5-hydroxytryptamine1A receptor-mediated effects on adenylate cyclase and nitric oxide synthase activities in rat ventral prostate.
The rat ventral prostate possesses specific 5-hydroxytryptamine (5-HT1A) receptors coupled to adenylate cyclase. In vivo treatment of rats or in vitro preincubation of minced prostatic tissue with the 5-HT1A receptor agonist 8-hydroxy-2-(di-N-propylamino)-tetralin (8-OH-DPAT) in different experimental conditions shows the possibility of desensitisation mechanisms with switching from inhibitory to stimulatory pattern on adenylate cyclase activity. As in the majority of systems, we observed the inhibition of forskolin-stimulated adenylate cyclase activity as a functional correlate of 5-HT1A receptor activation. A similar feature occurred when the direct stimulation of the enzyme by the diterpene was replaced by a receptor-mediated activation with the neuropeptide vasoactive intestinal peptide. Furthermore, 8-OH-DPAT stimulated nitric oxide synthase (NOS) activity in a dose-dependent manner. Thus, serotonin appears to be able to act in the rat prostate gland through specific 5-HT1A receptors coupled to a complex system of signal transduction involving an inhibitory response of adenylate cyclase that can become stimulatory, as well as an enhancement of NOS activity.
Carmena
M J
MJ
Departamento de Bioquímica y Biología Molecular, Universidad de Alcalá, Alcalá de Henares, Spain. bqmjc@bioqui.alcala.es
Camacho
A
A
Solano
R M
RM
Montalvo
L
L
Garcia-López
E
E
Arias
A
A
Prieto
J C
JC
D017371:8-Hydroxy-2-(di-n-propylamino)tetralin / Q000494:pharmacology; D000262:Adenylyl Cyclases / Q000378:metabolism*; D000818:Animals; D005576:Colforsin / Q000494:pharmacology; D066298:In Vitro Techniques; D008297:Male; D019001:Nitric Oxide Synthase / Q000378:metabolism*; D011467:Prostate / Q000187:drug effects / Q000378:metabolism*; D051381:Rats; D017208:Rats, Wistar; D011985:Receptors, Serotonin / Q000187:drug effects / Q000378:metabolism*; D044263:Receptors, Serotonin, 5-HT1; D017366:Serotonin Receptor Agonists / Q000494:pharmacology; D015398:Signal Transduction / Q000187:drug effects / Q000502:physiology; D014660:Vasoactive Intestinal Peptide / Q000494:pharmacology
D011985:Receptors, Serotonin; D044263:Receptors, Serotonin, 5-HT1; D017366:Serotonin Receptor Agonists; D005576:Colforsin; D014660:Vasoactive Intestinal Peptide; D017371:8-Hydroxy-2-(di-n-propylamino)tetralin; D019001:Nitric Oxide Synthase; D000262:Adenylyl Cyclases