Dynorphin binds to neuropeptide Y and peptide YY receptors in human neuroblastoma cell lines.
Am J Physiol
; 267(5 Pt 1): E702-9, 1994 Nov.
Article
en En
| MEDLINE
| ID: mdl-7977721
ABSTRACT
The modulation of neuropeptide Y (NPY) and peptide YY (PYY) receptors by dynorphin, luteinizing hormone-releasing hormone (LHRH), corticotropin-releasing factor (CRF), and cholecystokinin octapeptide has been studied in human neuroblastoma cell lines SK-N-MC and SMS-MSN, which express Y1 and Y2 receptors for NPY/PYY. Dynorphin A and LHRH inhibited the binding of NPY/PYY to SK-N-MC cell membranes at concentrations ranging from 10(-7) to 10(-5) M, whereas dynorphin A and CRF were effective in SMS-MSN cells. The inhibitory effect of dynorphin A on NPY/PYY binding was observed in the presence of guanosine 5'-O-(3-thiotriphosphate), a nonhydrolyzable GTP analogue, as well as H-7 and H-8, novel inhibitors of protein kinases C and A. However, U-50488, the most potent kappa-selective compound did not mimic the dynorphin action. Dynorphin A showed neither effect on the dissociation of NPY/PYY from their receptors nor inhibition on the basal as well as forskolin-stimulated adenosine 3',5'-cyclic monophosphate response. These results indicate that the interaction of dynorphin A with Y1 and Y2 receptors is not mediated by changes in receptor-G protein interaction, receptor phosphorylation, and allosteric binding to NPY/PYY receptors but that dynorphin A binds to NPY/PYY receptors at high concentrations, probably in an antagonistic manner.
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Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Receptores de la Hormona Gastrointestinal
/
Dinorfinas
/
Receptores de Neuropéptido Y
/
Neuroblastoma
Límite:
Humans
Idioma:
En
Revista:
Am J Physiol
Año:
1994
Tipo del documento:
Article
País de afiliación:
Japón