Loss of rat ventricular alpha 1-adrenergic receptors during aging.
Ventricular alpha 1-adrenergic receptor concentration, measured by specific binding of [3H]-prazosin, decreases by 33% as rats age from 3 to 24 months. No age changes occur in binding affinity for [3H]-prazosin or potency of various alpha-adrenergic agonists and antagonists to displace [3H]-prazosin. The ratio of membrane protein to ventricular wet weight also does not change significantly with age. These results suggest a possible mechanism for loss of cardiovascular alpha-adrenergic responsiveness during aging.
D000375:Aging; D000818:Animals; D006321:Heart / Q000502:physiology; D006352:Heart Ventricles / Q000378:metabolism; D008297:Male; D009206:Myocardium / Q000378:metabolism*; D011224:Prazosin / Q000378:metabolism; D051381:Rats; D011919:Rats, Inbred Strains; D011941:Receptors, Adrenergic / Q000378:metabolism*; D011942:Receptors, Adrenergic, alpha / Q000378:metabolism*
D011941:Receptors, Adrenergic; D011942:Receptors, Adrenergic, alpha; D011224:Prazosin