Antigenic analysis of woodchuck hepatitis virus surface antigen with site-specific radioimmunoassays
- PMID: 6199511
- PMCID: PMC255527
- DOI: 10.1128/JVI.49.3.701-708.1984
Antigenic analysis of woodchuck hepatitis virus surface antigen with site-specific radioimmunoassays
Abstract
Monoclonal antibodies to five nonoverlapping antigenic domains of woodchuck hepatitis virus surface antigen (WHsAg) were used to develop site-specific radioimmunoassays. The assays were based on the solid-phase sandwich principle in which different combinations of individual domain-specific antibodies were used as immunoadsorbents and radioiodinated probes. Over 85% of the combinations tested were able to detect serum WHsAg, including those using the same antibody as immunoadsorbent and probe. The limits for antigen detection in one site-specific system ranged between 16 and 80 ng of WHsAg per ml. The antigenic similarity of serum WHsAg from 13 colony woodchucks was shown with several combination assay systems. WHsAg was equally immunoreactive in these assay systems whether obtained by immunoaffinity chromatography or standard rate zone centrifugation methods. Further site-specific analysis demonstrated that Formalin treatment of purified antigen did not affect the immunoreactivity of these WHsAg sites.
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