Glassy MC, Ferrone S. Ia antigen expression is increased on tunicamycin-resistant human B-lymphoid cells.
CLINICAL IMMUNOLOGY AND IMMUNOPATHOLOGY 1984;
32:90-100. [PMID:
6610518 DOI:
10.1016/0090-1229(84)90046-1]
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Abstract
Cultured human B-lymphoid cells WIL-2 were mutated with ethylmethane sulfonate and selected for resistance to tunicamycin, an antibiotic that selectively inhibits N-linked glycosylation. Ultrastructural analysis of five isolated tunicamycin-resistant mutants (TMR) showed changes in surface microvilli, dilation of the endoplasmic reticulum, and an increase in surface myelin figures. Cytofluorometric analysis of TMR cells incubated with anti-HLA monoclonal antibodies showed a normal density of HLA-A, B antigens and an increased density of Ia antigens. The properties of these TMR mutants have remained stable for at least 18 months. These TMR cells may serve as a useful model to study the biochemical events in the processing and expression of Ia antigens.
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