C-Myc Mediates a Hypoxia-induced Decrease in Acetylated Histone H4

Overview

Journal Biochimie

Specialty Biochemistry

Date 2009 Jul 15

PMID 19596041

Citations 5

Authors

Qin Li

Max Costa

Affiliations

Soon will be listed here.

Abstract

Global acetylation of histone H4 is a mark of gene transcriptional activation. The c-Myc transcription factor binds to specific DNA sites in cellular chromatin and induces the acetylation of histone H4. In this study, hypoxia (1% Oxygen) induced a decrease in both global acetylated histone H4 (AcH4) and c-Myc in human lung carcinoma A549 cells and in human bronchial epithelial Beas-2B cells, The decline was more striking in A549 cells compared to Beas2-B cells, when cells were exposed to hypoxic stress for 24 h. Further studies showed that these alterations of global AcH4 can be attributed to the decrease in c-Myc protein levels. While hypoxia-induced gene activation is known to be mediated by Hypoxia Response Elements (HRE), the mechanism for down-regulation of genes by hypoxia is not known. The decrease in c-Myc protein levels induced by hypoxia may contribute to hypoxia-induced gene repression.

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