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J Biol Chem, Vol. 274, Issue 23, 16198-16205, June 4, 1999
From the George Whipple Laboratory for Cancer Research, Department
of Pathology, Urology, Radiation Oncology, and The Cancer Center,
University of Rochester Medical Center,
Rochester, New York 14642
In situ hybridization analysis
demonstrated that abundant testicular orphan receptor (TR4) transcripts
were detected in kidney, intestine, and bone, which are vitamin
D3 target organs. Cell transfection studies also
demonstrated that the expression of the vitamin D3 target
gene, 25-hydroxyvitamin D3 24-hydroxylase, can be repressed
by TR4 through high affinity binding (Kd = 1.32 nM) to the direct repeat 3 vitamin D3 receptor
response element (DR3VDRE). This TR4-mediated repression of DR3VDRE is in contrast to our earlier report that TR4 could induce thyroid hormone
target genes containing a direct repeat 4 thyroid hormone response
element (DR4T3RE). Electrophoretic mobility shift assay using several TR4 monoclonal antibodies when combined with either TR4-DR3VDRE or TR4-DR4T3RE showed a distinct supershifted
pattern, and proteolytic analysis further demonstrated distinct
digested peptides with either TR4-DR3VDRE or TR4-DR4T3RE.
These results may therefore suggest that TR4 can adapt to different
conformations once bound to DR3VDRE or DR4T3RE. The
consequence of these different conformations of TR4-DR3VDRE and
TR4-DR4T3RE may allow each of them to recruit different
coregulators. The differential repression of TR4-mediated DR3VDRE and
DR4T3RE transactivation by the receptor interacting protein
140, a TR4 coregulator, further strengthens our hypothesis that the
specificity of gene regulation by TR4 can be modulated by protein-DNA
and protein-protein interactions.
Differential Regulation of Direct Repeat 3 Vitamin D3
and Direct Repeat 4 Thyroid Hormone Signaling Pathways by the Human TR4
Orphan Receptor
Copyright © 1999 by The American Society for Biochemistry and Molecular Biology, Inc.
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