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Molecular Endocrinology Vol. 6, No. 3 384-393
doi:10.1210/me.6.3.384
Copyright © 1992 by the Endocrine Society.
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Molecular Endocrinology, Vol 6, 384-393, Copyright © 1992 by Endocrine Society

ARTICLES

Molecular cloning and expression of the cDNA for a novel A2-adenosine receptor subtype

JH Stehle, SA Rivkees, JJ Lee, DR Weaver, JD Deeds and SM Reppert
Laboratory of Developmental Chronobiology, Massachusetts General Hospital, Boston 02114.

A novel adenosine receptor subtype has been cloned from a rat brain cDNA library using a probe generated by the polymerase chain reaction. The cDNA, designated RFL9, encodes a protein of 332 amino acids. The structure of RFL9 is most similar to that of the recently cloned rat A2- adenosine receptor, with a sequence identity of 73% within the presumed seven transmembrane domains. Expression of RFL9 in COS-6M cells resulted in ligand binding and functional activity characteristics of an adenosine receptor that is coupled positively to adenylyl cyclase. Examination of the tissue distribution of RFL9 mRNA by Northern blot analysis showed a restricted distribution with highest levels expressed in large intestine, cecum, and urinary bladder; this pattern was distinct from that of either the A1- or A2-adenosine receptor mRNAs. In situ hybridization studies of RFL9 mRNA showed no specific hybridization pattern in brain, but a hybridization signal was readily observed in the hypophyseal pars tuberalis. Thus, RFL9 encodes a novel A2-adenosine receptor subtype.




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Endocrinology Endocrine Reviews J. Clin. End. & Metab.
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Copyright © 1992 by The Endocrine Society