Abstract
Xenopus PSP24 (xPSP24) is a G-protein-coupled receptor which was originally identified as a functional lysophosphatidic acid (LPA) receptor. We obtained two different types (alpha and beta) of mammalian homologues of xPSP24 and found that these receptors are highly expressed in the brain (Kawasawa et al., Biochem. Biophys. Res. Commun. 276, 952-956, 2000). These receptor did not respond to LPA by GTPgammaS binding assays, while Edg2 or Edg4 showed responses to LPA under the same assay conditions. Furthermore, a sensitive reporter gene assay using PC12 cells with serum response element promoter failed to detect any response of mammalian PSP24s to various concentrations of LPA. Thus, unlike xPSP24, we conclude that PSP24s are not functional LPA receptors in mammalian systems.
Copyright 2000 Academic Press.
Publication types
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Research Support, Non-U.S. Gov't
MeSH terms
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Animals
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Cell Membrane / chemistry
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Cell Membrane / metabolism
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Evolution, Molecular
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Fluorescent Antibody Technique
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Genes, Reporter / genetics
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Guanosine 5'-O-(3-Thiotriphosphate) / metabolism
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Guanosine 5'-O-(3-Thiotriphosphate) / pharmacology
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Heterotrimeric GTP-Binding Proteins / metabolism
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Humans
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Lysophospholipids / pharmacology*
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Mice
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PC12 Cells
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Phylogeny
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Promoter Regions, Genetic / genetics
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Protein Binding
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Protein Isoforms / genetics
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Protein Isoforms / metabolism
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Rats
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Receptors, Cell Surface / genetics
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Receptors, Cell Surface / metabolism*
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Receptors, G-Protein-Coupled*
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Receptors, Lysophosphatidic Acid
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Response Elements / genetics
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Xenopus Proteins*
Substances
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Lysophospholipids
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PSP24 receptor, Xenopus
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Protein Isoforms
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Receptors, Cell Surface
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Receptors, G-Protein-Coupled
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Receptors, Lysophosphatidic Acid
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Xenopus Proteins
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Guanosine 5'-O-(3-Thiotriphosphate)
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Heterotrimeric GTP-Binding Proteins