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. 1996 Aug 1;317(Pt 3):675–680. doi: 10.1042/bj3170675

Calcineurin is essential for DNA synthesis in Swiss 3T3 fibroblasts.

M Tomono 1, K Toyoshima 1, M Ito 1, H Amano 1
PMCID: PMC1217539  PMID: 8760349

Abstract

DNA synthesis was measured 16 h after stimulation of Swiss 3T3 fibroblasts in the resting phase with various growth factors (platelet-derived growth factor, fibroblast growth factor, lysophosphatidic acid and thrombin). When extracellular Ca2+ was chelated by EGTA, or when the influx of Ca2+ from outside to inside the cell was blocked by cobalt, DNA synthesis was completely inhibited. As there was no effect whatsoever on DNA synthesis when Ca2+ was chelated, or when the influx of Ca2+ was blocked up to the first 4 h after growth stimulation, it was concluded that, at an early stage, Ca2+ influx from outside to inside the cell is not related to the transition from the G1 to the S phase. A Ca2+/calmodulin-dependent protein kinase II inhibitor (KN-62) had no effect on DNA synthesis. However, cyclosporin A and FK-506, which are inhibitors of Ca2+/calmodulin-dependent protein phosphatase 2B (calcineurin), markedly inhibited DNA synthesis stimulated by all of the growth factors. These results indicate that calcineurin plays a role, not only in activation of T-cells of the immune system in the initial phase, but also in DNA synthesis in fibroblasts. It was concluded that Ca2+ influx from outside to inside the cell during the mid-to-late G1 phase, followed by calcineurin activation, is essential as a mechanism of growth signal transduction.

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