Abstract
The role of intracellular Ca2+ pools in the regulation of growth factor signal transduction pathways and mitogenesis is not well understood. We have examined the roles of basal and transiently mobilized Ca2+ in the regulation of MAP kinases by EGF. To assess the influence of Ca2+ transients we utilized Plcg1−/− and Plcg1+/+ mouse embryonic fibroblasts, while BAPTA/AM was employed to chelate total intracellular Ca2+ in the same cell lines. The MAP kinases erk-1, erk-2 and erk-5 exhibited similar patterns of activation in wild-type and Plcg1−/− cells treated with EGF. However, pretreatment with BAPTA/AM significantly increased and prolonged erk-1 and erk-2 activation in both cell types. In contrast, BAPTA/AM prevented the EGF activation of erk-5 in wild-type and Plcg1−/− cells. These data indicate that basal Ca2+, but not growth factor provoked Ca2+ transients, has a significant influence on the activation of these MAP kinases. AG1478, a specific EGF receptor kinase inhibitor, abolished the prolonged erk-1 and erk-2 activation produced by EGF in cells pretreated with BAPTA/AM. This indicates that the prolonged activation of erk-1 and erk-2 produced in the presence of BAPTA/AM requires continuous signaling from the EGF receptor kinase.
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Acknowledgements
The authors appreciate the generosity of Dr Jiing-Dwan Lee (Scripps Research Institute) for the gift of antibody to erk-5 and the assistance of Sue Carpenter in preparation of the manuscript. Grant support (CA75195) from the National Institutes of Health is acknowledged.
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Ji, Qs., Carpenter, G. Role of basal calcium in the EGF activation of MAP kinases. Oncogene 19, 1853–1856 (2000). https://doi.org/10.1038/sj.onc.1203517
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DOI: https://doi.org/10.1038/sj.onc.1203517
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