title: Molecular cloning of a novel scavenger receptor for oxidized low density lipoprotein, SR-PSOX, on macrophages.
abstract: Receptor-mediated endocytosis of oxidized low density lipoprotein (OxLDL) by macrophages has been implicated in foam cell transformation in the process of atherogenesis. Although several scavenger receptor molecules, including class A scavenger receptors and CD36, have been identified as OxLDL receptors on macrophages, additional molecules on macrophages may also be involved in the recognition of OxLDL. From a cDNA library of phorbol 12-myristate 13-acetate-stimulated THP-1 cells, we isolated a cDNA encoding a novel protein designated SR-PSOX (scavenger receptor that binds phosphatidylserine and oxidized lipoprotein), which acts as a receptor for OxLDL. SR-PSOX was a type I membrane protein consisting of 254 amino acids, expression of which was shown on human and murine macrophages with a molecular mass of 30 kDa. SR-PSOX could specifically bind with high affinity, internalize, and degrade OxLDL. The recognition of OxLDL was blocked by polyinosinic acid and dextran sulfate but not by acetylated low density lipoprotein. Taken together, SR-PSOX is a novel class of molecule belonging to the scavenger receptor family, which may play important roles in pathophysiology including atherogenesis.
authors.affiliation: Institute for Virus Research and Graduate School of Medicine, Kyoto University, Sakyo-ku, Kyoto 606-8507, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Shimaoka
authors.forename: N
authors.initials: N
authors.lastname: Kume
authors.forename: M
authors.initials: M
authors.lastname: Minami
authors.forename: K
authors.initials: K
authors.lastname: Hayashida
authors.forename: H
authors.initials: H
authors.lastname: Kataoka
authors.forename: T
authors.initials: T
authors.lastname: Kita
authors.forename: S
authors.initials: S
authors.lastname: Yonehara
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D015152:Blotting, Northern; D018955:CD36 Antigens; D019556:COS Cells; D002460:Cell Line; D003001:Cloning, Molecular; D004705:Endocytosis; D006801:Humans; D008077:Lipoproteins, LDL / Q000378:metabolism*; D008264:Macrophages / Q000737:chemistry*; D008565:Membrane Proteins; D008969:Molecular Sequence Data; D008970:Molecular Weight; D011971:Receptors, Immunologic / Q000235:genetics*; D011973:Receptors, LDL / Q000235:genetics*; D018110:Receptors, Lipoprotein; D051116:Receptors, Scavenger; D051117:Scavenger Receptors, Class A; D051122:Scavenger Receptors, Class B; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology
chemical_list: D018955:CD36 Antigens; D008077:Lipoproteins, LDL; D008565:Membrane Proteins; D011971:Receptors, Immunologic; D011973:Receptors, LDL; D018110:Receptors, Lipoprotein; D051116:Receptors, Scavenger; C454739:Scarb1 protein, mouse; D051117:Scavenger Receptors, Class A; D051122:Scavenger Receptors, Class B; C099252:oxidized low density lipoprotein; D013755:Tetradecanoylphorbol Acetate