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- W4313333860 abstract "Abstract We compared HLA class II expression in a human melanoma line (a nonprofessional APC), induced by IFN-γ or by stable transfection with CIITA, with constitutive class II expression in an EBV-transformed B lymphoblastoid cell line (a professional APC) from the same donor. IFN-γ-induced and CIITA-transfected melanoma cells expressed DR, DP, and DQ at levels similar to those expressed by the professional APC; however, DP and DQ proteins and DM-dependent DR epitopes were delayed in appearing on the cell surface when induced by IFN-γ. The delay in cell surface expression of some IFN-γ-induced class II epitopes was observed even though Northern blots demonstrated class II and DM genes to be coordinately transcribed and their mRNA levels to be equivalent to that in B lymphoblastoid cells. Confocal microscopy suggests that discoordinate cell surface expression of class II results from different intracellular trafficking for IFN-γ-induced class II proteins in the melanoma line compared with that in professional APCs. Specifically, although DR and DM proteins were present 2 days after IFN-γ induction, colocalization of DR and DM proteins intracellularly was not apparent in cells at any time after induction. Failure of DR and DM proteins to colocalize suggests that IFN-γ-induced cells lack an intracellular MIIC-like compartment. The absence of a compartment containing DR and DM to facilitate interaction between the two proteins may account for the delayed surface expression of class II epitopes whose formation requires both class II and DM." @default.
- W4313333860 created "2023-01-06" @default.
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- W4313333860 date "1998-04-01" @default.
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- W4313333860 title "Discoordinate Surface Expression of IFN-γ-Induced HLA Class II Proteins in Nonprofessional Antigen-Presenting Cells with Absence of DM and Class II Colocalization" @default.
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- W4313333860 doi "https://doi.org/10.4049/jimmunol.160.7.3207" @default.
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