PS-liposome and Ox-LDL bind to different sites of the immunodominant domain (#155-183) of CD36: A study with GS95, a new anti-CD36 monoclonal antibody

CD36, a multifunctional adhesive receptor on a variety of cells such as mon ocytes and platelets, has been implicated in clearance of modified LDL and in the removal of apoptotic or senescent cells. We recently developed a new anti-CD36 monoclonal antibody, GS95, We determined the binding site of pho sphatidylserine (PS)-liposome on CD36 by flow cytometric analysis of compet itive bindings between phospholipid-liposomes or synthetic CD36 peptides an d FITC-labeled anti-CD36 antibodies (GS95, OKM5, and FA6-152), The epitope of GS95 was mapped to the amino acid sequence #162-183 of CD36 that was par tially overlapped with, but distinct from, #155-183, which has been reporte d as the epitopes of two commercially available antibodies, OKM5 and FA6-15 2, Oxidized-LDL dose-dependently inhibited bindings of both GS95 and OKM5 a ntibodies to platelet CD36, while PS-liposome inhibited the binding of GS95 but not OKM5 or FA6-152, These results indicate that the binding site of P S-liposome on platelet CD36 is not identical to that of oxidized-LDL and ma y be located in the amino acid sequence #162-183. (C) 2000 Elsevier Science Ltd. All rights reserved.