Human metabotropic glutamate receptor 2 couples to the MAP kinase cascade in chinese hamster ovary cells.
We have examined the functional coupling of the human metabotropic glutamate receptor type 2 (mGluR2) with the regulation of the mitogen activated protein kinase (MAP kinase) signal transduction cascade. We demonstrated that L-glutamate stimulation of the human mGluR2 receptor transiently expressed in chinese hamster ovary (CHO) cells leads to a rapid increase in the activity of p42/p44 MAP kinase (also known as the extracellular signal regulated kinases, ERK1 and ERK2). Activation of p42/p44 MAP kinase has been demonstrated in a peptide phosphorylation assay and through the demonstration of a shift in electrophoretic mobility of p42 MAP kinase following activation. In both assay systems L-glutamate stimulation of MAP kinase was inhibited by pertussis toxin and by the MEK (MAP/ERK activating kinase) inhibitor PD 98059. We conclude that L-glutamate stimulation of the mGluR2 receptor in CHO cells mediated regulation of p42/p44 MAP kinase following the activation of pertussis toxin-sensitive G alpha(i) G-proteins via a distinct protein kinase signalling pathway that utilizes MEK.
Phillips
T
T
Department of Neurobiology, Babraham Institute, Cambridge, UK.
Barnes
A
A
Scott
S
S
Emson
P
P
Rees
S
S
D000818:Animals; D015153:Blotting, Western; D016466:CHO Cells; D017871:Calcium-Calmodulin-Dependent Protein Kinases / Q000037:antagonists & inhibitors / Q000378:metabolism*; D006224:Cricetinae; D004789:Enzyme Activation / Q000187:drug effects; D019204:GTP-Binding Proteins / Q000378:metabolism; D019950:Mitogen-Activated Protein Kinase 1 / Q000037:antagonists & inhibitors / Q000378:metabolism; D010766:Phosphorylation; D010957:Plasmids / Q000235:genetics; D016133:Polymerase Chain Reaction; D018091:Receptors, AMPA / Q000378:metabolism*; D014162:Transfection
D018091:Receptors, AMPA; D017871:Calcium-Calmodulin-Dependent Protein Kinases; D019950:Mitogen-Activated Protein Kinase 1; D019204:GTP-Binding Proteins; C104722:glutamate receptor ionotropic, AMPA 2