PMID: 2112511Jun 1, 1990Paper

Regulation of cytosolic calcium by angiotensins in vascular smooth muscle

Hypertension
D E DostalM J Peach

Abstract

The carboxy terminal homologue of angiotensin II (Ang II), Ang-(3-8) or hexapeptide, was used as a model peptide to examine the types of receptor mechanisms involved in calcium mobilization in cultured vascular smooth muscle cells. Hexapeptide did not produce tachyphylaxis but did produce a sustained increase in intracellular calcium. Differences in the increase in intracellular calcium [( Ca2+]i) and the pattern of inositol phosphate production indicate that Ang-(3-8) and maximal concentrations of Ang II mobilize calcium through different mechanisms. The calcium-mobilizing mechanisms that predominate appear to depend on the concentration of angiotensin. Concentrations of Ang II greater than 10(-8) M produce sharp calcium transients in which the [Ca2+]i returns close to baseline within 1 minute after stimulation, but concentrations of Ang II equal to or less than 3 x 10(-9) M result in a plateau increase in calcium. Pretreatment with Bordetella pertussis toxin does not abolish either the calcium transient induced by Ang II or the plateau phase induced by Ang-(3-8), indicating that the GTP-transducing protein that couples the receptor to phospholipase C or, possibly, a receptor-operated calcium channel is not Bordetella pertussi...Continue Reading

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