Endocrinology, Vol 137, 72-77, Copyright © 1996 by Endocrine Society

ARTICLES

Cloning and characterization of the human corticotropin-releasing factor-2 receptor complementary deoxyribonucleic acid

CW Liaw, TW Lovenberg, G Barry, T Oltersdorf, DE Grigoriadis and EB de Souza
Department of Molecular Neurobiology, Neurocrine Biosciences, Inc., San Diego, California 92121, USA.

Two CRF receptor subtypes (CRF1 and CRF2 receptors) with distinct brain localizations and pharmacological profiles have recently been cloned and characterized. For the CRF2 receptor subtype, at least 2 splice forms with different 5'-coding sequences (CRF2 alpha and CRF2 beta) have been identified in rat. In this article, we report the genomic structure and the corresponding complementary DNA (cDNA) sequence of the human CRF2 receptor. The gene coding for human CRF2 receptor consists of at least 12 exons and spans approximately 30 kilobases. The cDNA sequence in the protein-coding region is 94% identical to that of the reported rat CRF2 alpha receptor. At present, there is no evidence for the existence of a CRF2 beta receptor homolog in humans. The encoded receptor is 411 amino acids in length and is 70% identical to the human CRF1 receptor, with least sequence homology in the N-terminal extracellular domain (47% identical). Cells transfected with the full- length human CRF2 receptor cDNA responded to rat/human CRF and sauvagine by increasing the intracellular cAMP level, with EC50 values of approximately 20 and 1 nM, respectively. The CRF- and sauvagine- induced accumulation of intracellular cAMP could be competitively inhibited by the CRF receptor antagonist D-Phe-CRF. This pharmacological profile was comparable to that of the rat CRF2 alpha receptor. The relative abundance of the CRF2 receptor messenger RNA appears to be lower in humans than in rats for the tissues studied thus far.

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