Is glandular formation of nitric oxide a prerequisite for muscarinic secretion of fructose in the guinea-pig seminal vesicle?
Urol Res 1997;25(6):433-8 Unique Identifier : MEDLINE 98103891 Ehren I; Sjostrand NO; Hammarstrom M; Wiklund NP; Department of Urology, Karolinska Hospital, Stockholm, Sweden.
Abstract:
The significance of nitric oxide (NO) formation in seminal secretion was studied in guinea-pig seminal vesicles. The nitric oxide synthase (NOS) activity was estimated and reduced nicotinamide-adenine dinucleotide phosphate (NADPH)-diaphorase histochemistry was performed. Furthermore, cyclic guanosine 3,5-monophosphate (cGMP) concentration as well as fructose secretion from isolated vesicles was estimated. High Ca2+-dependent NOS activity as well as prominent glandular NADPH- diaphorase staining was found in the secretory epithelium. The NOS inhibitors N(G)-nitro L-arginine methyl ester (L-NAME) and N(G)-nitro L- arginine (L-NNA) inhibited carbachol-induced fructose secretion but the D-isomer to L-NAME had no effect. When L-arginine was administered together with L-NAME, no inhibitory effect on the carbachol-induced fructose secretion could be seen. Nerve-induced fructose secretion was also inhibited by L-NAME. The NO donor glyceryl trinitrate (GTN) increased the fructose secretion. Carbachol or GTN did not increase cGMP levels, nor was fructose secretion inhibited by a guanylate cyclase inhibitor (ODQ). Our results suggests that glandular NO production is a prerequisite for muscarinic fructose secretion in the seminal vesicle via a cGMP-independent pathway.
Keywords: JOURNAL ARTICLE Animal Carbachol/pharmacology Cyclic GMP/metabolism Fructose/*secretion Guanylate Cyclase/metabolism Guinea Pigs Histocytochemistry In Vitro Male Muscarinic Agonists/pharmacology Nitric Oxide/*biosynthesis Nitric-Oxide Synthase/metabolism Receptors, Muscarinic/*metabolism Seminal Vesicles/enzymology/innervation/metabolism/*secretion Support, Non-U.S. Gov't
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