title: Serological differences between human T-lymphotropic virus type-I (HTLV-I) and HTLV-III/LAV.
abstract: Sera from each of five preselected groups of patients with acquired immune deficiency syndrome (AIDS), AIDS-related complex (ARC), hemophilia, adult T-cell leukemia (ATL), and healthy controls were examined for antibodies to human T-cell leukemia (T-lymphotropic) virus type-I (HTLV-I) and HTLV-III by indirect immunofluorescence (IF) and radioimmunoprecipitation (RIP) methods. All sera from five patients with AIDS, ARC, and hemophilia reacted at titers from 1 : 512 to 1 : 5,120 with fixed H9/HTLV-III cells by IF but not with fixed MT-1 cells carrying HTLV-I. Similarly, sera from patients with AIDS, ARC, and hemophilia precipitated HTLV-III-specific polypeptides of 120K, 46K, and 24K. In contrast, sera from five patients with ATL did not react with fixed H9/HTLV-III cells, but reacted with fixed MT-1 cells. Moreover, HTLV-I-specific polypeptides of 68K, 28K, and 24K were precipitated with sera from ATL-patients but not with anti-HTLV-III-positive sera. Recently, we infected HTLV-I-carrying MT-4 cells with HTLV-III and provoked strong cytopathic effects. This system enabled testing for neutralizing antibodies to HTLV-III. Neutralizing titers to HTLV-III of five anti-HTLV-III-positive sera ranged from 1 : 720 to 1 : 9,000. In contrast, all five seronegative controls showed no or only low reactivity to HTLV-III envelope (1 : 80 and 100). However, three out of five anti-HTLV-I-positive sera exhibited weak cross-reactivities with HTLV-III. The reactivities were expressed as less than 1 : 160, except for one case (1 : 720). They were considered to be nonspecific since they were negative for HTLV-III antibodies in the radioimmunoprecipitation studies.
mesh_terms: D000163:Acquired Immunodeficiency Syndrome / Q000276:immunology*; D000914:Antibodies, Viral / Q000276:immunology; D002460:Cell Line; D003588:Cytopathogenic Effect, Viral; D017977:Deltaretrovirus / Q000145:classification / Q000276:immunology*; D005455:Fluorescent Antibody Technique; D006467:Hemophilia A / Q000276:immunology / Q000382:microbiology; D006801:Humans; D009500:Neutralization Tests; D011863:Radioimmunoassay; D012191:Retroviridae Proteins / Q000276:immunology
chemical_list: D000914:Antibodies, Viral; D012191:Retroviridae Proteins