Abstract
Hantaan virus (HV) 76-118, isolated from Apodemus agrarius coreae in Korea, and hemorrhagic fever with renal syndrome (HFRS) virus B-1, isolated from a rat in Japan, were examined for polypeptide compositions and for differences in immune responses in rats. In immunoprecipitation experiments, a major polypeptide of ca. 50 kilodaltons (K) was detected with antisera against HV 76-118 in cell extracts from Vero E6 cells infected with HFRS virus B-1, whereas three major polypeptides of 74 K (glycosylated), 57 K (glycosylated), and 50 K were detected with antisera against HFRS virus B-1. On the other hand, two polypeptides with molecular weights of 55,000 (glycosylated) and 50,000 were detected with either antiserum in cell extracts infected with HV 76-118. In neutralizing antibody tests with antisera prepared in rats, a remarkable difference in antibody titer (5 to 30 times higher to the homologous virus than to the heterologous virus) was observed between the two viruses. However, this difference was not so marked (1 to 4 times higher to the homologous virus) in the immunofluorescent antibody test. Twenty hybrid cell lines producing mouse monoclonal antibodies against HV 76-118 were isolated by fusion of spleen cells from BALB/c mice immunized against HV (strain 76-118) with mouse myeloma cells. The specificity of these monoclonal antibodies was established by immunofluorescent antibody, neutralizing antibody, and fluorescent antibody to membrane antigen tests and by analysis with sodium dodecyl sulfate-polyacrylamide gel electrophoresis. These hybrid cell lines were classified into three groups based principally on the IF staining pattern of the HV-infected cells: (i) antibodies which showed a discrete patch pattern in the cytoplasm by the immunofluorescent antibody test, reacting with the membrane antigen of infected cells and immunoprecipitating a 55-K glycoprotein from HV 76-118-infected cell lysates and a 57-K glycoprotein from the heterologous (strain B-1) HFRS virus-infected cell lysates. Among these, depending on the neutralizing antibody activity and the reaction with the heterologous antigen, three subgroups designated I-A, I-B, and I-C were established; (ii) antibodies which showed large granular dots in the cytoplasm, neither having neutralizing antibody activity nor immunoprecipitating any antigen; (iii) antibodies which showed defined granular dots throughout the cytoplasm, reacting with a 50-K polypeptide of both virus strains. These antibodies also classified into two subgroups based on the reactivity with the B-1 strain.(ABSTRACT TRUNCATED AT 400 WORDS)
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