| Protection by nicorandil against the dysfunction of the central vagal baroreflex system following transient global cerebral ischaemia in dogs. | |
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MedLine Citation:
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PMID: 8401937 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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1. A possible cerebroprotective effect of nicorandil was investigated in a canine model of 5 min global cerebral ischaemia, and compared with protective effects of nitroglycerin and nicardipine. 2. Cerebral ischaemia was produced by occlusion of the left subclavian and the brachiocephalic arteries with preceding ligation of the intercostal arteries. The decrease in baroreflex sensitivity (BRS), measured by phenylephrine-induced reflex bradycardia, was used to assess the cerebroprotective effect. 3. Nicorandil (10 or 30 micrograms kg-1 min-1, i.v.), nitroglycerin (3 micrograms kg-1 min-1, i.v.) or nicardipine (0.3 micrograms kg-1 min-1, i.v.) were infused for 60 min just before ischaemia. Nitroglycerin and nicardipine decreased mean arterial blood pressure to an extent similar to that induced by the lower dose of nicorandil. Blood flow in the dorsal medulla oblongata was increased by nicorandil and nicardipine, but not by nitroglycerin. 4. Nicorandil at both doses and nitroglycerin prevented the post-ischaemic decrease in BRS. In these cases, bilateral vagotomy during the reperfusion period decreased BRS, indicating that the vagal component of BRS was protected from ischaemia. On the other hand, nicardipine failed to exert a cerebroprotective effect. 5. The present study suggests that nicorandil may possess a direct cerebroprotective effect and that its property as a nitrate might, at least in part, be important for the observed cerebral protection. |
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Authors:
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J Kurihara; N Ochiai; H Kato |
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Publication Detail:
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Type: Comparative Study; Journal Article |
Journal Detail:
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Title: British journal of pharmacology Volume: 109 ISSN: 0007-1188 ISO Abbreviation: Br. J. Pharmacol. Publication Date: 1993 Aug |
Date Detail:
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Created Date: 1993-11-02 Completed Date: 1993-11-02 Revised Date: 2009-11-18 |
Medline Journal Info:
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Nlm Unique ID: 7502536 Medline TA: Br J Pharmacol Country: ENGLAND |
Other Details:
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Languages: eng Pagination: 1263-7 Citation Subset: IM |
Affiliation:
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Department of Pharmacology, Faculty of Pharmaceutical Sciences, Teikyo University, Kanagawa, Japan. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Animals Aorta, Thoracic / physiology Blood Pressure / drug effects Cerebrovascular Circulation / drug effects Dogs Female Heart Rate / drug effects Ischemic Attack, Transient / physiopathology* Male Niacinamide / analogs & derivatives*, pharmacology Nicardipine / pharmacology Nicorandil Nitroglycerin / pharmacology Pressoreceptors / drug effects, physiology* Reflex / drug effects, physiology* Stereotaxic Techniques Vagus Nerve / physiology* Vasodilator Agents / pharmacology* |
| Chemical | |
Reg. No./Substance:
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0/Vasodilator Agents; 55-63-0/Nitroglycerin; 55985-32-5/Nicardipine; 65141-46-0/Nicorandil; 98-92-0/Niacinamide |
| Comments/Corrections | |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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