title: Autoradiographic localization of alpha-adrenoceptors, muscarinic acetylcholine receptors and opiate receptors in the heart.
abstract: Using in vitro autoradiography the distribution of [3H]rauwolscine, [3H]prazosin and [3H]quinuclidinyl benzilate binding sites has been demonstrated in cardiac tissue taken from the cat and rat. A similar distribution of both alpha 1- and alpha 2-adrenoceptor sites was seen but the distribution of muscarinic acetylcholine sites was markedly different. alpha-Adrenoceptors were present predominantly in ventricular muscle whereas muscarinic acetylcholine receptors exhibited a greater density in atrial tissue compared to ventricular muscle. Opiate receptors were absent from cardiac tissue.
mesh_terms: D000818:Animals; D001345:Autoradiography; D002415:Cats; D005260:Female; D008297:Male; D009206:Myocardium / Q000378:metabolism*; D011224:Prazosin / Q000378:metabolism; D011813:Quinuclidinyl Benzilate / Q000378:metabolism; D051381:Rats; D011919:Rats, Inbred Strains; D011942:Receptors, Adrenergic, alpha / Q000378:metabolism*; D011976:Receptors, Muscarinic / Q000378:metabolism*; D011957:Receptors, Opioid / Q000378:metabolism*; D015016:Yohimbine / Q000378:metabolism
chemical_list: D011942:Receptors, Adrenergic, alpha; D011976:Receptors, Muscarinic; D011957:Receptors, Opioid; D015016:Yohimbine; D011813:Quinuclidinyl Benzilate; D011224:Prazosin