Molecular cloning, developmental expression and pharmacological characterization of the CCKB/gastrin receptor in the calf pancreas.

Abstract:

:We have cloned the calf predominant pancreatic cholecystokinin B (CCKB)/gastrin receptor cDNA. It encodes a 454 amino acid protein with 90% identity with the CCKB/gastrin receptor cloned in other species and tissues. However, the calf pancreatic CCKB/gastrin receptor contains a pentapeptide cassette within the third intracellular loop which is absent in the cloned human brain and stomach receptor. Quantification of the CCKB/gastrin receptor mRNA levels by reverse transcription polymerase chain reaction demonstrated the same level of transcripts at birth, +7 and +28 days. On the other hand, binding study with pancreatic membranes showing a dramatic increase (600-fold) in the number of CCKB/gastrin receptor sites between at birth and +28 days indicates that the development of the calf pancreatic CCKB/gastrin receptor occurs during the first 4 weeks of post-natal life. COS monkey cells (COS-7 cells) transiently transfected by the cloned cDNA exhibit binding of 125I-Bolton-Hunter-[Thr28,Ahx31]CCK-(25-33) and 125I-Bolton-Hunter-[Leu15]human gastrin-(2-17) to two affinity classes of sites. Kd values of the high affinity binding components indicate a 4-fold higher affinity of the receptor for sulfated gastrin than for CCK. Finally, the recombinant receptor is coupled to G proteins and [Ca2+]i mobilization, and is expressed as a glycoprotein of 82 kDa.

journal_name

Eur J Pharmacol

authors

Dufresne M,Escrieut C,Clerc P,Le Huerou-Luron I,Prats H,Bertrand V,Le Meuth V,Guilloteau P,Vaysse N,Fourmy D

doi

10.1016/0014-2999(95)00737-7

subject

Has Abstract

pub_date

1996-02-15 00:00:00

pages

165-79

issue

1-2

eissn

0014-2999

issn

1879-0712

pii

0014-2999(95)00737-7

journal_volume

297

pub_type

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