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Departments of Medicine (R.E.W., J.P., K.C., S.R.) and Pediatrics (J.P., S.R.) and the J. P. Kennedy, Jr. Mental Retardation Research Center (S.R.), The University of Chicago, Chicago, Illinois 60637; Department of Human Genetics (D.F.), Mount Sinai Medical Center, New York, New York 10029; St. Jude Childrens Research Hospital (T.C.), Department of Developmental Neurobiology, Memphis, Tennessee 38105
Address all correspondence and requests for reprints to: Roy E. Weiss, M.D., Ph.D., Thyroid Study Unit, MC 3090, University of Chicago, 5841 South Maryland Avenue, Chicago, Illinois 60637-1470. E-mail: rweiss{at}medicine.bsd.uchicago.edu
Thyroid hormone responsive genes can be both positively and negatively
regulated by thyroid hormone. TSH is down-regulated by thyroid hormone
and rises during thyroid hormone deprivation. Because both thyroid
hormone receptor (TR)
and ß genes are expressed in the pituitary
gland, it is unclear what the relative roles of TR
and TRß are in
TSH regulation. Experiments using over expression of artificial genes
have yielded conflicting results. The TRß knock-out mouse that lacks
both TRß1 and TRß2 isoforms provides a model to examine the role of
these receptors in TSH regulation. TRß deficient (TRß-/-) and
wild-type (TRß+/+) mice of the same strain were deprived of thyroid
hormone by feeding them a low iodine diet containing propylthiouracil
and were then treated with different doses of L-T3 and
L-T4. Thyroid hormone deprivation rapidly increased the
serum TSH level in both TRß+/+ and TRß-/- mice, reaching a
similar level in the absence of thyroid hormone. In contrast, the
decline of serum TSH by treatment with both L-T3 and
L-T4 was severely blunted in TRß-/- mice, and full
suppression was not achieved with the maximal L-T3 dose of
25 µg/day·mouse. These data indicate that TRß is not required for
the up-regulation of TSH in thyroid hormone deficiency. However,
although TR
alone can mediate thyroid hormone induced TSH
suppression, TRß enhances the sensitivity of TSH down-regulation and
may be essential for the complete suppression of TSH.
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