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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 J+Cardiovasc+Pharmacol
2014 ; 63
(4
): 291-301
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gab.com Text
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English Wikipedia
Alpha-1-adrenergic receptors in heart failure: the adaptive arm of the cardiac
response to chronic catecholamine stimulation
#MMPMID24145181
Jensen BC
; O?Connell TD
; Simpson PC
J Cardiovasc Pharmacol
2014[Apr]; 63
(4
): 291-301
PMID24145181
show ga
Alpha-1-adrenergic receptors (ARs) are G protein-coupled receptors activated by
catecholamines. The alpha-1A and alpha-1B subtypes are expressed in mouse and
human myocardium, whereas the alpha-1D protein is found only in coronary
arteries. There are far fewer alpha-1-ARs than beta-ARs in the nonfailing heart,
but their abundance is maintained or increased in the setting of heart failure,
which is characterized by pronounced chronic elevation of catecholamines and
beta-AR dysfunction. Decades of evidence from gain and loss-of-function studies
in isolated cardiac myocytes and numerous animal models demonstrate important
adaptive functions for cardiac alpha-1-ARs to include physiological hypertrophy,
positive inotropy, ischemic preconditioning, and protection from cell death.
Clinical trial data indicate that blocking alpha-1-ARs is associated with
incident heart failure in patients with hypertension. Collectively, these
findings suggest that alpha-1-AR activation might mitigate the well-recognized
toxic effects of beta-ARs in the hyperadrenergic setting of chronic heart
failure. Thus, exogenous cardioselective activation of alpha-1-ARs might
represent a novel and viable approach to the treatment of heart failure.