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- W2122643576 abstract "Exposure to the environmental contaminant, 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD), produces hydronephrosis in developing mice, the etiology of which involves hyperplasia within the ureteric luminal epithelium. Dysregulation of epidermal growth factor receptor (EGFR), EGF, and transforming growth factor-α expression has been implicated as playing a role in TCDD-induced hydronephrosis. In this study, changes in the expression of genes encoding the EGFR and its cognate ligands in response to TCDD were evaluated within the developing ureter. C57BL/6 dams were injected ip with 30 μg/kg TCDD on gestational day (GD) 13 or 16 and fetal tissues removed on GD 17. Aryl hydrocarbon receptor (AHR) and AHR nuclear translocator messenger RNA (mRNA) were expressed in control and treated fetal tissues at GD 14 and 17. Prototypical AHR target genes, Cyp1a1, Cyp1a2, and Cyp1b1 were upregulated in TCDD-exposed fetal tissues, demonstrating AHR transcriptional activity at these developmental stages. Amphiregulin (AREG) and epiregulin, ligands for the EGFR, were induced at the transcriptional level in ureters of fetuses exposed to TCDD for 24 h. AREG mRNA was also induced by TCDD dose- and time-dependently in the mouse hepatoma cell line Hepa-1c1c7 (Hepa-1), mimicking the induction patterns of CYP1A1 mRNA. Other AHR ligands also induced AREG mRNA in Hepa-1 cells. Furthermore, variant Hepa-1 cells (TAOBPrc1 cells) virtually deficient in the AHR failed to display an increase in AREG mRNA in response to TCDD. Taken together, these data suggest that the AHR cross talks with the EGFR signaling pathway by directly inducing the expression of growth factors that are important for EGFR signaling in the developing mouse ureter." @default.
- W2122643576 created "2016-06-24" @default.
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- W2122643576 date "2006-06-13" @default.
- W2122643576 modified "2023-10-15" @default.
- W2122643576 title "In Utero Exposure to 2,3,7,8-Tetrachlorodibenzo-p-dioxin Induces Amphiregulin Gene Expression in the Developing Mouse Ureter" @default.
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- W2122643576 doi "https://doi.org/10.1093/toxsci/kfl090" @default.
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