PMID- 2620188 OWN - NLM STAT- MEDLINE DCOM- 19900326 LR - 20161018 IS - 0100-879X (Print) IS - 0100-879X (Linking) VI - 22 IP - 6 DP - 1989 TI - Participation of the serotonergic system in the regulation of water and electrolyte balance. PG - 761-3 AB - To determine the possible participation of the serotonergic (5-HT) system in the regulation of water and electrolyte balance, rats were submitted to two sessions of water overloading and the 5-HT agonist MK 212 was administered intracerebroventricularly (icv) in 1.0 microliters 20 min after the second session. Urine volume and sodium and potassium excretion were then measured over a period of 120 min. Microinjection of MK-212 (1 micrograms/animal) caused a significant reduction (24 to 57%; mean, 43%) in natriuresis throughout the experimental period, and the administration of 10 micrograms/animal caused a 26-41% reduction (mean, 33%) in kaliuresis. At 20 micrograms/animal, MK-212 did not change any of the parameters investigated. No significant change in urine volume was detected after any of the treatments used. FAU - Reis, L C AU - Reis LC AD - Departamento de Fisiologia, Faculdade de Medicina de Ribeirao Preto, Universidade de Sao Paulo, Brasil. FAU - Ramalho, M J AU - Ramalho MJ FAU - Antunes-Rodrigues, J AU - Antunes-Rodrigues J LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't PL - Brazil TA - Braz J Med Biol Res JT - Brazilian journal of medical and biological research = Revista brasileira de pesquisas medicas e biologicas JID - 8112917 RN - 0 (Pyrazines) RN - 059QF0KO0R (Water) RN - 62C3N7238U (6-chloro-2-(1-piperazinyl)pyrazine) RN - 9NEZ333N27 (Sodium) RN - RWP5GA015D (Potassium) SB - IM MH - Animals MH - Injections, Intraventricular MH - Microinjections MH - Potassium/urine MH - Pyrazines/administration & dosage/*pharmacology MH - Rats MH - Rats, Inbred Strains MH - Sodium/urine MH - Water MH - Water-Electrolyte Balance/*drug effects EDAT- 1989/01/01 00:00 MHDA- 1989/01/01 00:01 CRDT- 1989/01/01 00:00 PHST- 1989/01/01 00:00 [pubmed] PHST- 1989/01/01 00:01 [medline] PHST- 1989/01/01 00:00 [entrez] PST - ppublish SO - Braz J Med Biol Res. 1989;22(6):761-3.