Refractory depression in a patient with peripheral resistance to thyroid hormone (RTH) and the effect of triiodothyronine treatment

Carlos Fardella; Rocío Artigas; Sergio Gloger; Marcela Jiménez; Cristian Carvajal; Paola Krall; Danilo Quiroz; Carmen Campino; Lorena Mosso
June 2007
Endocrine (1355008X);Jun2007, Vol. 31 Issue 3, p272
Academic Journal
We here described a 39-year-old woman with a severe chronic mood disorder, refractory to antidepressive therapy who showed a significant improvement after a self-prescription of high doses of liothyronine (T3). A modified Refetoff protocol was carried out to study the role of thyroid hormones on her clinical and biochemical responses. Depression severity was assessed by the HAM-D and MADRS Depression Rating Scales. Sequencing of Thyroid Receptors (TR) α1 and β1 genes was done. At the final stage of the study, plasma T3 and free T3 were >800 ng/dl (80–180) and 1409 pg/dl (230–420), respectively. No changes in the cardiovascular parameters, alkaline phosphatase isoenzymes, creatinine kinase, or ferritin were observed. However, an improvement in mood was detected by specific scores (HAM-D 24 to 8; MADRS 40 to 11). No mutations in DNA- and hormone-binding-domains of TRβ1 and TRα1 genes were found in proband, suggesting that the defect could be due to an unknown mutation in either the TR gene or a post receptor abnormality. These results support the existence of a peripheral RTH manifestation as a refractory chronic depression reverted by high doses of T3. Screening for RTH in refractory chronic depression may provide an alternative treatment for this psychiatric condition.


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