K-252a inhibits the increase in c-fos transcription and the increase in intracellular calcium produced by nerve growth factor in PC12 cells

Journal of Neuroscience Research
P LazaroviciG Guroff

Abstract

K-252a, a kinase inhibitor isolated from the culture broth of Nocardiopsis sp., selectively inhibits, in a dose- and time-dependent fashion, the increased transcription of the protooncogene c-fos induced by nerve growth factor in PC12 cells. Induction of c-fos by epidermal growth factor, A23187, dBcAMP, or TPA in the same cells is not affected. Pretreatment with K-252a for 30 min results in a complete inhibition of the nerve growth factor-induced increase in intracellular calcium. Increases in intracellular calcium induced by carbachol or by high K+ are not altered. K-252a derivatives selective for the inhibition of various known kinases were used to inhibit the nerve growth factor-dependent induction of c-fos mRNA, the nerve growth factor-dependent increase in intracellular calcium levels, and the nerve growth factor-dependent outgrowth of neurites. K-252a is the most effective inhibitor of all three of these actions of nerve growth factor. The possible mechanisms by which K-252a acts on PC12 cells are considered in the light of the characteristics of the inhibitions seen here.

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