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. 1998 Nov 1;335(Pt 3):505–511. doi: 10.1042/bj3350505

Stimulation of the Ca2+-mediated egr-1 and c-fos expression in murine erythroleukaemia cells by cyclosporin A.

A Schaefer 1, M Magócsi 1, A Fandrich 1, H Marquardt 1
PMCID: PMC1219809  PMID: 9794788

Abstract

The Ca2+-induced expression of the primary response genes egr-1 and c-fos was investigated in the murine erythroleukaemia cell line ELM-I-1. Exposure of the cells to the Ca2+-ionophore A23187 led to a rapid transient rise in egr-1 and c-fos mRNA production followed by an increase in Egr-1 and c-Fos protein levels as well as an increase in Egr-1 and activator protein 1 (AP-1) DNA-binding activity. Preincubation of the cells with KN-62, a specific inhibitor of Ca2+/calmodulin-dependent protein kinases, strongly decreased the Ca2+-mediated expression of egr-1 and c-fos. In contrast, treatment with cyclosporin A, which inhibits the Ca2+/calmodulin-dependent protein phosphatase 2B or calcineurin, increased both egr-1 and c-fos mRNA production and the DNA-binding activity of the Egr-1 and AP-1 transcription factors in response to the intracellular Ca+ concentration ([Ca2+]i)-increasing agents A23187 or cyclopiazonic acid. Enhancement of the Ca2+-induced c-fos and egr-1 expression by cyclosporin A was correlated with the capability of this agent to inhibit calcineurin phosphatase activity in ELM-I-1 cells. Studies on the phosphorylation state and DNA-binding activity of the cAMP response element-binding protein (CREB) did not demonstrate an early Ca2+-dependent activation of this transcription factor, suggesting that the regulation of c-fos and egr-1 expression by Ca2+ is not linked to CREB in the haematopoietic ELM-I-1 cells. The results indicate that calcineurin exerts negative regulatory effects on both egr-1 and c-fos expression in murine erythroleukaemia cells, in addition to the calcineurin-mediated down-regulation of c-myb expression observed previously in this cell system. This study therefore emphasizes the important role of calcineurin as a negative modulator of gene expression in certain cell types.

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Selected References

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