Endocrine disrupting chemicals, phthalic acid and nonylphenol, activate Pregnane X receptor-mediated transcription

Hisashi Masuyama, Yuji Hiramatsu, Mamoru Kunitomi, Takafumi Kudo, Paul N. MacDonald

Research output: Contribution to journalArticle

164 Citations (Scopus)

Abstract

Recently, Pregnane X receptor (PXR), a new member of the nuclear receptor superfamily, was shown to mediate the effects of several steroid hormones, such as progesterone, glucocorticoid, pregnenolone, and xenobiotics on cytochrome P450 3A genes (CYP3A) through the specific DNA sequence for CYP3A, suggesting that PXR may play a role in steroid hormone metabolism. In this paper, we demonstrated that phthalic acid and nonylphenol, endocrine-disrupting chemicals (EDCs), stimulated PXR-mediated transcription at concentrations comparable to those at which they activate estrogen receptor-mediated transcription using a transient reporter gene expression assay in COS-7 cells. However, bisphenol A, another EDC, had no effect on PXR-mediated transcription, although this chemical significantly enhanced ER-mediated transcription. In the yeast two-hybrid protein interaction assay, PXR interacted with two nuclear receptor coactivator proteins, steroid hormone receptor coactivator-1 and receptor interacting protein 140, in the presence of phthalic acid or nonylphenol. Thus, EDC-occupied PXR may regulate its specific gene expression through the receptor-coactivator interaction. In contrast, these EDCs had no effect on the interaction between PXR and suppressor for gal 1, a component of proteasome. Finally, the expression of CYP3A1 mRNA in the liver of rats exposed to phthalic acid or nonylphenol markedly increased compared with that in rats treated with estradiol, bisphenol A, or ethanol as assessed by competitive RT-PCR. These data suggest that EDCs may affect endocrine functions by altering steroid hormone metabolism through PXR.

Original languageEnglish
Pages (from-to)421-428
Number of pages8
JournalMolecular Endocrinology
Volume14
Issue number3
DOIs
Publication statusPublished - 2000

Fingerprint

Endocrine Disruptors
Hormones
Cytochrome P-450 CYP3A
Steroids
Nuclear Receptor Co-Repressor 1
Nuclear Receptor Coactivators
Nuclear Receptor Coactivator 1
Gene Expression
Pregnenolone
nonylphenol
phthalic acid
pregnane X receptor
COS Cells
Xenobiotics
Proteasome Endopeptidase Complex
Cytoplasmic and Nuclear Receptors
Reporter Genes
Estrogen Receptors
Glucocorticoids
Genes

ASJC Scopus subject areas

  • Molecular Biology
  • Endocrinology, Diabetes and Metabolism

Cite this

Endocrine disrupting chemicals, phthalic acid and nonylphenol, activate Pregnane X receptor-mediated transcription. / Masuyama, Hisashi; Hiramatsu, Yuji; Kunitomi, Mamoru; Kudo, Takafumi; MacDonald, Paul N.

In: Molecular Endocrinology, Vol. 14, No. 3, 2000, p. 421-428.

Research output: Contribution to journalArticle

Masuyama, Hisashi ; Hiramatsu, Yuji ; Kunitomi, Mamoru ; Kudo, Takafumi ; MacDonald, Paul N. / Endocrine disrupting chemicals, phthalic acid and nonylphenol, activate Pregnane X receptor-mediated transcription. In: Molecular Endocrinology. 2000 ; Vol. 14, No. 3. pp. 421-428.
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