A radioimmunoassay for detection of circulating antibodies reacting with the hepatic asialoglycoprotein receptor protein.
To determine whether circulating antibodies against the liver-specific membrane lipoprotein complex (LSP), which occur in a number of liver disorders, are directed at the hepatic asialoglycoprotein receptor protein (hepatic lectin)--recently shown to be a constituent of LSP--a radioimmunoassay for anti-hepatic lectin antibodies was developed based on the use of protein A in situ on staphylococcal cells to precipitate 125I-labelled rabbit hepatic lectin/anti-lectin immune complexes. The assay was used to test sera from 30 patients (15 anti-LSP-positive and 15 anti-LSP-negative) with autoimmune chronic active hepatitis (CAH), hepatitis B virus-positive CAH or primary biliary cirrhosis. Anti-lectin antibodies (at titres of 1:200 to 1:1600) were found in all 15 anti-LSP-positive sera and were not detected in the 15 anti-LSP-negative patients. Hepatic lectin is a highly purifiable, liver-specific, hepatocellular surface component and the anti-lectin assay (which proved sensitive, reliable and easy to perform) will permit further exploration of the role of autoimmune mechanisms in the pathogenesis of various liver diseases.
D037263:Asialoglycoprotein Receptor; D001212:Asialoglycoproteins / Q000378:metabolism; D001323:Autoantibodies / Q000032:analysis*; D006521:Hepatitis, Chronic / Q000276:immunology*; D006801:Humans; D008074:Lipoproteins / Q000276:immunology; D008099:Liver / Q000276:immunology*; D008105:Liver Cirrhosis, Biliary / Q000276:immunology; D008565:Membrane Proteins; D011506:Proteins / Q000276:immunology; D011863:Radioimmunoassay; D011971:Receptors, Immunologic / Q000276:immunology
D037263:Asialoglycoprotein Receptor; D001212:Asialoglycoproteins; D001323:Autoantibodies; D008074:Lipoproteins; D008565:Membrane Proteins; D011506:Proteins; D011971:Receptors, Immunologic