Arsenic disruption of steroid receptor gene activation: Complex dose-response effects are shared by several steroid receptors.

Arsenic disruption of steroid receptor gene activation: Complex dose-response effects are shared by several steroid receptors. Research Abstract Details 

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Arsenic disruption of steroid receptor gene activation: Complex dose-response effects are shared by several steroid receptors. Abstract Text:

Jack E Bodwell,Julie A Gosse,Athena P Nomikos,Joshua W Hamilton,

Chronic intake of arsenic (As) has been associated with increased risk of cancer, diabetes, developmental and reproductive problems, and cardiovascular disease. Recent studies suggest increased health risks with drinking water levels as low as 5-10 ppb. We previously reported that As disrupts glucocorticoid receptor (GR) mediated transcription in a very complex fashion. Low As levels (0.1-0.7 microM) stimulated transcription, whereas slightly higher levels (1-3 microM) were inhibitory. The DNA binding domain (DBD) was the minimal region of GR required for the response to As. Mutations in the DBD that alter the conformation of the dimerization domain (D-loop) to a DNA-bound GR conformation abolished the stimulatory effect and enhanced the inhibitory response to As. Here we report that receptors for progesterone (PR) and mineralocorticoids display a complex As response similar to that of the GR, suggesting a common mechanism for this effect. The complex response to As is not due to altered steroid or receptor levels. Moreover, a well-characterized GR dimerization mutant displayed a wild-type biphasic response to As for several divergent reporter genes, suggesting that dimerization is not critical for the response to As. Fluorescence polarization studies with purified PR and GR demonstrated that the specific PR/GR-DNA interaction is not altered in the presence of As. These results indicate that the numerous and diverse human health effects associated with As exposure may be mediated, at least in part, through its ability to simultaneously disrupt multiple hormone receptor systems.

Arsenic disruption of steroid receptor gene activation: Complex dose-response effects are shared by several steroid receptors. Publishing Authors By Initials

JE Bodwell,JA Gosse,AP Nomikos,JW Hamilton,

For similar investigative techniques: genetic techniques: gene transfer techniques: transfection research abstracts see: investigative techniques: genetic techniques: gene transfer techniques: transfection research

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Arsenic disruption of steroid receptor gene activation: Complex dose-response effects are shared by several steroid receptors. Journal Published:

PUBLICATION TYPE: Research Support, N.I.H., Extr

Journal: Chemical research in toxicology

VOLUME: 19

Page Numbers: 1619-29

Journal Abbreviation: Chem. Res. Toxicol.

ISSN: 0893-228X

DAY: 3

MONTH: Dec

YEAR: 2006

Arsenic disruption of steroid receptor gene activation: Complex dose-response effects are shared by several steroid receptors. Information

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LANGUAGE: eng

NlmUniqueID: 8807448

Arsenic disruption of steroid receptor gene activation: Complex dose-response effects are shared by several steroid receptors. Keywords Mesh Terms:

KEYWORDS: Transfection

MESH TERMS: genetics

Chemical & Substance for Abstract: Arsenic disruption of steroid receptor gene activation: Complex dose-response effects are shared by several steroid receptors. Information

Substance Name: Arsenic

Registry Number: 7440-38-2

Grant and Affiliation Information for Arsenic disruption of steroid receptor gene activation: Complex dose-response effects are shared by several steroid receptors.

AFFILIATION: Department of Physiology, Dartmouth Medical School, Lebanon, New Hampshire 03756, USA. Jack.E.Bodwell@Dartmouth.edu

Country: United States

AGENCY: United States NIEHS

GRANT: R01 ES011819

ACRONYM: ES

MEDLINETA: Chem Res Toxicol

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