Hypertension Research
Online ISSN : 1348-4214
Print ISSN : 0916-9636
ISSN-L : 0916-9636
Experimental studies
Regional Hemodynamic Effects of Adrenomedullin in Wistar Rats: a Comparison with Calcitonin Gene-Related Peptide
Junsuke KAWAIKatsuyuki ANDOTatsuo SHIMOSAWAKiyonori HARIIToshiro FUJITA
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2002 Volume 25 Issue 3 Pages 441-446

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Abstract

Because both vasodilation induced by adrenomedullin (AM) and that induced by calcitonin gene-related peptide (CGRP) may occur via the same receptor, the two peptides might play similar roles in circulation. To examine this possibility, we used the colored microsphere technique and an ultrasonic flowmeter to investigate the systemic and regional effects of an equivalent dose (650 pmol⁄l) of AM and CGRP in conscious Wistar rats. AM significantly decreased mean arterial pressure and peripheral resistance but increased heart rate and cardiac index (CI). On the other hand, hypotension induced by CGRP was not accompanied by an increment in CI. Both AM and CGRP increased the femoral arterial blood flow measured by the flowmeter, with the increase by AM being significantly larger. The regional hemodynamic effects were quite different between the two peptides. AM increased the blood flow in the heart, lungs, kidneys, adrenal glands, and spleen, whereas CGRP increased blood flow only in the heart. On the other hand, CGRP increased the cutaneous and gastric blood flows, which were not affected by AM. These differences in the regional vasodilatory effects of AM and CGRP suggest that the two peptides do not play similar roles in circulatory regulation. (Hypertens Res 2002; 25: 441-446)

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© 2002 by the Japanese Society of Hypertension
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