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- W2147491011 abstract "Previous epidemiological studies with humans and laboratory studies with chickens and rats linked trichloroethylene (TCE) exposure to cardiac defects. Although the cardiac defects in humans and laboratory animals produced by TCE are diverse, a majority of them involves valvular and septal structures. Progenitors of the valves and septa are formed by an epithelial-mesenchymal cell transformation of endothelial cells in the atrioventricular (AV) canal and outflow tract areas of the heart. Based on these studies, we hypothesized that TCE might cause cardiac valve and septa defects by specifically perturbing epithelial-mesenchymal cell transformation. We tested this hypothesis using an in vitro chick-AV canal culture model. This study shows that TCE affected several elements of epithelial-mesenchymal cell transformation. In particular, TCE blocked the endothelial cell-cell separation process that is associated with endothelial activation. Moreover, TCE inhibited mesenchymal cell formation throughout the concentration range tested (50-250 ppm). In contrast, TCE had no effect on the cell migration rate of the fully formed mesenchymal cells. Finally, the expression of 3 proteins (selected as molecular markers of epithelial-mesenchymal cell transformation) was analyzed in untreated and TCE-treated cultures. TCE inhibited the expression of the transcription factor Mox-1 and extracellular matrix (ECM) protein fibrillin 2. In contrast, TCE had no effect on the expression of alpha-smooth muscle actin. These data suggest that TCE may cause cardiac valvular and septal malformations by inhibiting endothelial separation and early events of mesenchymal cell formation in the heart." @default.
- W2147491011 created "2016-06-24" @default.
- W2147491011 creator A5082833715 @default.
- W2147491011 date "2000-01-01" @default.
- W2147491011 modified "2023-10-13" @default.
- W2147491011 title "Trichloroethylene Inhibits Development of Embryonic Heart Valve Precursors in Vitro" @default.
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- W2147491011 doi "https://doi.org/10.1093/toxsci/53.1.109" @default.
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