PMID- 10691928 OWN - NLM STAT- MEDLINE DCOM- 20000424 LR - 20190513 IS - 0009-9104 (Print) IS - 1365-2249 (Electronic) IS - 0009-9104 (Linking) VI - 119 IP - 3 DP - 2000 Mar TI - Human monoclonal anti-phospholipid antibodies selectively bind to membrane phospholipid and beta2-glycoprotein I (beta2-GPI) on apoptotic cells. PG - 533-43 AB - The ability of an anti-phospholipid (LJ1) and an anti-beta2-GPI (RSP-57) human MoAb to bind to apoptotic but not viable cells was demonstrated in this study. Both MoAbs were derived from patients with systemic lupus erythematosus and anti-phospholipid antibody syndrome. The parallel analysis of the specificity and affinity of four anti-phospholipid human MoAbs suggests that the binding of LJ1 MoAb to apoptotic cells is a specific property of this MoAb. RSP-57 MoAb recognizes apoptotic cells through beta2-GPI which becomes available for binding after the interaction with negatively charged phospholipids. This observation provides evidence that the binding of human anti-phospholipid antibodies to apoptotic cells occurs in both a beta2-GPI-dependent and independent way and involves a restricted group of epitopes. The finding that LJ1 and RSP-57 MoAbs bind apoptotic cells underlines the property of these MoAbs to act as cell membrane markers of apoptosis. Major pathological implications derive from the observation that LJ1 and RSP-57 MoAbs recognize epitopes expressed on 'early' apoptotic cells. The interference with the in vivo clearance and processing of apoptotic cells is a potential pathogenic mechanism of these antibodies. FAU - Pittoni, V AU - Pittoni V AD - Centre for Rheumatology/Bloomsbury Rheumatology Unit, Department of Medicine and Department of Haematology, University College London, London, UK. FAU - Ravirajan, C T AU - Ravirajan CT FAU - Donohoe, S AU - Donohoe S FAU - MacHin, S J AU - MacHin SJ FAU - Lydyard, P M AU - Lydyard PM FAU - Isenberg, D A AU - Isenberg DA LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't PL - England TA - Clin Exp Immunol JT - Clinical and experimental immunology JID - 0057202 RN - 0 (Antibodies, Antiphospholipid) RN - 0 (Antibodies, Monoclonal) RN - 0 (Glycoproteins) RN - 0 (Membrane Lipids) RN - 0 (Phospholipids) RN - 0 (beta 2-Glycoprotein I) SB - IM MH - Animals MH - Antibodies, Antiphospholipid/*immunology MH - Antibodies, Monoclonal/*immunology MH - Antibody Specificity MH - Apoptosis/*immunology MH - Flow Cytometry MH - Glycoproteins/*immunology MH - Humans MH - Membrane Lipids/immunology MH - Mice MH - Phospholipids/*immunology MH - U937 Cells MH - beta 2-Glycoprotein I PMC - PMC1905581 EDAT- 2000/02/26 09:00 MHDA- 2000/04/29 09:00 PMCR- 2001/03/01 CRDT- 2000/02/26 09:00 PHST- 2000/02/26 09:00 [pubmed] PHST- 2000/04/29 09:00 [medline] PHST- 2000/02/26 09:00 [entrez] PHST- 2001/03/01 00:00 [pmc-release] AID - cei1161 [pii] AID - 10.1046/j.1365-2249.2000.01161.x [doi] PST - ppublish SO - Clin Exp Immunol. 2000 Mar;119(3):533-43. doi: 10.1046/j.1365-2249.2000.01161.x.