Activation transcription factor 1 involvement in the regulation of murine H-2Dd expression.

The Journal of Biological Chemistry
N IshiguroD Meruelo

Abstract

Resistance to radiation leukemia virus-induced leukemia is correlated with an increase in H-2D expression on the thymocyte surface. Recently, it has been shown that elevated H-2Dd expression on the infected thymocyte is a result of elevated mRNA transcription and that the transcriptional increase is correlated with elevated levels of a DNA binding activity, H-2 binding factor 1 (H-2 BF1), which recognizes the 5'-flanking sequences (5'-TGACGCG-3') of the H-2Dd gene. This target for transcription factor binding has been found to be identical in the 5'-regulatory region of 12 rodent class I genes, nine of which have been shown to be functional genes. Furthermore, this cis-element is found 5' of 20 primate class I genes (15 human genes), seven of which are known to be functional. Here, we demonstrate that activation transcription factor 1 (ATF-1) is one component of H-2 BF1. In addition, the levels of ATF-1 mRNA in uninfected and radiation leukemia virus-infected thymocytes parallel those of H-2Dd mRNA, and therefore, it is suggested that ATF-1 up-regulates the transcription of the H-2Dd gene after radiation leukemia virus infection of thymocytes. Transfection experiments also demonstrate that ATF-1 activates a reporter plasmid tha...Continue Reading

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Citations

Aug 1, 1997·European Journal of Immunogenetics : Official Journal of the British Society for Histocompatibility and Immunogenetics·G D BrownD Meruelo
Feb 9, 2005·The Journal of Immunology : Official Journal of the American Association of Immunologists·T Kevin HowcroftDinah S Singer

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