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Modulation of vasoactive intestinal polypeptide (VIP)-mediated relaxation by nitric oxide and prostanoids in the rabbit corpus cavernosum.
J Urol. 1995 Mar; 153(3 Pt 1):807-10.JU

Abstract

The polypeptide VIP has been proposed as an inhibitory nonadrenergic, noncholinergic (NANC) neurotransmitter involved in the relaxation of cavernosal smooth muscle during erection. However, the specific mechanism(s) by which VIP exerts its effect is unknown. To determine whether VIP is involved in NANC-mediated cavernosal relaxation, strips of corpus cavernosum from New Zealand White rabbits were hung in tissue baths; atropine and guanethidine were added to block cholinergic and adrenergic neurotransmission, respectively. The tissue was then submaximally precontracted with norepinephrine (NE) and relaxed by electrical field stimulation (EFS; 10 V square waves, 0.5 msec. duration, 10 second trains at 5, 15 and 40 Hz) before and after preincubation with the VIP antagonist, VIP 10-28. To evaluate the role of nitric oxide (NO) and prostaglandins on the relaxant effect of VIP in the corpus cavernosum, the strips were contracted with NE and subsequently relaxed with cumulative doses of VIP (10(-10) to 10(-6) M.). After VIP dose-response curves were obtained, the strips were preincubated with N omega-nitro-L-arginine (NOARG, an inhibitor of nitric oxide synthase, 10(-4) M.) and the VIP dose-response curve was repeated. Indomethacin (10(-5) M.) was added to one-half of the NOARG treated strips to inhibit prostaglandin synthesis. VIP 10-28 inhibited EFS-induced relaxation (p < 0.05) and produced dose-dependent relaxation, which was inhibited by NOARG (p < 0.05). In contrast, the VIP-induced relaxation was more pronounced in the presence of indomethacin (p < 0.05). Moreover, indomethacin substantially reversed the NOARG inhibition of VIP relaxation (p < 0.05). These results suggest that VIP is a mediator of NANC cavernosal relaxation and that NO synthesis is involved in VIP-induced NANC relaxation in the corpus cavernosum. In addition, the presence of vasoconstrictive prostanoids modulates this VIP-mediated NANC relaxation. Therefore, VIP appears to contribute to NANC neurally mediated cavernosal relaxation, and its mechanisms of relaxation are dependent on prostanoid and involve the generation of NO.

Authors+Show Affiliations

Sexual Dysfunction Laboratory, Duke University Medical Center, Durham, North Carolina.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, P.H.S.

Language

eng

PubMed ID

7861544

Citation

Kim, Y C., et al. "Modulation of Vasoactive Intestinal Polypeptide (VIP)-mediated Relaxation By Nitric Oxide and Prostanoids in the Rabbit Corpus Cavernosum." The Journal of Urology, vol. 153, no. 3 Pt 1, 1995, pp. 807-10.
Kim YC, Kim JH, Davies MG, et al. Modulation of vasoactive intestinal polypeptide (VIP)-mediated relaxation by nitric oxide and prostanoids in the rabbit corpus cavernosum. J Urol. 1995;153(3 Pt 1):807-10.
Kim, Y. C., Kim, J. H., Davies, M. G., Hagen, P. O., & Carson, C. C. (1995). Modulation of vasoactive intestinal polypeptide (VIP)-mediated relaxation by nitric oxide and prostanoids in the rabbit corpus cavernosum. The Journal of Urology, 153(3 Pt 1), 807-10.
Kim YC, et al. Modulation of Vasoactive Intestinal Polypeptide (VIP)-mediated Relaxation By Nitric Oxide and Prostanoids in the Rabbit Corpus Cavernosum. J Urol. 1995;153(3 Pt 1):807-10. PubMed PMID: 7861544.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Modulation of vasoactive intestinal polypeptide (VIP)-mediated relaxation by nitric oxide and prostanoids in the rabbit corpus cavernosum. AU - Kim,Y C, AU - Kim,J H, AU - Davies,M G, AU - Hagen,P O, AU - Carson,C C,3rd PY - 1995/3/1/pubmed PY - 2001/3/28/medline PY - 1995/3/1/entrez SP - 807 EP - 10 JF - The Journal of urology JO - J Urol VL - 153 IS - 3 Pt 1 N2 - The polypeptide VIP has been proposed as an inhibitory nonadrenergic, noncholinergic (NANC) neurotransmitter involved in the relaxation of cavernosal smooth muscle during erection. However, the specific mechanism(s) by which VIP exerts its effect is unknown. To determine whether VIP is involved in NANC-mediated cavernosal relaxation, strips of corpus cavernosum from New Zealand White rabbits were hung in tissue baths; atropine and guanethidine were added to block cholinergic and adrenergic neurotransmission, respectively. The tissue was then submaximally precontracted with norepinephrine (NE) and relaxed by electrical field stimulation (EFS; 10 V square waves, 0.5 msec. duration, 10 second trains at 5, 15 and 40 Hz) before and after preincubation with the VIP antagonist, VIP 10-28. To evaluate the role of nitric oxide (NO) and prostaglandins on the relaxant effect of VIP in the corpus cavernosum, the strips were contracted with NE and subsequently relaxed with cumulative doses of VIP (10(-10) to 10(-6) M.). After VIP dose-response curves were obtained, the strips were preincubated with N omega-nitro-L-arginine (NOARG, an inhibitor of nitric oxide synthase, 10(-4) M.) and the VIP dose-response curve was repeated. Indomethacin (10(-5) M.) was added to one-half of the NOARG treated strips to inhibit prostaglandin synthesis. VIP 10-28 inhibited EFS-induced relaxation (p < 0.05) and produced dose-dependent relaxation, which was inhibited by NOARG (p < 0.05). In contrast, the VIP-induced relaxation was more pronounced in the presence of indomethacin (p < 0.05). Moreover, indomethacin substantially reversed the NOARG inhibition of VIP relaxation (p < 0.05). These results suggest that VIP is a mediator of NANC cavernosal relaxation and that NO synthesis is involved in VIP-induced NANC relaxation in the corpus cavernosum. In addition, the presence of vasoconstrictive prostanoids modulates this VIP-mediated NANC relaxation. Therefore, VIP appears to contribute to NANC neurally mediated cavernosal relaxation, and its mechanisms of relaxation are dependent on prostanoid and involve the generation of NO. SN - 0022-5347 UR - https://www.unboundmedicine.com/medline/citation/7861544/Modulation_of_vasoactive_intestinal_polypeptide__VIP__mediated_relaxation_by_nitric_oxide_and_prostanoids_in_the_rabbit_corpus_cavernosum_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0022-5347(01)67727-9 DB - PRIME DP - Unbound Medicine ER -