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| Item Type: | Article |
|---|---|
| Title: | beta(2)-glycoprotein-1 (apolipoprotein H) and beta(2)-glycoprotein-1-phospholipid complex harbor a recognition site for the endocytic receptor megalin |
| Creators Name: | Moestrup, S.K., Schousboe, I., Jacobsen, C., Leheste, J.R., Christensen, E.I. and Willnow, T.E. |
| Abstract: | Screening of serum by using a surface plasmon resonance analysis assay identified beta2-glycoprotein-I/apolipoprotein H as a plasma component binding to the renal epithelial endocytic receptor megalin. A calcium-dependent megalin-mediated beta2-glycoprotein-I endocytosis was subsequently demonstrated by ligand blotting of rabbit renal cortex and uptake analysis in megalin-expressing cells. Immunohistochemical and immunoelectron microscopic examination of kidneys and the presence of high concentrations of beta2-glycoprotein-I in urine of mice with disrupted megalin gene established that megalin is the renal clearance receptor for beta2-glycoprotein-I. A significant increase in functional affinity for purified megalin was observed when beta2-glycoprotein-I was bound to the acidic phospholipids, phosphatidylserine and cardiolipin. The binding of beta2-glycoprotein-I and beta2-glycoprotein-I- phospholipid complexes to megalin was completely blocked by receptor-associated protein. In conclusion, we have demonstrated a novel receptor recognition feature of beta2-glycoprotein-I. In addition to explaining the high urinary excretion of beta2-glycoprotein-I in patients with renal tubule failure, the data provide molecular evidence for the suggested function of beta2-glycoprotein-I as a linking molecule mediating cellular recognition of phosphatidylserine-exposing particles. |
| Keywords: | beta 2-Glycoprotein I, Biosensing Techniques, Blood Proteins, Calcium, Cardiolipins, Cultured Tumor Cells, Endocytosis, Glycoproteins, Heymann Nephritis Antigenic Complex, Immunoelectron Microscopy, Immunohistochemistry, Immunologic Receptors, Kidney Cortex, Low Density Lipoprotein Receptor-Related Protein-1, Membrane Glycoproteins, Phosphatidylserines, Phospholipids, Protein Binding, Animals, Mice, Rabbits, Rats |
| Source: | Journal of Clinical Investigation |
| ISSN: | 0021-9738 |
| Publisher: | American Society for Clinical Investigation |
| Volume: | 102 |
| Number: | 5 |
| Page Range: | 902-909 |
| Date: | 1 September 1998 |
| Official Publication: | https://doi.org/10.1172/JCI3772 |
| PubMed: | View item in PubMed |
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