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(Circulation. 2003;108:2926.)
© 2003 American Heart Association, Inc.
Basic Science Reports |
From the University of Medicine and Dentistry of New Jersey and New Jersey Medical School (V.G., C.D., G.T., S.F.V., D.E.V.), Newark, NJ; Millennium Pharmaceuticals Inc (J.E.T., J.N.T.), South San Francisco, Calif; University of Wurzburg (S.E., L.H., M.J.L.), Wurzburg, Germany; UT Southwestern Medical Center (C.L.A., E.N.O.), Dallas, Tex; and University of Cincinnati Medical Center (S.B.L.), Cincinnati, Ohio.
Correspondence to Dr Stephen F. Vatner, UMDNJ, Department of Cell Biology and Molecular Medicine, Cardiovascular Research Institute, 185 S Orange Ave, MSB-G609, Newark, NJ 07101. E-mail vatnersf{at}umdnj.edu
Received March 24, 2003; de novo received June 6, 2003; accepted August 12, 2003.
Background Although ß-adrenergic receptor (AR) blockade therapy is beneficial in the treatment of heart failure, little is known regarding the transcriptional mechanisms underlying this salutary action.
Methods and Results In the present study, we screened mice overexpressing Gs
, ß1AR, ß2AR, or protein kinase A to test if a common genomic pathway exists in different models with enhanced ß-adrenergic signaling. In mice overexpressing Gs
, differentially expressed genes were identified by mRNA profiling. In addition to well-known markers of cardiac hypertrophy (atrial natriuretic factor, CARP, and ß-myosin heavy chain), uncoupling protein 2 (UCP2), a protein involved in the control of mitochondrial membrane potential, and four-and-a-half LIM domain protein-1 (FHL1), a member of the LIM protein family, were predicted to be upregulated. Upregulation of these genes was confirmed by quantitative reverse transcriptasepolymerase chain reaction at all time points tested during the development of cardiomyopathy in mice overexpressing Gs
. In mice overexpressing ß1AR, ß2AR, or protein kinase A, increased UCP2 and FHL1 expression was also observed at the onset of cardiomyopathy. ßAR blockade treatment reversed the cardiomyopathy and suppressed the increased expression of UCP2 and FHL1 in mice overexpressing Gs
.
Conclusions UCP2 and FHL1 are important candidate genes that correlate with the development of ßAR-induced cardiomyopathy in different mouse models with enhanced ßAR signaling. In addition to preserving cardiac function, ßAR blockade treatment also prevents the genomic regulation that correlates with the onset of heart failure.
Key Words: receptors, adrenergic, beta cardiomyopathy genomics
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