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Department of Pharmacology, School of Medical Sciences, University
of Bristol, Bristol BS8 1TD, UK (S.J.M., E.K.), and
Department of
Biochemistry and Molecular Pharmacology, Kimmel Cancer Institute,
Thomas Jefferson University, Philadelphia, Pennsylvania 19107 (J.L.B.).
G protein-coupled receptor kinases (GRKs) are thought to be important
in mediating the agonist-induced phosphorylation and consequent
desensitization of G protein-coupled receptor responses. NG108-15
mouse neuroblastoma X rat glioma cells express a wide range of G
protein-coupled receptors and significant levels of GRK2. Therefore, to
determine the role of GRK2 in agonist-induced desensitization of
various Gs-coupled receptors in NG108-15 cells, we stably
transfected cells with a dominant negative mutant GRK2 construct
(Lys220Arg). In homogenates prepared from cells overexpressing the
dominant negative mutant GRK2, the acute stimulation of adenylyl cyclase by various receptor and nonreceptor agonists was the same as in
control cells stably transfected with plasmid only. NG108-15 cells
express both A2a and A2b adenosine receptors,
which mediate activation of adenylyl cyclase, with both of these
responses being subject to agonist-induced desensitization with a
t1/2 of 15-20 min. In dominant negative mutant
GRK2 cells, the rates of desensitization of A2a and
A2b receptor-stimulated adenylyl cyclase were markedly slower than in plasmid transfected controls, with the latter being similar to wild-type cells. After a 20-min treatment with an adenosine agonist, the desensitization of A2a and A2b
receptor-stimulated adenylyl cyclase in dominant negative mutant GRK2
cells was less than half that seen in plasmid transfected control
cells. On the other hand, the agonist-induced desensitization of
secretin and IP-prostanoid receptor-stimulated adenylyl cyclase was the
same in dominant negative mutant GRK2 cells as in plasmid transfected control cells. These results indicate that in intact cells, GRK2 may
mediate the desensitization of adenosine A2 receptors.
Furthermore, there seems to be selectivity of GRK2 action between
Gs-coupled receptors because the agonist-induced
desensitization of secretin and IP-prostanoid receptor-stimulated
adenylyl cyclase was not affected by dominant negative mutant GRK2
overexpression.
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