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Type: Artigo de periódico
Title: Activation of renal pelvic chemoreceptors in rats: role of calcitonin gene-related peptide receptors
Author: Gontijo, JAR
Kopp, UC
Abstract: Substance P and calcitonin gene-related peptide (CGRP) increase afferent renal nerve activity (ARNA). A substance P receptor antagonist but not a CGRP receptor antagonist, h-CGRP (8-37), blocks the ARNA response to renal mechanoreceptor (MRI stimulation. We have examined whether calcitonin gene-related peptide activates renal pelvic sensory receptors and whether such activation contributes to renal chemoreceptor stimulation. The calcitonin gene-related peptide receptor antagonist, h-CGRP (8-37) [0.01-10 mu mol L-1] dose-dependently decreased (29 +/- 4-86 +/- 13%, P < 0.01) the ipsilateral afferent renal nerve activity in response to the renal pelvic administration of calcitonin gene-related peptide (0.26 mu mol L-1). Renal pelvic perfusion with 900 mM NaCl also increased ipsilateral ARNA (23 +/- 3% increase, P< 0.02) and contralateral urinary sodium excretion (13 +/- 4% increase, P < 0.05). However, these responses to hypertonic NaCl were unaltered by h-CGRP (8-37). Renal pelvic perfusion with 1 or 10 mu M h-CGRP (8-37) also failed to alter the ARNA responses to KCI (31.25, 62.5, and 125 mM). These results indicate that there are sensory receptors in the renal pelvic area that are responsive to calcitonin gene-related peptide. The activation of these receptors elicits a contralateral natriuretic response. In contrast, the activation of renal calcitonin gene-related peptide receptors does not contribute to renal chemoreceptor activation.
Subject: afferent renal nerve activity
calcitonin gene-related peptide
CGRP receptor antagonist
renal pelvic chemoreceptors
Country: Inglaterra
Editor: Blackwell Science Ltd
Rights: aberto
Date Issue: 1999
Appears in Collections:Unicamp - Artigos e Outros Documentos

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