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논문 기본 정보

자료유형
학술대회자료
저자정보
Park, Mi-Sun (Department of Pharmacology, College of Pharmacy, Pusan National University) Hong, Eun-Ju (Department of Pharmacology, College of Pharmacy, Pusan National University) Hong, Sung-Cheul (Department of Pharmacology, College of Pharmacy, Pusan National University)
저널정보
한국응용약물학회 한국응용약물학회 춘계학술발표논문집 한국응용약물학회 1996년도 춘계학술대회
발행연도
1996.1
수록면
217 - 217 (1page)

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The putative role of vasoactive intestinal polypeptide (VIP) as non-adrenergic non-cholinergic (NANC) neurotransmitter has been studied in rabbit corpus cavernosum. In the presence of atropine and guanethidine the short and prolonged electrical field stimulation (EFS, 2~16 ㎐) induced a frequency-dependent relaxation which was abolished by tetrodotoxin (0.3 ${\mu}$M), a nerve conductance blocker. The neurogenic relaxant reponses were not affected in the presence of VIP-inactivating peptidase, ${\alpha}$-chymotrypsin (2 units/$m\ell$), whereas VIP-induced relaxation were completely abolished. Inhibition of nitric oxide synthase by N$\^$G/-nitro-L-arginine (10~100 ${\mu}$M) caused concentration-dependent inhibition to the neurogenic relaxant responses and at 100 ${\mu}$M the relaxations were virtually abolished. In contrast NO (3~30 ${\mu}$M) and VIP (0.001~l ${\mu}$M)-induced relaxation were unaffected. The inhibitory effect of L-NNA was reversed in the presence of L-arginine (5 mM), the precursor of the NO biosynthesis. Hemog1obin (20~60 ${\mu}$M), sequestering NO in the extracellular space, abolished the NO-evoked relaxation and also caused a concentration-dependent inhibition to the neurogenic relaxation. These observation indicate that NANC relaxation induced by prolonged EFS of rabbit corpus cavernosum is also mediated mainly by nitric oxide as same as that of short EFS, and suggest that VIP is not involved in NANC relaxation of rabbit corpus cavernosum and NO would not be produced by VIP in this tissue.

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