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논문 기본 정보

자료유형
학술대회자료
저자정보
Hong, Ki-Whan (Dept. of Pharmacology, Coll. Of Medicine, Pusan National University) Pyo, Kwang-Min (Dept. of Pharmacology, Coll. Of Medicine, Pusan National University) Yu, Sung-Sook (Dept. of Pharmacology, Coll. Of Medicine, Pusan National University) Rhim, Byung-Yong (Dept. of Pharmacology, Coll. Of Medicine, Pusan National University)
저널정보
한국응용약물학회 한국응용약물학회 춘계학술발표논문집 한국응용약물학회 1994년도 춘계학술대회 and 제3회 신약개발 연구발표회
발행연도
1994.1
수록면
287 - 287 (1page)

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In the present study, it was aimed to asses the possibility that calcitonin gene-related peptide (CGRP) released in response to transient hypotension may contribute to the reflex autoregulation of cerebral blood flow as a putative modulator. Changes in pial arterial diameter (mean, 33.0 ${\pm}$ 1.1 $\mu\textrm{m}$) with changes in systemic arterial blood pressure (mean, 101.9 ${\pm}$ 2.7 mmHg) were observed directly through a closed cranial window in anesthetized normotensive rats. Image of the pial vessels was captured with a stereoscope connected to a CCD video camera and the diameter was measured with a microscaler. In the capsaicin-treated rats (one day prior to experiment, 50 nmol capsaicin injected intracisternally), both vasodilater and vasoconstrictor responses evoked by a transient hypotension and the reverse of blood pressure were markedly attenuated or almost abolished. When changes in pial arterial diameter were plotted as a function of changes in blood pressure, the slopes of both regression lines (for vasodilators and vasoconstrictors ) were markedly reduced. Similar reductions were evidenced under treatment wi th the CGRP antibody serum (1:1,000) and following CGRP receptor desensitization. However, the autoregulatory mechanics were neither affected by treatment wi th spantide (1 ${\mu}$M), substance P antagonist, nor by substance P receptor desensitization. Suffusion wi th mock cerebrospinal fluid containing CGRP and cromakalim caused a vasodilatation in a concentration-dependent manner, respectively and their effects were antagonized by glibenclamide. Substance P produced a vasodilatation, which was, however, little affected by glibenclamide. These observations indicate that the CGRP released from the perivascular sensory fibers in response to a hypotension is implicated in the modulation of the autoregulation of cerebral blood flow.

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