The novel VIP-like hypothalamic polypeptide PACAP interacts with high affinity receptors in the human neuroblastoma cell line NB-OK

Journal Article · Sun Jul 01 00:00:00 EDT 1990 · Peptides (Fayetteville, New York); (USA)

DOI:https://doi.org/10.1016/0196-9781(90)90194-A· OSTI ID:6324766

Cauvin, A; Buscail, L; Gourlet, P; De Neef, P; Gossen, D; Arimura, A; Miyata, A; Coy, D H; Robberecht, P; Christophe, J ^[1]

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1. Universite Libre de Bruxelles (Belgium)

We investigated the ability of two forms of Pituitary Adenylate Cyclase Activating Polypeptide (PACAP-38, the 38 amino acid peptide isolated from ovine hypothalamus, and PACAP-27, a shorter N-terminal (1-27) amidated version) to interact with specific receptors in membranes from the human neuroblastoma cell line NB-OK. ({sup 125}I)PACAP-27 bound rapidly and specifically to one class of high affinity sites (Kd 0.5 nM). VIP inhibited ({sup 125}I)PACAP-27 binding 300- to 1000-fold less potently than PACAP-27 and PACAP-38. One microM PHI prevented tracer binding only partially and secretin, glucagon and GRF(1-29)NH2 were ineffective in this respect. PACAP-27 and PACAP-38 stimulated adenylate cyclase activity dose dependently and with similar efficacy (Kact 0.2-0.3 nM), this activation being compatible with the occupancy of specific high affinity PACAP receptor. VIP was markedly less potent and less efficient on this enzyme than PACAP. Chemical cross-linking of ({sup 125}I)PACAP-27 followed by SDS-PAGE and autoradiography revealed specific cross-linking with a 68 kDa protein.

• OSTI ID: 6324766
• Journal Information: Peptides (Fayetteville, New York); (USA), Vol. 11:4; ISSN 0196-9781
• Country of Publication: United States
• Language: English

Related Subjects

59 BASIC BIOLOGICAL SCIENCES
POLYPEPTIDES
RECEPTORS
BIOCHEMICAL REACTION KINETICS
AFFINITY
AMINO ACID SEQUENCE
AUTORADIOGRAPHY
CYCLASES
ELECTROPHORESIS
ENZYME ACTIVITY
HYPOTHALAMUS
IODINE 125
MAN
TUMOR CELLS
ANIMAL CELLS
ANIMALS
BETA DECAY RADIOISOTOPES
BODY
BRAIN
CENTRAL NERVOUS SYSTEM
DAYS LIVING RADIOISOTOPES
ELECTRON CAPTURE RADIOISOTOPES
ENZYMES
INTERMEDIATE MASS NUCLEI
IODINE ISOTOPES
ISOTOPES
KINETICS
LYASES
MAMMALS
MEMBRANE PROTEINS
MOLECULAR STRUCTURE
NERVOUS SYSTEM
NUCLEI
ODD-EVEN NUCLEI
ORGANIC COMPOUNDS
ORGANS
PEPTIDES
PRIMATES
PROTEINS
RADIOISOTOPES
REACTION KINETICS
VERTEBRATES
550201* - Biochemistry- Tracer Techniques