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. 1991 Aug 15;88(16):7096–7100. doi: 10.1073/pnas.88.16.7096

Regulation of c-fos and c-jun protooncogene expression by the Ca(2+)-ATPase inhibitor thapsigargin.

A Schönthal 1, J Sugarman 1, J H Brown 1, M R Hanley 1, J R Feramisco 1
PMCID: PMC52240  PMID: 1714585

Abstract

Thapsigargin, a non-phorbol-ester-type tumor promoter, discharges intracellular Ca2+ stores by specific inhibition of the endoplasmic reticulum Ca(2+)-ATPase. We used this drug to analyze the involvement of Ca2+ and Ca(2+)-ATPases in the control of growth- and transformation-related genes. Here we show that treatment of mouse NIH 3T3 fibroblasts with thapsigargin induced rapid expression of the c-fos and c-jun protooncogenes. Inhibition or depletion of protein kinase C partially diminished the c-fos but not the c-jun response. Furthermore, thapsigargin could synergize with the tumor promoter phorbol 12-myristate 13-acetate to induce c-fos but not c-jun. However, thapsigargin had no effect on basal or phorbol ester-induced protein kinase C activity. Our results indicate that Ca2+ is a potent second messenger that controls expression of growth- and transformation-related genes. Since inhibition of the endoplasmic reticulum Ca(2+)-ATPase results in a strong induction of these genes, our data suggest that this Ca2+ pump may act as a negative regulator of cell growth.

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