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
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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
Nanduri R. Prabhakarb
中科院分区:
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文献类型:
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作者:
G. Kumara;Yu Ru;Jeffrey L. Overholtb;Nanduri R. Prabhakarb

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颈动脉体表达中性内肽酶(NEP)样酶活性,并且NEP的抑制剂phosphoramidon增强颈动脉体对缺氧的感觉反应(Kumar等人,1990年)。NEP水解神经系统中的P物质(SP)和甲硫氨酸脑啡肽(Met-ENK)。在本研究中,我们确定NEP是否水解颈动脉体中的Met-ENK和SP,以及这些肽是否有助于磷酰胺诱导的缺氧感觉反应增强。实验在麻醉成年猫颈动脉体上进行。HPLC分析表明SP和Met-ENK均被颈动脉体水解。Phosphoramidon(400 μM)可显著抑制SP(−90%),但对Met-ENK水解仅有轻微影响(−15%)。离体颈动脉体对缺氧(pO 2,68 ± 6 mmHg)和SP(10 nmol)的感觉反应分别被磷酰胺增强约80%和约275%(p·0.01)。SP-受体拮抗剂废除磷酰胺诱导的增强的感觉反应,缺氧,以及SP。这些结果表明,SP是一个优选的基板NEP在颈动脉体和SP起着重要的作用,在增强的缺氧反应的颈动脉体磷酰胺。
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.
P 物质受体拮抗剂 CP-96,345 选择性抑制颈动脉体对缺氧的感觉反应。
DOI: 10.1073/pnas.90.21.10041
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影响因子: 11.1
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颈动脉体中的神经递质。
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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: --
作者:
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