Cloning, sequencing and functional expression of a guinea pig lung bradykinin B2 receptor

European Journal of Pharmacology
S G FarmerA Graham

Abstract

Kinin receptors are classified as B1 and B2 based upon agonist and antagonist potencies and cloning and expression studies. Using sequences from human and rat bradykinin B2 receptors, polymerase chain reaction (PCR) was utilized to isolate cDNA from guinea pig lung. The receptor obtained is predicted to have 372 amino acids and shares > 80% sequence homology with human, rat, rabbit and mouse B2 receptors. In competition binding experiments in Chinese hamster ovary (CHO-K1) cells in which the guinea pig cDNA was expressed, [3H]bradykinin was displaced by kinin receptor ligands with an order of potency consistent with a B2 subtype. In CHO cells expressing the guinea pig receptor, bradykinin caused a concentration 45Ca2+ efflux. A B1 receptor agonist, desArg9-bradykinin, also caused 45Ca2+ efflux but with a potency several orders of magnitude lower than bradykinin. Curiously, several B1 and B2 receptor antagonists induced 45Ca2+ efflux, indicating that this receptor may be coupled differently in CHO cells than in native tissues.

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Citations

May 18, 2004·Neurochemistry International·Mami NodaKeiji Wada
Dec 20, 2002·International Immunopharmacology·J Fred HessRay S L Chang
Dec 20, 2002·International Immunopharmacology·Cécile CaylaMichael Bader
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Feb 8, 2003·American Journal of Physiology. Heart and Circulatory Physiology·Christian SchroederWerner Müller-Esterl

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