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J. Biol. Chem., Vol. 276, Issue 6, 3727-3732, February 9, 2001

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The Wilms' Tumor Gene Product (WT1) Modulates the Response to 1,25-Dihydroxyvitamin D₃ by Induction of the Vitamin D Receptor^*

Ulrich Maurer, Frederic Jehan^§, Christoph Englert^¶, Gabriele Hübinger, Eckhart Weidmann, Hector F. DeLuca^§, and Lothar Bergmann

From the Department of Internal Medicine III, University of Ulm, 89081 Ulm, Germany, ^§ Department of Biochemistry, College of Agricultural and Life Sciences, University of Wisconsin-Madison, Madison, WI 53706, ^¶ Forschungszentrum Karlsruhe, Institut für Genetik, 76021 Karlsruhe, Germany, and  Department of Internal Medicine III, Johann Wolfgang Goethe University, 60590 Frankfurt, Germany

The Wilms' tumor gene (wt1) encodes a transcription factor involved in urogenital development, in particular in renal differentiation, and in hematopoietic differentiation. Differentiation of a number of solid tumor and leukemic cells lines can be mediated by 1,25-dihydroxyvitamin D₃. This is predominantly mediated by the nuclear receptor for 1,25-dihydroxyvitamin D₃, the vitamin D receptor (VDR). In initial experiments addressing a possible link between WT1 and VDR, we observed a correlated expression of WT1 and VDR mRNA in samples from renal tissues. HT29 colon carcinoma cells, stably transfected to express WT1, exhibited elevated endogenous VDR levels compared with control cells transfected with a control construct. Elevated VDR expression was found in wt1-transfected human embryonic kidney 293 cells, as well. In transient cotransfection experiments, we observed an activation of a vdr promoter reporter by WT1 through a WT1 recognition element, indicating transcriptional regulation of the vdr gene expression by WT1. The responsive sequence element was specifically bound by wild-type, but not by mutated WT1, in electrophoretic mobility shift assays. HT29 colon carcinoma cells, which respond to 1,25-dihydroxyvitamin D₃ with slow induction of growth arrest, were investigated for the influence of WT1 on 1,25-dihydroxyvitamin D₃-mediated growth suppression. Although HT29 cells transfected with a control construct responded moderately to 1,25-dihydroxyvitamin D₃, the response of HT29 cells expressing WT1 was strikingly enhanced. Stimulation with dihydroxyvitamin D₃ caused an up to 3-fold reduction in the growth rate of different HT29 clones expressing WT1 as compared with control cells lacking WT1 expression. Thus, induction of VDR by WT1 leads to an enhanced response to 1,25-dihydroxyvitamin D₃. We conclude that the vitamin D receptor gene is a target for transcriptional activation by WT1, suggesting a possible physiological role of this regulatory pathway.

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