PMID- 7685865 OWN - NLM STAT- MEDLINE DCOM- 19930719 LR - 20190701 IS - 0304-3940 (Print) IS - 0304-3940 (Linking) VI - 152 IP - 1-2 DP - 1993 Apr 2 TI - Central inhibition of nitric oxide synthase preferentially augments release of oxytocin during dehydration. PG - 190-3 AB - Intracerebroventricular (i.c.v.) administration of NG-monomethyl-L-arginine monoacetate (NMMA; 500 micrograms; 402 mM) and NG-nitro-L-arginine methyl ester (NAME; 270 micrograms; 200 mM), inhibitors of nitric oxide synthase, enhanced the rise in oxytocin but not vasopressin levels in plasma of conscious rats following 24 h of water deprivation. This effect of NMMA occurred by 10 min after administration, reached its peak at 15 min and decreased by 20 min. Daily administration of lower doses (50 micrograms and 0.5 microgram/5 microliter, i.c.v.) of another inhibitor of nitric oxide synthase, NG-nitro-L-arginine, just before and after 24 h of water deprivation and in control animals treated similarly were without effect on either vasopressin or oxytocin levels. Nitric oxide, therefore, attenuates preferentially the release of oxytocin during dehydration. FAU - Summy-Long, J Y AU - Summy-Long JY AD - Department of Pharmacology, M.S. Hershey Medical Center, Pennsylvania State University, Hershey 17033. FAU - Bui, V AU - Bui V FAU - Mantz, S AU - Mantz S FAU - Koehler, E AU - Koehler E FAU - Weisz, J AU - Weisz J FAU - Kadekaro, M AU - Kadekaro M LA - eng GR - 2RO1.NS 23055/NS/NINDS NIH HHS/United States GR - HD RO1-25498/HD/NICHD NIH HHS/United States PT - Journal Article PT - Research Support, U.S. Gov't, P.H.S. PL - Ireland TA - Neurosci Lett JT - Neuroscience letters JID - 7600130 RN - 0 (Nerve Tissue Proteins) RN - 11000-17-2 (Vasopressins) RN - 27JT06E6GR (omega-N-Methylarginine) RN - 31C4KY9ESH (Nitric Oxide) RN - 50-56-6 (Oxytocin) RN - 94ZLA3W45F (Arginine) RN - EC 1.14.13.39 (Nitric Oxide Synthase) RN - EC 1.4.- (Amino Acid Oxidoreductases) RN - V55S2QJN2X (NG-Nitroarginine Methyl Ester) SB - IM MH - Amino Acid Oxidoreductases/*antagonists & inhibitors MH - Animals MH - Arginine/*analogs & derivatives/pharmacology MH - Dehydration/*physiopathology MH - Male MH - NG-Nitroarginine Methyl Ester MH - Nerve Tissue Proteins/*antagonists & inhibitors MH - Nitric Oxide/*metabolism MH - Nitric Oxide Synthase MH - Oxytocin/*metabolism MH - Paraventricular Hypothalamic Nucleus/drug effects/enzymology/metabolism MH - Pituitary Gland, Posterior/*drug effects/enzymology/metabolism MH - Rats MH - Rats, Sprague-Dawley MH - Supraoptic Nucleus/drug effects/enzymology/metabolism MH - Vasopressins/metabolism MH - omega-N-Methylarginine EDAT- 1993/04/02 00:00 MHDA- 1993/04/02 00:01 CRDT- 1993/04/02 00:00 PHST- 1993/04/02 00:00 [pubmed] PHST- 1993/04/02 00:01 [medline] PHST- 1993/04/02 00:00 [entrez] AID - 0304-3940(93)90515-M [pii] AID - 10.1016/0304-3940(93)90515-m [doi] PST - ppublish SO - Neurosci Lett. 1993 Apr 2;152(1-2):190-3. doi: 10.1016/0304-3940(93)90515-m.