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Nucleic Acids Research, Vol 25, Issue 13 2635-2639, Copyright © 1997 by Oxford University Press

ARTICLES

Analysis of chromatin structure of rat alpha1-acid glycoprotein gene; changes in DNase I hypersensitive sites after thyroid hormone, glucocorticoid hormone and turpentine oil treatment

T Matsukawa, H Kawasaki, M Tanaka and Y Ohba
Faculty of Pharmaceutical Sciences, Kanazawa University, 13-1 Takara- machi, Kanazawa, Ishikawa 920, Japan.

Transcription of the ratalpha1-acid glycoprotein (AGP) gene is activated by glucocorticoid, thyroid hormone (T3) and cytokines. Following these treatments, the chromatin structure of this gene was analyzed by means of digestion with DNase I or micrococcal nuclease. Four DNase I hypersensitive sites were observed in the 5'-upstream region of the rat AGP gene of liver cells. They were designated HS1, HS2, HS3 and HS4 (3'-->5'). After T3treatment the sensitivity of HS1 and HS2 increased and after dexamethasone (Dex) treatment that of all four sites did so. Three new sites appeared after turpentine oil treatment, while the sensitivities of HS3 and HS4 increased. We conclude that transcriptional activation of the gene by T3and Dex have very similar mechanisms, but that at the inflammation stage they become slightly different. The increase in sensitivity at HS1 and HS2 after T3treatment in vivo was successfully reproduced in a cell-free system by in vitro treatment with T3. HS1, HS2 and HS3 were also sensitive for micrococcal nuclease.
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