title: The role of beta-1-adrenoceptors in the renin release response to graded renal sympathetic nerve stimulation.
abstract: The contribution of beta-adrenoceptor activation to renin release was examined in anaesthetized dogs using renal nerve stimulation (RNS) at different discharge rates in the presence of i.v. beta-adrenoceptor blockade. The animals were divided into 2 groups, which received either low or high level of RNS, defined by the frequency of stimulation producing decrease in renal blood flow of 5 and 50%, respectively. Low level RNS increased renin release tenfold. The renin release response was almost abolished by 0.5 mg/kg of metoprolol or dl-propranolol but unaffected by 0.5 mg/kg of d-propranolol. The increase in renin release to high level RNS was equally reduced by 33% by 0.5 mg/kg and 2.0 mg/kg of metoprolol. dl-propranolol, 0.5 mg/kg, reduced the renin release response to about the same extent, 44%, while 2.0 mg/kg reduced it somewhat more, 59%. This was probably due to its membrane stabilizing properties as d-propranolol, 2.0 mg/kg and lidocaine 2.0 mg/kg + 0.1 mg x kg-1 x min-1, also reduced the renin release response. These data suggest that the renin release response to low level RNS is almost completely mediated by beta-adrenoceptors which are of the beta-1 subtype. High level RNS results in a renin release, which is only partly mediated by beta-1-adrenoceptors. The remainder is apparently related to other mechanisms activated by high level RNS and is probably a consequence of the associated renal vasoconstriction.
mesh_terms: D000319:Adrenergic beta-Antagonists / Q000097:blood / Q000494:pharmacology; D000818:Animals; D004285:Dogs; D004558:Electric Stimulation; D005260:Female; D007668:Kidney / Q000294:innervation*; D008012:Lidocaine / Q000494:pharmacology; D008297:Male; D011941:Receptors, Adrenergic / Q000502:physiology*; D011943:Receptors, Adrenergic, beta / Q000502:physiology*; D012083:Renin / Q000378:metabolism*; D013564:Sympathetic Nervous System / Q000502:physiology
chemical_list: D000319:Adrenergic beta-Antagonists; D011941:Receptors, Adrenergic; D011943:Receptors, Adrenergic, beta; D008012:Lidocaine; D012083:Renin