Endothelium-independent potentiating effects of neuropeptide Y in the rat tail artery

The role of the endothelium in the potentiating action of neuropeptide Y (NPY) to contraction induced by KCl, α,β-methylene ATP (mATP), and noradrenaline (NA) was tested on rat tail arteries. Endothelium-intact and denuded ring segments and freshly isolated single smooth muscle cells were used in th...

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Veröffentlicht in:European journal of pharmacology 1992-01, Vol.210 (2), p.131-136
Hauptverfasser: Small, Daniel L., Bolzon, Bradley J., Cheung, Donald W.
Format: Artikel
Sprache:eng
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Zusammenfassung:The role of the endothelium in the potentiating action of neuropeptide Y (NPY) to contraction induced by KCl, α,β-methylene ATP (mATP), and noradrenaline (NA) was tested on rat tail arteries. Endothelium-intact and denuded ring segments and freshly isolated single smooth muscle cells were used in the study. Contraction responses to KCl and mATP were potentiated by NPY (50 nM) in both intact and denuded arteries. Contraction to NA was potentiated by NPY at 500 nM but not at 50 nM. The potentiation effect of NPY was antagonized by nifedipine. Similarly, the shortening of single smooth muscle cells in response to KCl and mATP was potentiated by NPY (50 nM). The noradrenaline response was potentiated by NPY at 500 nM but not at 50 nM. Our results suggest that the potentiating effect of NPY is more specific to contraction mediated by nifedipine-sensitive calcium channels and is not dependent on the presence of an intact endothelium.
ISSN:0014-2999
1879-0712
DOI:10.1016/0014-2999(92)90663-O