1 Kinase Activity in HEK293 Cells

Xin Zhao, Yumei Fan, Jiayin Shen, Yifan Wu, Zhimin Yin

Abstract

Glutathione S-transferase P1 (GSTP1) plays an important role in detoxification and the metabolism of xenobiotics. Here we show that GSTP1 also regulates the MEKK1-MKK7 signaling pathway. Over-expression of GSTP1 in HEK293 cells inhibited both DMEKK1- and etoposide-induced apoptosis, and inhibited pro-caspase-3 activation and PARP cleavage. MEKK1-induced apoptosis requires both its kinase activity and proteolytic cleavage. DMEKK1 activity was inhibited by over-expression of GSTP1 in vivo and MEKK1 kinase activity was also inhibited by GSTP1 in vitro when assayed with bacterially-expressed MKK7(KM) protein as substrate. GSTP1 inhibition of etoposide-induced cell apoptosis was mainly due to its ability to suppress MEKK1 kinase activity. The glutathione-conjugating activity of GSTP1 was essential for the above effects. These findings provide insight into the mechanism by which GSTP1 protects cells from genotoxin-induced apoptosis.

Keywords: Apoptosis, Caspase-3, Etoposide, GSTP1, Kinase Activity, MEKK1

Mol. Cells
Nov 30, 2023 Vol.46 No.11, pp. 655~725
COVER PICTURE
Kim et al. (pp. 710-724) demonstrated that a pathogen-derived Ralstonia pseudosolanacearum type III effector RipL delays flowering time and enhances susceptibility to bacterial infection in Arabidopsis thaliana. Shown is the RipL-expressing Arabidopsis plant, which displays general dampening of the transcriptional program during pathogen infection, grown in long-day conditions.

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