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The Strathprints institutional repository is a digital archive of University of Strathclyde research outputs.

Strathprints serves world leading Open Access research by the University of Strathclyde, including research by the Strathclyde Institute of Pharmacy and Biomedical Sciences (SIPBS), where research centres such as the Industrial Biotechnology Innovation Centre (IBioIC), the Cancer Research UK Formulation Unit, SeaBioTech and the Centre for Biophotonics are based.

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Inactivation of jNK ACtivity by mitogen-activated protein kinase phosphatase-2 in Eahy926 endothelial cells is dependent upon agonist-specific jNK translocation to the nucleus

Robinson, C. and Sloss, C.M. and Plevin, R.J. (2001) Inactivation of jNK ACtivity by mitogen-activated protein kinase phosphatase-2 in Eahy926 endothelial cells is dependent upon agonist-specific jNK translocation to the nucleus. Cellular Signalling, 13 (1). pp. 29-41. ISSN 0898-6568

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Abstract

We have investigated the termination of agonist-stimulated mitogen-activated protein (MAP) kinase activity in EAhy926 cells by MAP kinase phosphatase-2 (MKP-2). In cells expressing either wild-type (WT) or catalytically inactive (CI)-MKP-2, there was no significant differences in TNFα-stimulated JNK or p38 MAP kinase activity, however hydrogen peroxide (H2O2)-stimulated JNK activity was substantially reduced in WT-MKP-2 expressing clones and enhanced in cells expressing CI-MKP-2. Consistent with these findings, we observed substantial nuclear translocation of JNK occurred in response to H2O2 but not TNFα. Using a phosphospecific anti-JNK antibody, we found that TNFα-stimulated JNK activity was associated principally with the cytosol while in response to H2O2, JNK activity was found within the nucleus. These results show that the role of MKP-2 in terminating JNK activity is determined by the translocation of JNK to the nucleus, which is under agonist-specific regulation and not a universal cellular response to stimulation.