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The Journal of Immunology, 2000, 165: 7017-7024.
Copyright © 2000 by The American Association of Immunologists

Activation of MHC Class I, II, and CD40 Gene Expression by Histone Deacetylase Inhibitors1

William J. Magner*, A. Latif Kazim{dagger}, Carleton Stewart{ddagger}, Michelle A. Romano*, Geoffrey Catalano*, Catherine Grande*, Nicholas Keiser*, Frank Santaniello* and Thomas B. Tomasi2,*,§

Departments of * Immunology, {dagger} Biophysics, and {ddagger} Pathology, Roswell Park Cancer Institute, Buffalo, NY 14263; and § Departments of Medicine and Microbiology, State University of New York, School of Medicine and Biomedical Sciences, Buffalo, NY 14214

Epigenetic mechanisms are involved in regulating chromatin structure and gene expression through repression. In this study, we show that histone deacetylase inhibitors (DAIs) that alter the acetylation of histones in chromatin enhance the expression of several genes on tumor cells including: MHC class I, II, and the costimulatory molecule CD40. Enhanced transcription results in a significant increase in protein expression on the tumor cell surface, and expression can be elicited on some tumors that are unresponsive to IFN-{gamma}. The magnitude of induction of these genes cannot be explained by the effect of DAIs on the cell cycle or enhanced apoptosis. Induction of class II genes by DAIs was accompanied by activation of a repressed class II transactivator gene in a plasma cell tumor but, in several other tumor cell lines, class II was induced in the apparent absence of class II transactivator transcripts. These findings also suggest that the abnormalities observed in some tumors in the expression of genes critical to tumor immunity may result from epigenetic alterations in chromatin and gene regulation in addition to well-established mutational mechanisms.




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