Abstract
Spontaneous mutants with altered HLA-A,B,C response to interferon-alpha (IFN-alpha) were isolated from the human thymus leukemia cell line Molt 4. Using fluorescein isothiocyanate (FITC)-conjugated W6/32 (a monoclonal antibody to HLA-A,B,C) and the fluorescence-activated cell sorter, the cells with highest and lowest fluorescence after 24-48 h of IFN-alpha treatment were selected and expanded. After several cycles of selection, mutant clones with low (greater than 10% of wild-type) and high (three times better) response were obtained. A similar protocol was employed to derive high responder mutants with the monoclonal antibody YT76, which recognises a subset of HLA strongly induced by IFN-alpha. Stable clones were derived for which YT-HLA induction was 7-fold that of Molt 4 cells and for which HLA induction occurred at 100-fold lower concentrations of IFN-alpha. The high response phenotype of the mutants was not accompanied by a significant increase in the constitutive level of expression of HLA-A,B,C (in the absence of IFN). The increase in the level of HLA-A,B,C expression after IFN-alpha treatment is mostly accounted for by the increase in the expression of a subset of HLA molecules, detected by the monoclonal antibody YT76 including HLA-B molecules.
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