Affiliation:
1. Department of Neurology, School of Medicine, Keio University, Tokyo, Japan.
Abstract
We evaluated the effects of cilostazol, a selective inhibitor of cyclic adenosine monophosphate phosphodiesterase, on the pial vessels of adult cats subjected to endothelial damage followed by middle cerebral artery occlusion. Six cats were treated with cilostazol and four with 30% N,N-dimethylformamide in 70% saline (solvent). The brain surface was irradiated with ultraviolet rays through a cranial window for 3 minutes to selectively damage the endothelium of the pial vessels in both groups. Beginning 32 minutes after termination of the irradiation, the middle cerebral artery was occluded for 30 minutes. Thirty minutes before occlusion, intravenous infusion of 30 micrograms/kg/min cilostazol or 0.1 ml/kg/min solvent was begun and continued until the end of the study. Before occlusion, the infusion of cilostazol induced a significant (p less than 0.05) dilatation while the infusion of solvent produced no significant changes in the diameter of the pial arteries. The pial veins of solvent-treated cats showed significant (p less than 0.05) constriction during occlusion, whereas cilostazol-treated cats exhibited only mild constriction of the pial veins. The formation of platelet thrombi after occlusion was significantly (p less than 0.05) inhibited in the pial veins of cilostazol-treated compared with solvent-treated cats. Similarly, the microcirculation of the pial veins was effectively restored after reopening of the middle cerebral artery in cilostazol-treated compared with solvent-treated cats. Our data suggest that cilostazol is an effective antithrombotic agent as well as a potent vasodilator acting on vascular smooth muscle.
Publisher
Ovid Technologies (Wolters Kluwer Health)
Subject
Advanced and Specialised Nursing,Cardiology and Cardiovascular Medicine,Clinical Neurology
Reference27 articles.
1. Evidence that calcium regulates platelet function;Detwiler TC;Thromb Haemost,1978
2. Jones HP: Calmodulin and platelet function in Longenecker GL (ed): The Platelets: Physiology and Pharmacology. Orlando Fla Academic Press 1985 pp 221-235
3. Ca2+ mobilization in blood platelets as visualized by chlortetracycline fluorescence;Owen NE;Am J Physiol,1981
4. Phillips DR Parise LV Fitzgerald LA Fox JEB: Calcium regulation of platelet membrane and cytoskeletal proteins in Oates JA Hawiger J Ross R (eds): Interaction of Platelet With the Vessel Wall. Bethesda Md American Physiological Society 1985 pp 21-33
5. Cytoplasmic free Ca2+in human platelets: Ca2+thresholds and Ca-independent activation for shape-change and secretion
Cited by
82 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献