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  • Title: Roles of accumulated endogenous nitric oxide synthase inhibitors and decreased nitric oxide synthase activity for impaired trigonal relaxation with ischemia.
    Author: Masuda H, Yano M, Sakai Y, Kihara K, Goto M, Azuma H.
    Journal: J Urol; 2003 Oct; 170(4 Pt 1):1415-20. PubMed ID: 14501780.
    Abstract:
    PURPOSE: We examined whether endogenous nitric oxide (NO) synthase (NOS) inhibitors are involved in the impaired trigonal relaxation with ischemia in rabbits. MATERIALS AND METHODS: Rabbits were divided into control and ischemia groups. Two weeks after partial vessel occlusion strips of trigone and detrusor were processed to determine endogenous methylarginines and L-arginine by automated high performance liquid chromatography. We also compared NOS activity and NO mediated functional responses to electrical field stimulation between 2 groups. RESULTS: Neurogenic and NO but not sodium nitroprusside induced mediated relaxation in the trigone were significantly impaired following ischemia. Ca2+ dependent NOS activity, and baseline and stimulated cyclic guanosine monophosphate production with electrical field stimulation were significantly decreased following ischemia. The contents of L-NMMA (NG-monomethyl-L-arginine) and asymmetrical ADMA (NG, NG-dimethyl-L-arginine) but not L-arginine or symmetrical SDMA (NG, N'G-dimethyl-L-arginine) were increased in the trigone following ischemia. Authentic L-NMMA and ADMA but not SDMA inhibited neurogenic relaxations in a concentration dependent manner without affecting the relaxation produced by sodium nitroprusside in control tissue. Excess L-arginine abolished L-NMMA and ADMA inhibition. CONCLUSIONS: These results suggest that impaired NO mediated trigonal relaxation following ischemia is closely related to decreased NOS activity and the increased accumulation of L-NMMA and ADMA.
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