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Am J Physiol Gastrointest Liver Physiol 281: G507-G514, 2001;
0193-1857/01 $5.00
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Vol. 281, Issue 2, G507-G514, August 2001

Molecular characterization and organ distribution of type A and B cholecystokinin receptors in cynomolgus monkey

Eileen L. Holicky, Elizabeth M. Hadac, Xi-Qin Ding, and Laurence J. Miller

Departments of Internal Medicine and Biochemistry/Molecular Biology, Center for Basic Research in Digestive Diseases, Mayo Clinic and Foundation, Rochester, Minnesota 55905

Differences in the molecular structure or organ distribution of receptors can limit the usefulness of a given species for drug studies. In this work, we have studied cholecystokinin (CCK) receptors in cynomolgus monkey, an animal model useful for preclinical testing. The type A CCK receptor cDNA was cloned and predicted to encode a 428 amino acid peptide that was 98% identical to the human receptor. Only 2 of the 10 residues that were distinct from the human receptor were not present in other cloned CCK receptor species. A Chinese hamster ovary cell line that stably expressed this receptor was developed. The cynomolgus receptor expressed in this environment was functionally indistinguishable from the human receptor, binding CCK with high affinity [inhibition constant (KI) = 1.8 ± 0.5 nM] and exhibiting a potent intracellular calcium signaling response to this hormone (EC50 = 6.6 ± 2.1 pM). Like the human type A CCK receptor, this receptor was expressed prominently in monkey gallbladder and stomach and was expressed in low levels in brain and pancreas. The type B CCK receptor cDNA was cloned from stomach and brain (450 residue receptor that is 96% identical to the human receptor), where it was highly expressed yet was undetectable in gallbladder or pancreas. This work confirms the relevance of the cynomolgus species for preclinical testing of drugs acting on the type A CCK receptor.

G protein-coupled receptor; ligand binding; cDNA cloning; cynomolgus monkey


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