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Non-specific in Vivo Inhibition of CK1 by the Pyridinyl Imidazole p38 Inhibitors SB 203580 and SB 202190

Non-specific in Vivo Inhibition of CK1 by the Pyridinyl Imidazole p38 Inhibitors SB 203580 and SB 202190

Naval P Shanware, Leah M Williams, Michael J Bowler, Randal S Tibbetts

BMB Rep. 2009 Mar 31;42(3):142-7.

PMID: 19336000

Abstract:

Small-molecule inhibitors of protein kinases have contributed immensely to our understanding of biological signaling pathways and have been exploited therapeutically for the treatment of cancers and other disease states. The pyridinyl imidazole compounds SB 203580 and SB 202190 were identified as ATP competitive antagonists of the p38 stress-activated protein kinases and have been widely used to elucidate p38-dependent cellular processes. Here, we identify SB 203580 and SB 202190 as potent inhibitors of stress-induced CREB phosphorylation on Serine 111 (Ser-111) in intact cells. Unexpectedly, we found that the inhibitory activity of SB 203580 and SB 202190 on CREB phosphorylation was independent of p38, but instead correlated with inhibition of casein kinase 1 (CK1) in vitro. The inhibition of CK1-mediated CREB phosphorylation by concentrations of pyridinyl imidazoles commonly employed to suppress p38, suggests that in some cases conclusions of p38-dependence derived solely from the use of these inhibitors may be invalid.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP152121307-B	SB 202190		152121-30-7	Price

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