Biological and Pharmaceutical Bulletin
Online ISSN : 1347-5215
Print ISSN : 0918-6158
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Identification of a Novel Protein Kinase A Inhibitor by Bioluminescence-Based Screening
Tetsuya IshimotoKenji AzechiHisashi Mori
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2015 Volume 38 Issue 12 Pages 1969-1974

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Abstract

We screened inhibitors in the adenylyl cyclase/protein kinase A/cAMP response element binding protein pathway (AC/PKA/CREB pathway) from a 2400 chemical library by a cell-based assay method using bioluminescence probes. We found a compound that inhibited forskolin-induced cAMP response element (CRE)-dependent transcription, the interaction between the kinase-inducible domain (KID) and the interacting domain (KIX), and endogenous CREB phosphorylation. Furthermore, this compound suppressed the activity of the PKA catalytic subunit dose-dependently. On the other hand, this compound did not inhibit forskolin-induced cAMP up-regulation. Taken together, we conclude that we have identified a new PKA inhibitor that binds to the catalytic subunit directly. We also succeeded in shortening the screening protocol by excluding a screening step which was used in a previous method.

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© 2015 The Pharmaceutical Society of Japan
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