Abstract
A cDNA clone for the mouse thromboxane A2 receptor was isolated from mouse lung cDNA library. The cDNA has a 1,023 base pair open reading frame which encodes a protein of 341 amino acid residues. STA2 and U-46619 induced inward current in Xenopus laevis oocytes injected with the transcript of the clone. Specific binding of [3H]S-145 was found in membranes of COS-1 cells transfected with the cDNA (Kd = 3.3 nM) and was displaced with unlabeled prostaglandins and thromboxane analogues in the order of S-145 greater than STA2 greater than U-46619 greater than PGD2 greater than PGF2 alpha = PGE2. Northern blot analysis demonstrated that thromboxane A2 receptor mRNA is expressed abundantly in thymus, spleen and lung.
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