Role of Substance P in Neutral Endopeptidase Modulation of Hypoxic Response of the Carotid Body
Role of Substance P in Neutral Endopeptidase Modulation of Hypoxic Response of the Carotid Body
复制标题
P物质在中性肽链内切酶调节颈动脉体缺氧反应中的作用
DOI:
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发表时间:
2002
期刊:
影响因子:
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通讯作者:
Nanduri R. Prabhakarb
中科院分区:
文献类型:
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作者:
G. Kumara;Yu Ru;Jeffrey L. Overholtb;Nanduri R. Prabhakarb
Carotid body expresses neutral endopeptidase (NEP)-like enzyme activity and phosphoramidon, an inhibitor of NEP augments sensory response of the carotid body to hypoxia (Kumar et al., 1990). NEP hydrolyzes substance P (SP) and methionine enkephalin (Met-ENK) in the nervous system. In the present study, we determined whether NEP hydrolyzes Met-ENK and SP in the carotid body and whether these peptides contribute to the phosphoramidon-induced potentiation of the sensory response to hypoxia. Experiments were performed on carotid bodies excised from anaesthetized adult cats. HPLC analysis showed that both SP and Met-ENK were hydrolyzed by the carotid body. Phosphoramidon (400 μM) markedly inhibited SP (−90%) but had only marginal effect on Met-ENK hydrolysis (−15%). Sensory responses of the carotid body in vitro to hypoxia (pO2, 68+6 mmHg) and SP ( 10 nmoles) were potentiated by phosphoramidon by ~80% and ~275% respectively (p·0.01). SP-receptor antagonist abolished phosphoramidon-induced potentiation of the sensory response to hypoxia as well as to SP. These results demonstrate that SP is a preferred substrate for NEP in the carotid body and SP plays a major role in the potentiation of the hypoxic response of the carotid body by phosphoramidon.
DOI:
10.1073/pnas.90.21.10041
发表时间:
1993
影响因子:
11.1
作者:
Prabhakar,NR;Cao,H;Lowe3rd,JA;Snider,RM
通讯作者:
Snider,RM
影响因子:
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作者:
Prabhakar,NR
通讯作者:
Prabhakar,NR
DOI:
10.1152/jappl.1987.63.4.1401
发表时间:
1987
期刊:
Journal of applied physiology (Bethesda, Md. : 1985)
影响因子:
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作者:
Sekizawa,K;Tamaoki,J;Nadel,JA;Borson,DB
通讯作者:
Borson,DB