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(Received for publication, June 5, 1996, and in revised form, July 30, 1996)
From the First Department of Internal Medicine, Gunma University
School of Medicine, 3-39-15 Showa-machi, Maebashi 371, Japan
To gain additional insights into the negative
gene regulatory action by triiodothyronine (T3), we
isolated a 2-kilobase pair 5
Volume 271, Number 44,
Issue of November 1, 1996
pp. 27919-27926
©1996 by The American Society for Biochemistry and Molecular Biology, Inc.
-flanking region of the mouse
preprothyrotropin-releasing hormone (ppTRH) gene and characterized the
DNA elements mediating inhibitory regulation by T3 in the
promoter region. In GH4C1 cells, the expression
of the 2-kilobase pair mouse ppTRH 5
-flanking region fused to the
luciferase reporter gene occurred by transfection and was significantly
suppressed by T3. In contrast, T3 suppression
was not observed in T3 receptor (T3R)-deficient
CV-1 cells, suggesting that T3Rs were required for the
negative regulation. Cotransfected mouse T3R
1,
1,
and
2 possessed indistinguishable potency for the negative
regulation. Deletion analysis localized the element mediating the
negative regulation to the region between
83 and +46, and the
sequence downstream of the transcription start site (TSS) between +12
and +46 was found to be essential for the inhibitory regulation. In
mobility shift assays, only T3R monomers bound to the
element containing a T3 response element half-site at
57.
No apparent T3R binding was observed to the element
downstream of TSS. Neither the T3 response element
half-site nor the element downstream of the TSS confer T3
suppression individually in heterologous promoters. These results
indicate that the negative regulation of murine ppTRH gene by
T3 might be mediated by the cooperation of T3R
monomers with unknown factor(s) interacting with the element downstream
of the TSS.
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