Abstract
The major histocompatibility complex (MHC) class II transactivator (CIITA) typically is required for both constitutive and inducible expression of MHC class II genes. However, transcription of class II MHC genes has been observed in specific cell types (e.g., thymic epithelial cells) in CIITA-deficient mice as well as in specific situations (e.g., following viral infections or in natural killer [NK]/target cell interaction). These observations have been interpreted by some to indicate that a CIITA-independent pathway of class II gene expression might be germane to processes such as the acquisition of tolerance during thymic selection or in the evasion of immune surveillance by a subset of viruses. One of the most striking examples of CIITA-independent, inducible class II gene expression has involved the de novo expression of class II MHC molecules on respiratory epithelial cells following infection by human parainfluenza virus type 3 (HPIV3). We report here that despite careful analysis using multiple techniques, we have been unable to detect HPIV3-dependent, CIITA-independent (or CIITA-dependent) induction of class II MHC genes. Thus, whereas there may still be an intriguing role for CIITA-independent gene expression in facets of the immune response, this is unlikely to manifest in the analysis of HPIV3 infection of respiratory epithelial cells.
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Radosevich, M., Ono, S.J. MHC class II gene expression is not induced in HPIV3-infected respiratory epithelial cells. Immunol Res 30, 125–138 (2004). https://doi.org/10.1385/IR:30:2:125
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DOI: https://doi.org/10.1385/IR:30:2:125