Abstract:
:Beta-adrenergic receptor (betaAR) blockade is a standard therapy for cardiac failure and ischemia. G protein-coupled receptor kinases (GRKs) desensitize betaARs, suggesting that genetic GRK variants might modify outcomes in these syndromes. Re-sequencing of GRK2 and GRK5 revealed a nonsynonymous polymorphism of GRK5, common in African Americans, in which leucine is substituted for glutamine at position 41. GRK5-Leu41 uncoupled isoproterenol-stimulated responses more effectively than did GRK5-Gln41 in transfected cells and transgenic mice, and, like pharmacological betaAR blockade, GRK5-Leu41 protected against experimental catecholamine-induced cardiomyopathy. Human association studies showed a pharmacogenomic interaction between GRK5-Leu41 and beta-blocker treatment, in which the presence of the GRK5-Leu41 polymorphism was associated with decreased mortality in African Americans with heart failure or cardiac ischemia. In 375 prospectively followed African-American subjects with heart failure, GRK5-Leu41 protected against death or cardiac transplantation. Enhanced betaAR desensitization of excessive catecholamine signaling by GRK5-Leu41 provides a 'genetic beta-blockade' that improves survival in African Americans with heart failure, suggesting a reason for conflicting results of beta-blocker clinical trials in this population.
journal_name
Nat Medjournal_title
Nature medicineauthors
Liggett SB,Cresci S,Kelly RJ,Syed FM,Matkovich SJ,Hahn HS,Diwan A,Martini JS,Sparks L,Parekh RR,Spertus JA,Koch WJ,Kardia SL,Dorn GW 2nddoi
10.1038/nm1750subject
Has Abstractpub_date
2008-05-01 00:00:00pages
510-7issue
5eissn
1078-8956issn
1546-170Xpii
nm1750journal_volume
14pub_type
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