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Acetaminophen exhibits weak antiestrogenic activity in human endometrial adenocarcinoma (Ishikawa) cells.

Authors
Dowdy-J; Brower-S; Miller-MR
Source
Toxicol Sci 2003 Mar; 72(1):57-65
NIOSHTIC No.
20023518
Abstract
The purpose of this study was to test the hypothesis that acetaminophen would alter an estrogen-regulated process in human cells that express endogenous estrogen receptor alpha and beta (ERalpha and ERbeta). Specifically, the extent to which acetaminophen altered the expression of estrogen-inducible alkaline phosphatase in endometrial adenocarcinoma (Ishikawa) cells and directly interacted with ERbeta and ERalpha was determined. Ishikawa cells were exposed to estradiol and/or to a range of concentrations of acetaminophen for four days, and alkaline phosphatase activity was measured spectrophotometrically. Acetaminophen inhibited both basal and estradiol-induced alkaline phosphatase activity in Ishikawa cells in a concentration-dependent manner. The reduction of Ishikawa cell alkaline phosphatase was not due to direct inhibition of enzyme activity by acetaminophen. Toxic effects of acetaminophen on Ishikawa cells were determined by measuring loss of cellular lactate dehydrogenase to culture medium. High concentrations of acetaminophen (>/=0.5 mM) induced lactate dehydrogenase release from cells and reduced the amount of cellular protein in culture dishes, indicating some acetaminophen-induced reduction of alkaline phosphatase activity might be attributed to toxic effects. However, lower concentrations of acetaminophen significantly reduced alkaline phosphatase activity in the absence of detectable toxicity. Acetaminophen also augmented 4-hydroxy-tamoxifen reduction of alkaline phosphatase activity. Competition binding assays with human ERalpha and ERbeta demonstrated 10(6)-fold molar excess acetaminophen did not directly interact significantly with the ligand-binding domain of either receptor. These studies indicate acetaminophen exerts weak antiestrogenic activity in Ishikawa cells without directly binding ERalpha or ERbeta.
Keywords
Cell-function; Toxic-effects; Proteins; In-vitro-studies; In-vivo-studies; Laboratory-animals; Animal-studies; Animals; Hormones
Contact
Department of Biochemistry and Molecular Pharmacology, P.O. Box 9142, West Virginia University Health Sciences Center, Morgantown, WV 26506-9142
CODEN
TOSCF2
Publication Date
20030301
Document Type
Journal Article
Email Address
mmiller@hsc.wvu.edu
Fiscal Year
2003
NTIS Accession No.
NTIS Price
Issue of Publication
1
ISSN
1096-6080
NIOSH Division
HELD
Priority Area
Disease and Injury: Fertility and Pregnancy Abnormalities
Source Name
Toxicological Sciences
State
WV
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