title: Studies of uptake of the bretylium analogue, iodobenzyltrimethylammonium iodide, by non-primate, monkey and human hearts.
abstract: Uptake of (+/-)-[3H]-noradrenaline, [14C]-bretylium and [125I]-o-iodobenzyltrimethylammonium iodide (RIBA) by rat heart was studied by the Langendorff technique. All three compounds showed significant uptake. 2 Corticosterone and 17-beta-oestradiol inhibited the uptake of all three compounds by rat heart, a finding consistent with extraneuronal uptake (uptake2). 3 [131I]-RIBA was injected intravenously into pigs and monkeys (M. speciosus). Myocardial samples taken from pigs killed 1 and 2 h after injection showed significant uptake. No significant uptake was found in myocardial samples of monkeys killed 10 min, 2 h and 24 h, respectively, after injection. 4 Four normal human volunteers received [125I]-RIBA intravenously and the image of the precordial area was followed by means of scintillation camera for the first 4 h after injection. In two of the subjects, the scintigrams were repeated at 22 and 23 h after injection, respectively. No evidence of myocardial uptake was observed. 5 These results suggest the possibility that man and at least one other primate species may differ from lower species with regard to uptake.
mesh_terms: D000328:Adult; D000818:Animals; D001949:Bretylium Compounds / Q000378:metabolism*; D005260:Female; D000882:Haplorhini; D006801:Humans; D066298:In Vitro Techniques; D007462:Iodobenzenes / Q000378:metabolism; D008251:Macaca; D008297:Male; D009206:Myocardium / Q000378:metabolism*; D009638:Norepinephrine / Q000378:metabolism; D051381:Rats; D013045:Species Specificity; D013552:Swine
chemical_list: D001949:Bretylium Compounds; D007462:Iodobenzenes; C025210:iodobenzyltrimethylammonium; D009638:Norepinephrine