| Effect of the vascular endothelium on contractions induced by noradrenaline and phenylephrine in perforating branch of the human internal mammary artery. | |
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MedLine Citation:
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PMID: 14581717 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The effects of noradrenaline (Nor) and phenylephrine (Phe) on the isolated, non-precontracted perforating branch of the human internal mammary artery (HIMA) were investigated. Nor and Phe induced concentration-dependent contractions of intact and endothelium-denuded arterial rings with no statistically significant differences between the pEC(30) and maximal response values. The pretreatment of arterial rings with indomethacin had no effect on Nor- and Phe-induced contractions of both, intact and endothelium-denuded preparations. The pre-addition of L-NMMA did not affect contractions of perforating branch of the HIMA evoked by Nor, but provoked significant potentiation of Phe-induced contractions of perforating branch of the HIMA both intact and denuded of endothelium only at Phe concentration higher than 3 x 10(-6)M. The effects of selective alpha1-adrenoceptor antagonist, prazosin and selective alpha2-adrenoceptor antagonist, rauwolscine were concentration-dependent, and they induced a significant shift to the right (for both studied antagonists) of the concentration-response curves for Nor in both preparations with or without endothelium. The effects of prazosin and rauwolscine on the concentration-response curves for Phe were similar. In conclusion, this study has shown that Nor and Phe induce concentration-dependent contractions of the perforating branch of the HIMA. Removal of the endothelium did not modify this effect. Products of cyclooxygenase pathway had no influence on Nor and Phe action. Endothelium derived nitric oxide (NO) had no modulatory effect of Nor-induced contractions, but inhibition of NO synthesis provoked potentiation of Phe-induced contractions either in intact or endothelium-denuded preparations. The mechanism of this effect remains still unclear. On the basis of differential affinity of the antagonists and affinities of Nor and Phe themselves, we suggest that alpha1-adrenoceptor subtype is probably involved in the Nor- and Phe-induced contraction of the perforating branch of the HIMA both intact or denuded of endothelium. |
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Authors:
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Srdan Pesić; Leposava Grbović; Aleksandar Jovanović; Miroslav Radenković; Dragica Stojić |
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Publication Detail:
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Type: Comparative Study; In Vitro; Journal Article |
Journal Detail:
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Title: Polish journal of pharmacology Volume: 55 ISSN: 1230-6002 ISO Abbreviation: Pol J Pharmacol Publication Date: 2003 Jul-Aug |
Date Detail:
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Created Date: 2003-10-28 Completed Date: 2004-08-06 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 9313882 Medline TA: Pol J Pharmacol Country: Poland |
Other Details:
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Languages: eng Pagination: 581-93 Citation Subset: IM |
Affiliation:
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Department of Pharmacology, Medical Faculty, 81 Braće Tasković, 18000 Nis, Yugoslavia. srdjan@medfak.ni.ac.yu |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adrenergic alpha-Antagonists
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pharmacology Adult Dose-Response Relationship, Drug Endothelium, Vascular / physiology* Enzyme Inhibitors / pharmacology Female Humans Indomethacin / pharmacology Mammary Arteries / drug effects*, physiology Middle Aged Nitric Oxide Synthase / antagonists & inhibitors Norepinephrine / pharmacology* Phenylephrine / pharmacology* Prazosin / pharmacology Vasoconstriction / drug effects* Vasoconstrictor Agents / pharmacology* Yohimbine / pharmacology omega-N-Methylarginine / pharmacology |
| Chemical | |
Reg. No./Substance:
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0/Adrenergic alpha-Antagonists; 0/Enzyme Inhibitors; 0/Vasoconstrictor Agents; 146-48-5/Yohimbine; 17035-90-4/omega-N-Methylarginine; 19216-56-9/Prazosin; 51-41-2/Norepinephrine; 53-86-1/Indomethacin; 59-42-7/Phenylephrine; EC 1.14.13.39/Nitric Oxide Synthase |
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