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Title:DNA Repair, Redox Regulation and Modulation of Estrogen Receptor Alpha Mediated Transcription
Author(s):Curtis-Ducey, Carol Dianne
Doctoral Committee Chair(s):Nardulli, Ann M.
Department / Program:Molecular and Integrative Physiology
Discipline:Molecular and Integrative Physiology
Degree Granting Institution:University of Illinois at Urbana-Champaign
Subject(s):Biology, Physiology
Abstract:Interaction of estrogen receptor alpha (ERalpha) with 17beta-estradiol (E2) facilitates binding of the receptor to estrogen response elements (EREs) in target genes, which in turn leads to recruitment of coregulatory proteins. To better understand how estrogen-responsive genes are regulated, our laboratory identified a number of proteins that associate with the DNA-bound ERalpha. Our studies demonstrate that the nonmetastatic protein 23 homolog 1 (NM23-H1) interacts with ERalpha, increases ERalpha-ERE complex formation, influences ERalpha-mediated transcription and associates with the promoter region of the endogenous estrogen-responsive progesterone receptor (PR) gene. Furthermore, we show that a second protein, Apurinic/apyrimidinic endonuclease 1 or redox factor-1 (Ape1/Ref-1), interacts with ERalpha, promotes the ERalpha-ERE interaction, influences ERalpha-mediated transactivation, and selectively associates with endogenous, estrogen-responsive genes in MCF-7 cells. Our findings suggest that NM23-H1 and Ape1/Ref-1 are instrumental in modulating expression of estrogen-responsive genes. Interestingly, we demonstrate that Ape1/Ref-1 and NM23-H1, as well as the oxidative stress proteins Cu/Zn superoxide dismutase (SOD1), thioredoxin (Trx) and protein disulfide isomerase (PDI) are overexpressed in human breast cancer tissues. These studies provide a novel link between DNA repair, redox regulation and modulation of ERalpha-mediated transcription.
Issue Date:2009
Description:75 p.
Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2009.
Other Identifier(s):(MiAaPQ)AAI3391919
Date Available in IDEALS:2015-09-28
Date Deposited:2009

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