[Monoclonal antibodies to Marburg virus proteins and their immunochemical characteristics].

Hybridomas producing monoclonal antibodies (MAb) to Marburg virus proteins are prepared. Positive hybridomas were selected by solid-phase enzyme immunoassay (EIA) by specificity of their immunoglobulin reaction with Marburg virus antigen. Virus proteins reacting with MAbs were identified by immunoblotting. Out of 20 examined hybridoma antibodies, 5 reacted with protein VP35, 5 with VP40, 3 with NP, 1 with protein complex VP35-VP40, MAb 7H10 detected 2 proteins (VP40 and NP), and 5 MAbs did not bind virus proteins in this assay. Marburg virus antigen adsorbed on the surface of plates were detected by indirect EIA with biotin-treated MAbs (PEIA-MAb) and indirect EIA (IEIA-MAb). The sensitivity of both methods differed with different hybridoma antibodies and was the maximum with MAb 5F1 specific to Marburg virus nucleoprotein: 5-10 and 1-2 ng/ml for the direct and indirect methods, respectively. Purified MAbs 7C4, 7D8, and 5F1 were used as antigen captures in EIA for detecting immunoglobulins to Marburg virus in a serum from convalescent after Marburg fever. The results recommend the above MAbs for use in test systems for the diagnosis of the disease and detecting virus antigen.