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논문 기본 정보

자료유형
학술저널
저자정보
Youn, Doo-Sang (Department of Pharmacology, College of Medicine, Hanyang University) Shin, In-Chul (Department of Pharmacology, College of Medicine, Hanyang University)
저널정보
한국응용약물학회 The journal of applied pharmacology : the official journal of the Korean Society of Applied Pharmacology The journal of applied pharmacology : the official journal of the Korean Society of Applied Pharmacology 제13권 제1호
발행연도
2005.1
수록면
35 - 40 (6page)

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This study was performed to investigate the regulatory mechanism of cerebral blood flow of adenosine A$_{2B}$ receptor agonist in the rats, and to define whether its mechanism is mediated by adenylate cyclase, guanylate cyclase and potassium channel. In pentobarbital-anesthetized, pancuronium-paralyzed and artificially ventilated male Sprague-Dawley rats, all drugs were applied topically to the cerebral cortex. Blood flow from cerebral cortex was measured using laser-Doppler flowmetry. Topical application of an adenosine A$_{2B}$ receptor agonist, 5'-N-ethylcarboxamidoadenosine (NECA; 4 umol/I) increased cerebral blood flow. This effect of NECA (4 umol/I) was not blocked by pretreatment with adenylate cyclase inhibitor, MDL-12,330 (20 umol/I). But effect of NECA (4 umol/I) was blocked by pretreatment with guanylate cyclase inhibitor, LY-83,583 (10 umol/I) and pretreatment with ATP-sensitive potassium channel inhibitor, glipizide (5 umol/I). These results suggest that adenosine A$_{2B}$ receptor increases cerebral blood flow. It seems that this action of adenosine A$_{2B}$ receptor is mediated via the activation of guanylate cyclase and ATP-sensitive potassium channel in the cerebral cortex of the rats.

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