Abstract
Resistance to thyroid hormone (RTH) is a dominantly inherited syndrome of reduced tissue responsiveness to thyroid hormone (TH) usually due to mutations in the TH receptor β gene (TRβ). We studied pituitary and peripheral tissue responses to graded doses of liothyronine (L-T3) in 5 affected members (2 children and 3 adults) of a family with RTH due to the common TRβ mutation P453T. Overall, the 5 subjects studied exhibited suppressed thyrotropin response to thyrotropin-releasing hormone of 51% ± 8%, 12.1% ± 1.5%, and 6.3% ± 3% of the 100% baseline on 50, 100, and 200 μg/dL L-T3, respectively. This degree of suppression was greater than that observed in subjects with RTH due to other TRβ mutations, indicating less resistance. Compared with normal subjects, however, the family described here demonstrated less suppression by L-T3, compatible with their RTH, although of a mild magnitude. The 2 children with RTH demonstrated less L-T3-mediated suppression of prolactin and cholesterol than the adults. Patients often receive thyroid ablative therapy before the diagnosis of RTH and are left with variable degrees of hypothyroidism. Our results demonstrate that graded doses of L-T3 can be used to evaluate RTH patients, even under the condition of limited thyroid reserve, when results are compared with their baseline. We demonstrate that RTH patients can be evaluated either on or off thyroid hormone and still be distinguished from hypothyroid subjects without RTH.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 85-94 |
| Number of pages | 10 |
| Journal | Journal of Laboratory and Clinical Medicine |
| Volume | 146 |
| Issue number | 2 |
| DOIs | |
| State | Published - Aug 2005 |
| Externally published | Yes |
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ASJC Scopus subject areas
- Medicine(all)
- Pathology and Forensic Medicine
Cite this
Tissue responses to thyroid hormone in a kindred with resistance to thyroid hormone harboring a commonly occurring mutation in the thyroid hormone receptor β gene (P453T). / Wu, Sharon Y.; Sadow, Peter M.; Refetoff, Samuel; Weiss, Roy E.
In: Journal of Laboratory and Clinical Medicine, Vol. 146, No. 2, 08.2005, p. 85-94.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Tissue responses to thyroid hormone in a kindred with resistance to thyroid hormone harboring a commonly occurring mutation in the thyroid hormone receptor β gene (P453T)
AU - Wu, Sharon Y.
AU - Sadow, Peter M.
AU - Refetoff, Samuel
AU - Weiss, Roy E
PY - 2005/8
Y1 - 2005/8
N2 - Resistance to thyroid hormone (RTH) is a dominantly inherited syndrome of reduced tissue responsiveness to thyroid hormone (TH) usually due to mutations in the TH receptor β gene (TRβ). We studied pituitary and peripheral tissue responses to graded doses of liothyronine (L-T3) in 5 affected members (2 children and 3 adults) of a family with RTH due to the common TRβ mutation P453T. Overall, the 5 subjects studied exhibited suppressed thyrotropin response to thyrotropin-releasing hormone of 51% ± 8%, 12.1% ± 1.5%, and 6.3% ± 3% of the 100% baseline on 50, 100, and 200 μg/dL L-T3, respectively. This degree of suppression was greater than that observed in subjects with RTH due to other TRβ mutations, indicating less resistance. Compared with normal subjects, however, the family described here demonstrated less suppression by L-T3, compatible with their RTH, although of a mild magnitude. The 2 children with RTH demonstrated less L-T3-mediated suppression of prolactin and cholesterol than the adults. Patients often receive thyroid ablative therapy before the diagnosis of RTH and are left with variable degrees of hypothyroidism. Our results demonstrate that graded doses of L-T3 can be used to evaluate RTH patients, even under the condition of limited thyroid reserve, when results are compared with their baseline. We demonstrate that RTH patients can be evaluated either on or off thyroid hormone and still be distinguished from hypothyroid subjects without RTH.
AB - Resistance to thyroid hormone (RTH) is a dominantly inherited syndrome of reduced tissue responsiveness to thyroid hormone (TH) usually due to mutations in the TH receptor β gene (TRβ). We studied pituitary and peripheral tissue responses to graded doses of liothyronine (L-T3) in 5 affected members (2 children and 3 adults) of a family with RTH due to the common TRβ mutation P453T. Overall, the 5 subjects studied exhibited suppressed thyrotropin response to thyrotropin-releasing hormone of 51% ± 8%, 12.1% ± 1.5%, and 6.3% ± 3% of the 100% baseline on 50, 100, and 200 μg/dL L-T3, respectively. This degree of suppression was greater than that observed in subjects with RTH due to other TRβ mutations, indicating less resistance. Compared with normal subjects, however, the family described here demonstrated less suppression by L-T3, compatible with their RTH, although of a mild magnitude. The 2 children with RTH demonstrated less L-T3-mediated suppression of prolactin and cholesterol than the adults. Patients often receive thyroid ablative therapy before the diagnosis of RTH and are left with variable degrees of hypothyroidism. Our results demonstrate that graded doses of L-T3 can be used to evaluate RTH patients, even under the condition of limited thyroid reserve, when results are compared with their baseline. We demonstrate that RTH patients can be evaluated either on or off thyroid hormone and still be distinguished from hypothyroid subjects without RTH.
UR - http://www.scopus.com/inward/record.url?scp=23744508429&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=23744508429&partnerID=8YFLogxK
U2 - 10.1016/j.lab.2005.04.005
DO - 10.1016/j.lab.2005.04.005
M3 - Article
C2 - 16099238
AN - SCOPUS:23744508429
VL - 146
SP - 85
EP - 94
JO - Translational Research
JF - Translational Research
SN - 1931-5244
IS - 2
ER -