8-OH-DPAT attenuates isoproterenol- but not forskolin-stimulated accumulation of cAMP in mediobasal hypothalamus.
Ovariectomized female rats were used to test the possibility that the 5-HT(1A) receptor agonist, 8-hydroxy-2-(di-N-propylamino) tetralin (8-OH-DPAT), inhibits cyclic AMP (cAMP) accumulation in the mediobasal hypothalamus. Tissue slices were incubated with forskolin or with the beta-adrenergic receptor agonist, isoproterenol, to stimulate accumulation of cAMP. Both compounds increased accumulation of cAMP. The 5-HT(1A) receptor agonist, 8-OH-DPAT, reduced cAMP accumulation after stimulation by isoproterenol, but not after forskolin stimulation. These findings are discussed in terms of putative differences in the mechanisms whereby 5-HT(1A) receptors are able to inhibit stimulation of adenylate cyclase. The potential significance of these findings to 5-HT(1A) receptor-mediated inhibition of female rat lordosis behavior is also discussed.
Majumdar
Devi
D
Department of Biology, Texas Woman's University, Denton, TX 76204, USA.
Peterson-Ford
Angela
A
Uphouse
Lynda
L
D017371:8-Hydroxy-2-(di-n-propylamino)tetralin / Q000494:pharmacology*; D000818:Animals; D005576:Colforsin / Q000494:pharmacology*; D000242:Cyclic AMP / Q000037:antagonists & inhibitors / Q000378:metabolism*; D005260:Female; D007031:Hypothalamus / Q000187:drug effects / Q000378:metabolism*; D066298:In Vitro Techniques; D007545:Isoproterenol / Q000494:pharmacology*; D051381:Rats; D011916:Rats, Inbred F344
D005576:Colforsin; D017371:8-Hydroxy-2-(di-n-propylamino)tetralin; D000242:Cyclic AMP; D007545:Isoproterenol