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Cloning and expression of cDNA for a human thromboxane A2 receptor

Nature volume 349, pages 617–620 (1991)Cite this article

Abstract

THROMBOXANE A2 is a very unstable arachidonate metabolite, yet a potent stimulator of platelet aggregation and a constrictor of vascular and respiratory smooth muscles1. It has been implicated as a mediator in diseases such as myocardial infarction, stroke and bronchial asthma2. Using a stable analogue of this compound we recently purified the human platelet thromboxane A2 receptor to apparent homogeneity3. Using an oligonucleotide probe corresponding to its partial amino-acid sequence, we have obtained a complementary DNA clone encoding this receptor from human placenta and a partial clone from cultured human megakaryocytic leukaemia cells. The placenta cDNA encodes a protein of 343 amino acids with seven putative transmembrane domains. The protein expressed in COS-7 cells binds drugs with affinities identical to those of the platelet receptor, and that in Xenopus oocytes opens Ca2+-activated Cl- channel on agonist stimulation. Northern blot analysis and nucleotide sequences of the two clones suggest that an identical species of the thromboxane A2 receptor is present in platelets and vascular tissues. This first report on the molecular structure of an eicosanoid receptor will promote the molecular pharmacology and pathophysiology of these bioactive compounds.

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Authors and Affiliations

  1. Department of Pharmacology and Institute for Immunology, Kyoto University Faculty of Medicine, Kyoto, 606, Japan

    Masakazu Hirata, Yasunori Hayashi, Fumitaka Ushikubi, Yoshifumi Yokota, Ryoichiro Kageyama, Shigetada Nakanishi & Shuh Narumiya

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  1. Masakazu Hirata
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  2. Yasunori Hayashi
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  3. Fumitaka Ushikubi
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  4. Yoshifumi Yokota
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  5. Ryoichiro Kageyama
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  6. Shigetada Nakanishi
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  7. Shuh Narumiya
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Hirata, M., Hayashi, Y., Ushikubi, F. et al. Cloning and expression of cDNA for a human thromboxane A2 receptor. Nature 349, 617–620 (1991). https://doi.org/10.1038/349617a0

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