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Antibody-dependent cellular cytotoxicity detects type- and strain-specific antigens among human immunodeficiency virus types 1 and 2 and simian immunodeficiency virus SIVmac isolates - PubMed

Antibody-dependent cellular cytotoxicity detects type- and strain-specific antigens among human immunodeficiency virus types 1 and 2 and simian immunodeficiency virus SIVmac isolates

K Ljunggren et al. J Virol. 1989 Aug.

Abstract

Human cell lines were infected with different strains of human immunodeficiency virus types 1 and 2 (HIV-1 and HIV-2) as well as with a simian immunodeficiency virus SIVmac isolate and used as targets in an antibody-dependent cellular cytotoxicity (ADCC) assay. Sera from HIV-1- or HIV-2-infected subjects provided the antibody, and lymphocytes from normal donors provided the effector cells. About 60% of HIV-1 antibody-positive sera mediated ADCC when tested against any given HIV-1 isolate-infected target cell (human T-cell lymphotropic virus type IIIB, B40, A2587), and about 75% of HIV-2 antibody-positive sera mediated ADCC when tested against target cells infected with HIV-2 isolates (lymphadenopathy-associated virus type 2 and SBL-6669) or simian immunodeficiency virus from macaques. Within each type, individual sera showed different reactivity patterns, and the probability that a serum was ADCC positive was higher when it was tested against several strains. When the ADCC reactivity of sera against different strains was compared, diversity as detected by ADCC appeared to be greater among HIV-1 strains than among HIV-2 strains. For HIV-1, 54 to 67% of the sera gave concordant ADCC reactions, whereas for HIV-2 and SIVmac, 91% of the sera gave concordant results. Almost no strain-specific differences were seen between SBL-6669 and lymphadenopathy-associated virus type 2. As we determined previously, HIV-1 and HIV-2 did not cross-react in ADCC. The results indicated that HIV-1 and HIV-2 antibody-positive sera mediate both strain- and type-specific ADCC. HIV-2 antibody-positive sera seem to mediate ADCC with broader reactivity and to a higher frequency compared with HIV-1 antibody-positive sera.

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Antibody-dependent cellular cytotoxicity detects type- and strain-specific antigens among human immunodeficiency virus types 1 and 2 and simian immunodeficiency virus SIVmac isolates - PubMed