The role of Ca2+ mobilization and heterotrimeric G protein activation in mediating tyrosine phosphorylation signaling patterns in vascular smooth muscle ... View Full Text


Ontology type: schema:Chapter     


Chapter Info

DATE

2000

AUTHORS

Peter P. Sayeski , M. Showkat Ali , Kenneth E. Bernstein

ABSTRACT

This work investigated the role of Ca2+ mobilization and heterotrimeric G protein activation in mediating angiotensin II-dependent tyrosine phosphorylation signaling patterns. We demonstrate that the predominant, angiotensin II-dependent, tyrosine phosphorylation signaling patterns seen in vascular smooth muscle cells are blocked by the intracellular Ca2+ chelator BAPTAAM, but not by the Ca2+ channel blocker verapamil. Activation of heterotrimeric G proteins with NaF resulted in a divergent signaling effect; NaF treatment was sufficient to increase tyrosine phosphorylation levels of some proteins independent of angiotensin II treatment. In the same cells, NaF alone had no effect on other cellular proteins, but greatly potentiated the ability of angiotensin II to increase the tyrosine phosphorylation levels of these proteins. Two proteins identified in these studies were paxillin and Jak2. We found that NaF treatment alone, independent of angiotensin II stimulation, was sufficient to increase the tyrosine phosphorylation levels of paxillin. Furthermore, the ability of either NaF and/or angiotensin II to increase tyrosine phosphorylation levels of paxillin is critically dependent on intracellular Ca2+. In contrast, angiotensin II-mediated Jak2 tyrosine phosphorylation was independent of intracellular Ca2+ mobilization and extracellular Ca2+ entry. Thus, our data suggest that angiotensin II-dependent tyrosine phosphorylation signaling cascades are mediated through a diverse set of signaling pathways that are partially dependent on Ca2+ mobilization and heterotrimeric G protein activation. (Mol Cell Biochem 212: 91–98, 2000) More... »

PAGES

91-98

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/978-1-4615-4351-0_11

DOI

http://dx.doi.org/10.1007/978-1-4615-4351-0_11

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1028767775


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