Cardiac overexpression of a G(q) inhibitor blocks induction of extracellular signal-regulated kinase and c-Jun NH(2)-terminal kinase activity in in vivo pressure overload.
BACKGROUND
Understanding the cellular signals that initiate cardiac hypertrophy is of critical importance in identifying the pathways that mediate heart failure. The family of mitogen-activated protein kinases (MAPKs), including the extracellular signal-regulated kinases (ERKs), c-Jun NH(2)-terminal kinase (JNK), and p38 MAPKs, may play specific roles in myocardial growth and function.


RESULTS
To determine the mechanism of activation of MAPK pathways during the development of cardiac hypertrophy, we evaluated the induction of MAPK activity after aortic constriction in wild-type and in 2 types of cardiac gene-targeted mice: one overexpressing a carboxyl-terminal peptide of Galpha(q) that inhibits G(q)-mediated signaling (TG GqI mouse) and another overexpressing a carboxyl-terminal peptide of beta-adrenergic receptor kinase-1 that inhibits Gbetagamma signaling (TG betaARKct mouse). Wild-type mice with pressure overload showed an acute induction of JNK, followed by the induction of p38/p38beta at 3 days and ERK at 7 days. Both JNK and p38 activity remained elevated at 7 days after banding. In TG GqI mice, hypertrophy was significantly attenuated, and induction of ERK and JNK activity was abolished, whereas the induction of p38 and p38beta was robust, but delayed. By contrast, all 3 MAPK pathways were activated by aortic constriction in the TG betaARKct hearts, suggesting a role for Galpha(q), but not Gbetagamma.


CONCLUSIONS
Taken together, these data show that the induction of ERK and JNK activity in in vivo pressure-overload hypertrophy is mediated through the stimulation of G(q)-coupled receptors and that non-G(q)-mediated pathways are recruited to activate p38 and p38beta.
Esposito
G
G
Department of Medicine and Cell Biology, Duke University Medical Center, Durham, NC 27710, USA.
Prasad
S V
SV
Rapacciuolo
A
A
Mao
L
L
Koch
W J
WJ
Rockman
H A
HA
D000818:Animals; D006332:Cardiomegaly / Q000201:enzymology* / Q000378:metabolism; D004195:Disease Models, Animal; D004790:Enzyme Induction; D043802:GTP-Binding Protein alpha Subunits, Gq-G11; D020962:Heterotrimeric GTP-Binding Proteins / Q000037:antagonists & inhibitors / Q000378:metabolism*; D048031:JNK Mitogen-Activated Protein Kinases; D051379:Mice; D008810:Mice, Inbred C57BL; D008822:Mice, Transgenic; D048290:Mitogen-Activated Protein Kinase 11; D020928:Mitogen-Activated Protein Kinases / Q000096:biosynthesis* / Q000378:metabolism*; D009206:Myocardium / Q000201:enzymology*; D010455:Peptides; D011312:Pressure; D048051:p38 Mitogen-Activated Protein Kinases
D010455:Peptides; D048031:JNK Mitogen-Activated Protein Kinases; D048290:Mitogen-Activated Protein Kinase 11; D020928:Mitogen-Activated Protein Kinases; D048051:p38 Mitogen-Activated Protein Kinases; D043802:GTP-Binding Protein alpha Subunits, Gq-G11; D020962:Heterotrimeric GTP-Binding Proteins