Effects of CGRP on baroreflex control of heart rate and renal sympathetic nerve activity in rabbits

H. Okamoto, S. Hoka, T. Kawasaki, M. Sato, J. Yoshitake

研究成果: Contribution to journalArticle査読

12 被引用数 (Scopus)

抄録

We examined the effects of intravenous infusion of calcitonin gene-related peptide (CGRP) and sodium nitroprusside (SNP) on baroreceptor afferent nerve activity, renal sympathetic efferent nerve activity (RSNA), and heart rate in α-chloralose-anesthetized rabbits. Baroreceptor afferent nerve activity was measured from aortic nerves during CGRP- and SNP-induced hypotension. Decreases in aortic nerve activity in response to decreases in mean arterial pressure were not different during CGRP and SNP infusion. Progressive infusion of CGRP (12-120 pmol · kg-1 · min-1) increased RSNA by 83 ± 14 (mean ± SE), 175 ± 26, 246 ± 36, and 343 ± 41%, and heart rate by 8 ± 2, 24 ± 3, 37 ± 4, and 47 ± 6 beats/min during falls of blood pressure of 5, 10, 15, and 20 mmHg, respectively. These increases in RSNA and heart rate produced by CGRP were significantly greater than those produced by SNP. The alterations in heart rate and RSNA with CGRP were reversed by restoring blood pressure with phenylephrine HCl. In rabbits with sinoaortic and vagal deafferentation, the responses of heart rate and RSNA to a fall of blood pressure were abolished during both CGRP and SNP infusion. Therefore, it is suggested that the facilitated responses of heart rate and RSNA during CGRP infusion occurred by way of the arterial baroreflex arc.

本文言語英語
ページ(範囲)R874-R879
ジャーナルAmerican Journal of Physiology - Regulatory Integrative and Comparative Physiology
263
4 32-4
DOI
出版ステータス出版済み - 1 1 1992

All Science Journal Classification (ASJC) codes

  • Physiology
  • Physiology (medical)

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