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- W2023346312 abstract "Thyroid hormone (T3) is an important regulator of gut mucosal development and differentiation, inducing intestinal alkaline phosphatase (IAP) and repressing lactase gene transcription. In contrast, cyclin D1 (CD1) appears to be a growth promoter in the gut, functioning to maintain the undifferentiated state. The present studies were designed to examine the effects of CD1 on T3 action within intestinal epithelia. Caco-2 cells were maintained in hypothyroid medium and transiently transfected with either rat lactase (3.0 kb) or human IAP (2.4 kb) luciferase (Luc) reporter plasmids. Coaansfections were carried out using two T3 receptor (TR) isoforms, TRW1 and TRβ-1, as well as plasmids expressing CDl, CD3, CA, or CB1. Cells were then treated ±10 nmol/L T3 for 24 hours and luciferase activity was determined. with T3 treatment, IAP-Luc activity was induced (TRα-1 = eightfold, TRβ-1 = ninefold), but these effects were dramatically inhibited (>50%) by CD1 and CD3. In contrast, CA and CBl did not alter T3-mediated IAP gene activation. The ability of CD1 and CD3 to inhibit T3 action was also tested in the context of the lactase gene, which is negatively regulated by T3. As expected, lactase reporter gene activity was repressed by T3 treatment in the case of both receptor isoforms, TRW1 = 30% and TRP-1 = 40%. In contrast to its effects on the IAP gene, CD1 did not inhibit T3-mediated changes in lactase reporter gene activity. The D-type cyclins (CD1 and CD3), but not CA or CB1, specifically inhibit T3-mediated activation of the IAP gene. In contrast, the D-type cyclins do not inhibit T3-mediated repression of the lactase gene. These studies have identified a novel molecular interaction that exists between the pathways of growth and differentiation within intestinal epithelia." @default.
- W2023346312 created "2016-06-24" @default.
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- W2023346312 date "2000-04-01" @default.
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- W2023346312 title "Thyroid hormone and the D-type cyclins interactin regulating enterocyte gene transcription" @default.
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- W2023346312 doi "https://doi.org/10.1016/s0016-5085(00)86378-7" @default.
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