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The Journal of Immunology, Vol 150, Issue 11 4934-4942, Copyright © 1993 by American Association of Immunologists

ARTICLES

Developmental and cytokine-mediated regulation of MHC class II gene promoter occupancy in vivo

CJ Kara and LH Glimcher
Department of Cancer Biology, Harvard School of Public Health, Boston, MA.

The class II genes of the major histocompatibility complex are a family of genes whose expression is regulated developmentally in cells of the B lineage and by IFN-gamma in many other cell types. Using the approach of in vivo footprinting, which allows for the examination of protein- promoter interactions within intact cells, we demonstrated a transition from unoccupied to occupied to once again unoccupied class II promoters in cell lines representing the developmental pathway of B cells. IFN- gamma treatment of HeLa cells led to increased promoter occupancy of the DR alpha and DR beta promoters at the same sites that are constitutively bound in mature B cells. No IFN-gamma-specific binding site was induced. Additionally, an octamer element in the DR alpha gene displayed preferential binding in B cells. These results demonstrate that changes in the transcription of the class II genes are associated with changes in factor binding at the promoter in vivo. Moreover, given the ubiquity of class II promoter binding proteins, these results suggest that throughout B cell development and upon IFN-gamma stimulation, the accessibility of class II promoter DNA is subject to regulation.


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