Bexarotene-induced hypothyroidism: Bexarotene stimulates the peripheral metabolism of thyroid hormones
Abstract
OBJECTIVE: Therapy with the retinoid X receptor agonist bexarotene is associated with hypothyroidism caused by decreased pituitary TSH secretion. To evaluate the effects of bexarotene on peripheral thyroid hormone metabolism, we performed a study in athyreotic subjects on a fixed substitution dose with L-T4. DESIGN: The design was an open prospective 6-wk intervention study. METHODS: Ten athyreotic patients with pulmonary metastases of differentiated thyroid carcinoma received 6-wk redifferentiation treatment with 300 mg bexarotene/d. L-T4 doses were kept stable. Before and in the sixth week of therapy, serum levels of total T4, free T4 (FT4), T3, reverse T3 (rT3), and TSH were measured. To study nondeiodinase-mediated thyroid hormone degradation, serum levels of T4 sulfate (T4S) were measured. Recombinant human TSH was administered before and in the sixth week of bexarotene therapy. RESULTS: Bexarotene induced profound decreases in total T4 (56% of baseline), FT4 (47%), T3 (69%), rT3 (51%), and T4S (70%) in all patients, whereas TSH levels were not affected. The T3/rT3 ratio increased by 43%, and the T4S/FT4 ratio increased by 48%. Serum TSH levels before and after recombinant human TSH were unaffected by bexarotene. CONCLUSIONS: In the present study, we demonstrate that increased peripheral degradation of thyroid hormones by a nondeiodinase-mediated pathway contributes to bexarotene induced-hypothyroidism.
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The retinoid bexarotene causes central hypothyroidism in almost all patients, via TSH suppression and non-deiodinase-mediated thyroid hormone increased metabolism.
“The retinoid bexarotene causes CH in almost all patients (22), via TSH suppression (93) and non-deiodinase-mediated thyroid hormone increased metabolism (94).”
From L-T4 therapy in the presence of pharmacological interferents (2020) · cites this paper as [94]
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- Authors
- Smit, J. W. A., Stokkel, M. P. M., Pereira, A. M., Romijn, J. A., & Visser, T. J.
- Affiliations
- Leiden University Medical Center (NL)
- Erasmus MC (NL)
- Corresponding author
- Visser, Theo J.
- Venue
- The Journal of Clinical Endocrinology & Metabolism
- Publisher
- The Endocrine Society
- Published
- 2007-07-01
- Volume
- 92
- Issue
- 7
- Pages
- 2496-2499
- ISSN
- 0021-972X (ISSN-L)
- 1945-7197
- OpenAlex
- W1965266307
- Cited by
- 59
- References
- 22
- Citations by year
- 2025: 3 · 2024: 3 · 2023: 1 · 2022: 2 · 2021: 3 · 2020: 2 · 2019: 4 · 2018: 3 · 2017: 3 · 2016: 7 · 2015: 2 · 2014: 3 · 2013: 4 · 2012: 5
- FWCI
- 2.44
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- The Journal of Clinical Endocrinology & Metabolism (publishedVersion)
- PubMed (publishedVersion)
- Data Archiving and Networked Services (DANS) (submittedVersion)
- EUR Research Repository (Erasmus University Rotterdam) (submittedVersion)
- Pure Amsterdam UMC (submittedVersion)
- Topics
- Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Thyroid Disorders and Treatments
- Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Thyroid Cancer Diagnosis and Treatment
- Health Sciences › Medicine › Surgery › Thyroid and Parathyroid Surgery
- Keywords
- bexarotene, hypothyroidism, thyroid hormone metabolism, reverse T3, T3/T4 ratio, thyroid hormone binding, retinoid X receptor agonist, differentiated thyroid cancer, lung metastasis, recombinant human TSH
- MeSH terms
- Bexarotene, Aged, Drug Evaluation, Preclinical, Female, Humans, Hypothyroidism, Lung Neoplasms, Male, Middle Aged, Tetrahydronaphthalenes, Thyroid Hormones, Thyroid Neoplasms, Thyrotropin, Thyroxine, Triiodothyronine, Anticarcinogenic Agents, Retinoid X Receptors
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