학술논문
SP600125, an inhibitor of c-jun N-terminal kinase, activates CREB by a p38 MAPK-mediated pathway
Document Type
Article
Source
Subject
*PANCREATIC beta cells
*APOPTOSIS
*MICE
*
*
Language
ISSN
0006-291X
Abstract
SP600125, an anthrapyrazolone inhibitor of c-jun N-terminal kinase (JNK), has been used to characterize the role of JNK in apoptotic pathways. In this study, we have demonstrated an additional novel anti-apoptotic action of this inhibitor in MIN6 cells, a mouse beta cell line. SP600125 induced CREB-dependent promoter activation by 2.8-fold at 20 μM, the concentration at which it inhibited c-jun-dependent promoter activation by 51%. There was a significant (P<0.01 ) increase in CREB phosphorylation (serine 133) at 5 min, which persisted for a period of 2 h. Examination of signaling pathways upstream of CREB showed a 2.5-fold increase in the active phospho form of p38 MAPK. This finding was further confirmed by an in vitro kinase assay using ATF-2 as substrate. SB203580, an inhibitor of p38 MAPK, partially blocked SP600125-mediated activation of CREB. These observations suggest that SP600125 could be used as a small molecular weight activator of CREB. [Copyright &y& Elsevier]