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Updated: Oct 23, 2026

Prediction and Validation of Gene Regulatory Elements Activated During Retinoic Acid Induced Embryonic Stem Cell Differentiation
Published on: June 21, 2016
UV irradiation upregulates Egr-1 expression at transcription level
R P Huang1, Y Fan, A L Boynton
1Molecular Medicine, Northwest Hospital, Seattle, Washington 98125, USA. rphuang@nwlink.com
Abstract:
UVC irradiation rapidly and strongly induces protein expression of the early growth response-1 gene (Egr-1) encoding a transcription factor which may have a protective function against UV damage. In this paper, we further investigate mechanisms responsible for such induction. We show that UVC irradiation also induced Egr-1 mRNA expression, increased transcription rate by nuclear run-on assay and stimulated Egr-1 promoter activity by CAT assay. The Egr-1 mRNA stability remained unchanged in UVC-treated cells. On the other hand, UVC irradiation slightly extended Egr-1 protein half-life. The induction of Egr-1 by UVC was observed in many different cell types. UVA and UVB also strongly induced Egr-1 expression. These results indicate that UVC regulates Egr-1 expression at transcription level. The induction pattern of Egr-1 by UV suggests the importance of Egr-1 in the UV response.
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