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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

cDNA cloning of a mouse prostacyclin receptor. Multiple signaling pathways and expression in thymic medulla.

A functional cDNA for a mouse prostacyclin receptor was isolated from a mouse cDNA library by reverse transcription polymerase chain reaction and hybridization screening. The cDNA encodes a polypeptide of 417 amino acid residues with putative seven transmembrane domains and an calculated molecular weight of 44,722. The amino acid sequence is 30-40% identical in the transmembrane domains to those of the mouse prostaglandin (PG) E receptor subtypes and thromboxane A2 receptor. [3H]Iloprost, a specific prostacyclin receptor radioligand, specifically bound to the membrane of Chinese hamster ovary cells permanently expressing the cDNA with Kd of 4.6 nM. This binding was displaced with unlabeled prostanoids in the order of cicaprost > iloprost, both prostacyclin agonists > PGE1 > carbacyclin >> PGD2 approximately STA2, a thromboxane A2 agonist approximately PGE2 > PGF2 alpha. Iloprost in a concentration-dependent fashion increased cAMP level and generated inositol phosphates in these cells, indicating that the receptor couples to multiple signal transduction pathways. Northern blot analysis revealed that the mRNA is expressed most abundantly in thymus, followed by spleen, heart, and lung. In situ hybridization of thymus showed that it is expressed exclusively in medulla and not in cortex.[1]


  1. cDNA cloning of a mouse prostacyclin receptor. Multiple signaling pathways and expression in thymic medulla. Namba, T., Oida, H., Sugimoto, Y., Kakizuka, A., Negishi, M., Ichikawa, A., Narumiya, S. J. Biol. Chem. (1994) [Pubmed]
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