title: Scavenger receptors of endothelial cells mediate the uptake and cellular proatherogenic effects of carbamylated LDL.
abstract: OBJECTIVE
  Carbamylated LDL (cLDL) has been recently shown to have robust proatherogenic effects on human endothelial cells in vitro, suggesting cLDL may have a significant role in atherosclerosis in uremia. The current study was designed to determine which receptors are used by cLDL and thus cause the proatherogenic effects.
  
  
  RESULTS
  In ex vivo or in vitro models as well as in intact animals, administration of cLDL was associated with endothelial internalization of cLDL and subendothelial translocation (transcytosis). In vitro recombinant LOX-1 and SREC-1 receptors showed the greatest cLDL binding. However, pretreatment of the endothelial cells with specific inhibiting antibodies demonstrated that cLDL binds mainly to LOX-1 and CD36 receptors. The transcytosis was dependent on SR-A1, SREC-1, and CD36 receptors whereas LOX-1 receptor was not involved. The cytotoxicity was mediated by several studied scavenger receptors, but cLDL-induced monocyte adhesion depended only on LOX-1. The cLDL-induced synthesis of LOX-1 protein significantly contributed to both cytotoxicity and accelerated monocyte adhesion to endothelial cells.
  
  
  CONCLUSIONS
  Our data suggest that cLDL uses a unique pattern of scavenger receptors. They show that LOX-1 receptor, and partially CD36, SREC-1, and SR-A1 receptors, are essential for the proatherogenic effects of cLDL on human endothelial cells.
authors.affiliation: Department of Pharmacology & Toxicology, University of Arkansas for Medical Sciences, 4301 W Markham St, Little Rock, AR 72205, USA.
authors.forename: Eugene O
authors.initials: EO
authors.lastname: Apostolov
authors.forename: Sudhir V
authors.initials: SV
authors.lastname: Shah
authors.forename: Debarti
authors.initials: D
authors.lastname: Ray
authors.forename: Alexei G
authors.initials: AG
authors.lastname: Basnakian
mesh_terms: D000818:Animals; D050197:Atherosclerosis / Q000209:etiology*; D018955:CD36 Antigens / Q000502:physiology; D002448:Cell Adhesion; D002478:Cells, Cultured; D042783:Endothelial Cells / Q000502:physiology*; D006801:Humans; D008077:Lipoproteins, LDL / Q000378:metabolism / Q000633:toxicity*; D051379:Mice; D008810:Mice, Inbred C57BL; D009000:Monocytes / Q000502:physiology; D051116:Receptors, Scavenger / Q000502:physiology*; D051127:Scavenger Receptors, Class E / Q000502:physiology; D051128:Scavenger Receptors, Class F / Q000502:physiology
chemical_list: D018955:CD36 Antigens; D008077:Lipoproteins, LDL; C495137:OLR1 protein, human; C495138:Olr1 protein, mouse; D051116:Receptors, Scavenger; C495126:SCARF1 protein, human; D051127:Scavenger Receptors, Class E; D051128:Scavenger Receptors, Class F; C039916:carbamyl-LDL
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