PMID- 7200039 OWN - NLM STAT- MEDLINE DCOM- 19820614 LR - 20190721 IS - 0014-4819 (Print) IS - 0014-4819 (Linking) VI - 46 IP - 1 DP - 1982 TI - In vivo GABA release from the medial preoptic area of diestrous and ovariectomized rats. PG - 69-72 AB - The push-pull cannula technique was used to examine the endogenous release of GABA from the medial preoptic area (MPO) of unanesthetized rats. In diestrous females the mean resting release of GABA was 27.1 +/- 2.0 pmol/min. GABA release was significantly elevated by increasing the potassium concentration in the perfusion solution to 50 mM, whereas it was dramatically inhibited by mercaptoproprionic acid (1.0 mM), a glutamic acid decarboxylase inhibitor. A comparison between diestrous females and chronically castrated animals indicated that endogenous GABA release in OVX animals was only 60-70% of that in diestrous animals. A model for the presynaptic inhibition of NE by estrogen receptive GABAergic neurons in the MPO is proposed. FAU - Ondo, J AU - Ondo J FAU - Mansky, T AU - Mansky T FAU - Wuttke, W AU - Wuttke W LA - eng GR - HD 00248/HD/NICHD NIH HHS/United States PT - Journal Article PT - Research Support, Non-U.S. Gov't PT - Research Support, U.S. Gov't, P.H.S. PL - Germany TA - Exp Brain Res JT - Experimental brain research JID - 0043312 RN - 56-12-2 (gamma-Aminobutyric Acid) RN - 9002-67-9 (Luteinizing Hormone) SB - IM MH - Animals MH - *Castration MH - *Diestrus MH - *Estrus MH - Female MH - Hypothalamus/*metabolism MH - Luteinizing Hormone/blood MH - Pregnancy MH - Preoptic Area/*metabolism MH - Rats MH - Rats, Inbred Strains MH - gamma-Aminobutyric Acid/*metabolism EDAT- 1982/01/01 00:00 MHDA- 1982/01/01 00:01 CRDT- 1982/01/01 00:00 PHST- 1982/01/01 00:00 [pubmed] PHST- 1982/01/01 00:01 [medline] PHST- 1982/01/01 00:00 [entrez] AID - 10.1007/BF00238099 [doi] PST - ppublish SO - Exp Brain Res. 1982;46(1):69-72. doi: 10.1007/BF00238099.