| Autor: |
Xin Qing, Keith, Ingegerd M. |
| Předmět: |
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| Zdroj: |
American Journal of Physiology: Lung Cellular & Molecular Physiology; Jul2003, Vol. 29 Issue 1, pL86, 11p, 12 Color Photographs, 32 Black and White Photographs, 16 Graphs |
| Abstrakt: |
We previously described the protection by calcitonin gene-related peptide (CGRP) against hypoxic pulmonary hypertension. Here, we examine the roles of its putative receptor RDC-1 and receptor activity-modifying protein (RAMP) 1 in mediating this protection by selectively inhibiting their synthesis. RAMP1 is an accessory protein for another putative CGRP receptor, calcitonin receptor-like receptor. Antisense oligodeoxyribonucleotides (ASODNs, 5 mg·kg[sup -1]·day[sup -1] or 5 and 10 mg·kg[sup -1]·day[sup -1] for RDC-1) targeting RAMP1 and RDC-1 mRNAs were chronically infused to the pulmonary circulation of male Sprague-Dawley rats during 7 days of normoxia or hypobaric hypoxia (380 mmHg), and α-CGRP ASODN was used as a technical control. CGRP, RAMP1, and RDC-1 ASODNs significantly elevated pulmonary artery pressure (P[sub PA]) in chronic hypoxic rats compared with hypoxic mismatched ASODN (MMODN) and saline vehicle controls. CGRP and RAMP1 ASODNs raised P[sub PA] in normoxic rats briefly exposed to 10% O[sub 2] above MMODN and saline controls. Moreover, normoxic rats treated with CGRP ASODN had higher basal pulmonary vascular tone compared with controls. These data confirm the protective role of CGRP in the pulmonary circulation and suggest that endogenous RAMP1 and RDC-1 are essential in regulation of P[sub PA] in hypoxia. This is the first in vivo evidence supporting RDC-1 and RAMP1 as functional CGRP receptor and receptor component. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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