Canine adrenal catecholamine response to VIP is blocked by PACAP-(6-27) in vivo

被引:13
作者
Gaspo, R
LaMarche, L
DeChamplain, J
Yamaguchi, N
机构
[1] UNIV MONTREAL, FAC PHARM, GRP RECH SYST NERVEUX AUTONOME, MONTREAL, PQ H3C 3J7, CANADA
[2] UNIV MONTREAL, FAC MED, DEPT PHYSIOL, MONTREAL, PQ H3C 3J7, CANADA
关键词
vasoactive intestinal peptide; pituitary adenylate cycl deactivating peptide; nifedipine; atropine; L-type calcium channel; adrenal gland; anesthetized dogs;
D O I
10.1152/ajpregu.1997.272.5.R1606
中图分类号
Q4 [生理学];
学科分类号
071003 ;
摘要
The goal of the present study was to characterize the adrenal catecholamine response to exogenous vasoactive intestinal peptide (VIP) in anesthetized dogs. We studied the potential involvement of mechanism(s) mediated by muscarinic receptors, L-type Ca2+ channels, VIP-ergic receptors, or pituitary adenylate cyclase-activating peptide (PACAP) receptors. The study consisted of five groups: a vehicle control group receiving VIP (5 mu g) in the presence of saline and four drug-treated groups receiving VIP (5 mu g) in the presence of either atropine (500 mu g), nifedipine (50 mu g), [Lys(1), Pro(2,5),Arg(3,4),Tyr(6)]VIP (50 mu g), or PACAP-(6-27) (50 mu g). All drugs were locally infused to the left adrenal gland. Plasma catecholamine concentrations were measured in adrenal venous and aortic blood by a high-pressure liquid chromatography-electrochemical method. In the control group, VIP produced a significant increase in adrenal catecholamine output. Neither atropine, nifedipine, nor [Lys(1),pro(2,5),Arg(3,4),Tyr(6)]-VIP significantly affected the medullary response to VIP. In the presence of PACAP-(6-27), however, the catecholamine response to VIP was attenuated by similar to 77% (P <0.05). The present study suggests that adrenal catecholamine secretion induced by exogenous VIP may be mediated by a PACAP-related mechanism, most probably through a PACAP type I receptor, in anesthetized dogs. The data also indicate that neither muscarinic receptors, VIP-ergic receptors, nor dihydropyridine-sensitive L-type Ca2+ channels are operative in the adrenal catecholamine response to exogenous VIP in vivo.
引用
收藏
页码:R1606 / R1612
页数:7
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