Role of intracellular Ca2+ sequestration in beta-adrenergic relaxation of a smooth muscle.

Abstract:

:Various mechanisms have been proposed for beta-adrenergically mediated relaxation of smooth muscle. All theories suggest the involvement of cyclic AMP as a second messenger: beta-agonists stimulate adenylate cyclase which converts ATP to cyclic AMP and protein kinase, activated by cyclic AMP, is then thought to catalyse a protein phosphorylation that leads to a reduction in free Ca2+, thus effecting relaxation. How this last step is accomplished is much debated, but the following possibilities are currently considered as the mechanisms responsible for cyclic AMP-induced reduction of cytoplasmic Ca2+: activation of a Ca2+-ATPase in the plasma and/or sarcoplasmic reticulum membranes which lowers cytoplasmic [Ca2+] in a direct manner or stimulation of (Na+-K+)ATPase in the cell membrane which may indirectly effect Ca2+ extrusion. Among the hypotheses suggested, those of Ca2+ sequestration by the sarcoplasmic reticulum and of Ca2+ extrusion across the cell membrane are consistent with each other if it is assumed that both processes are effected by a cyclic AMP-sensitive Ca2+-ATPase. However, quite a different mechanism is implied by involving the Na+-K+ pump and Na+-Ca2+ exchange carrier. In this report, we present evidence that suggests intracellular Ca2+ sequestration is the mechanism involved.

journal_name

Nature

journal_title

Nature

authors

Mueller E,van Breemen C

doi

10.1038/281682a0

subject

Has Abstract

pub_date

1979-10-25 00:00:00

pages

682-3

issue

5733

eissn

0028-0836

issn

1476-4687

journal_volume

281

pub_type

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