Neuropeptide Y inhibits vasoactive intestinal peptide-stimulated adenylyl cyclase in rat ventral prostate.
Neuropeptide Y (NPY), a peptide present in the prostate gland, was found to inhibit vasoactive intestinal peptide (VIP)-stimulated cyclic AMP accumulation in isolated rat prostatic epithelial cells as well as VIP-stimulated adenylyl cyclase activity in rat prostatic membranes. The inhibitory effect of NPY was selective for the VIP receptor/effector system since it was also observed when using pituitary adenylyl cyclase activating peptide (PACAP-27) which presumably recognizes VIP receptors in this gland, but not when using unrelated substances such as isoproterenol or forskolin. NPY did not modify either the general lipid membrane microviscosity or the VIP-receptor binding. The inhibitory effect of VIP was blocked by pretreatment of the prostatic membranes with pertussis toxin. These results suggest the presence of NPY receptors in rat ventral prostate coupled in an inhibitory manner to adenylyl cyclase through a guanine nucleotide regulatory Gi protein.
Departamento de Bioquimica y Biologia Molecular, Universidad de Alcala, Alcala de Henares, Spain.
R M
RM
Solano
M J
MJ
Carmena
L G
LG
Guijarro
J C
JC
Prieto
D000067956:Adenylyl Cyclase Inhibitors; D000818:Animals; D005576:Colforsin / Q000494:pharmacology; D016231:Fluorescence Polarization Immunoassay; D019204:GTP-Binding Proteins / Q000378:metabolism; D066298:In Vitro Techniques; D007457:Iodine Radioisotopes; D007545:Isoproterenol / Q000494:pharmacology; D008297:Male; D008563:Membrane Lipids / Q000378:metabolism; D009478:Neuropeptide Y / Q000494:pharmacology*; D009479:Neuropeptides / Q000378:metabolism; D018377:Neurotransmitter Agents / Q000378:metabolism; D051219:Pituitary Adenylate Cyclase-Activating Polypeptide; D011467:Prostate / Q000187:drug effects / Q000201:enzymology*; D051381:Rats; D017208:Rats, Wistar; D013552:Swine; D014660:Vasoactive Intestinal Peptide / Q000037:antagonists & inhibitors* / Q000378:metabolism / Q000494:pharmacology
C495403:Adcyap1 protein, rat; D000067956:Adenylyl Cyclase Inhibitors; D007457:Iodine Radioisotopes; D008563:Membrane Lipids; D009478:Neuropeptide Y; D009479:Neuropeptides; D018377:Neurotransmitter Agents; D051219:Pituitary Adenylate Cyclase-Activating Polypeptide; D005576:Colforsin; D014660:Vasoactive Intestinal Peptide; D019204:GTP-Binding Proteins; D007545:Isoproterenol