Cellular Biology |
From the Institut für Pharmakologie (A.G., G.S., S.O.), Universitätsklinikum Benjamin Franklin, Freie Universität Berlin, Berlin, Germany, and Pharmakologisches Institut (S.O.), Universität Heidelberg, Heidelberg, Germany. Dr Gohla is now at The Scripps Research Institute, La Jolla, Calif.
Correspondence to Dr Stefan Offermanns, Pharmakologisches Institut, Universität Heidelberg, Im Neuenheimer Feld 366, 69120 Heidelberg, Germany. E-mail stefan.offermanns{at}urz.uni-heidelberg.de
AbstractReceptor-induced
vascular smooth muscle cell contraction is mediated by dual regulation
of myosin light chain (MLC20)
phosphorylation through Ca2+-dependent
stimulation of myosin light chain kinase and Rho/Rho-kinasemediated
inhibition of myosin phosphatase. Although myosin light chain kinase
regulation is initiated by the coupling of receptors to G proteins of
the Gq family, Gq and G11, it is
not known how receptors regulate the Rho/Rho-kinasemediated pathway.
In vascular smooth muscle cells, receptor-mediated MLC20
phosphorylation and cell contraction was blocked by
inhibitors of each of the pathways. Receptors of various
vasocontractors were found to couple to Gq/G11
and G12/G13, and constitutively active forms of
G
12 and G
13 induced a pronounced
contraction of vascular smooth muscle cells that could be blocked by C3
exoenzyme, by inhibition of Rho-kinase, and by stable analogues of cGMP
and cAMP. Receptor-mediated smooth muscle cell contraction was strongly
inhibited by dominant-negative forms of G
12 and
G
13. These data indicate that a
G12/G13-mediated Rho/Rho-kinasedependent
pathway operates in smooth muscle cells and that dual regulation of
MLC20 phosphorylation by vasocontractors is
initiated by the dual coupling of their receptors to G proteins of the
Gq and G12 families.
Key Words: smooth muscle vasocontractors G proteins Rho-kinase myosin light chain phosphorylation
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