Ari J Wassner1, Rebecca H Jugo1, David M Dorfman2, Robert F Padera2, Michelle A Maynard1, Ann M Zavacki3, Patrick Y Jay4, Stephen A Huang1. 1. 1 Thyroid Program, Division of Endocrinology, Boston Children's Hospital , Boston, Massachusetts. 2. 2 Department of Pathology, Brigham and Women's Hospital , Boston, Massachusetts. 3. 3 Thyroid Section, Division of Endocrinology, Diabetes, and Hypertension, Brigham and Women's Hospital , Boston, Massachusetts. 4. 4 Departments of Pediatrics and Genetics, Washington University School of Medicine , St. Louis, Missouri.
Abstract
BACKGROUND: The thyroid hormone-inactivating enzyme type 3 deiodinase (D3) is induced during hypertrophic and ischemic cardiomyopathy, leading to a state of local cardiac hypothyroidism. Whether D3 induction occurs in dilated cardiomyopathy is unknown. METHODS: This study characterized changes in cardiac D3 and thyroid hormone signaling in a transgenic model of progressive dilated cardiomyopathy (TG9 mice). RESULTS: Cardiac D3 was dramatically induced 15-fold during the progression of dilated cardiomyopathy in TG9 mice. This D3 induction localized to cardiomyocytes and was associated with a decrease in myocardial thyroid hormone signaling. CONCLUSIONS: Cardiac D3 is induced in a mouse model of dilated cardiomyopathy, indicating that D3 induction may be a general response to diverse forms of cardiomyopathy.
BACKGROUND: The thyroid hormone-inactivating enzyme type 3 deiodinase (D3) is induced during hypertrophic and ischemic cardiomyopathy, leading to a state of local cardiac hypothyroidism. Whether D3 induction occurs in dilated cardiomyopathy is unknown. METHODS: This study characterized changes in cardiac D3 and thyroid hormone signaling in a transgenic model of progressive dilated cardiomyopathy (TG9 mice). RESULTS: Cardiac D3 was dramatically induced 15-fold during the progression of dilated cardiomyopathy in TG9 mice. This D3 induction localized to cardiomyocytes and was associated with a decrease in myocardial thyroid hormone signaling. CONCLUSIONS: Cardiac D3 is induced in a mouse model of dilated cardiomyopathy, indicating that D3 induction may be a general response to diverse forms of cardiomyopathy.
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