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[ 22 ]. Here, we will summarize the consequences of Mct8 deficiency in humans and mice with a special focus on the hypothalamus-pituitary-thyroid axis. Phenotype of MCT8 Patients The physiological significance of Mct8 as a transporter critical
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-stimulating hormone levels paved the way to the discovery of underlying mutations in MCT8 in these patients [ 2 , 3 ]. Mouse models for Mct8 deficiency have been generated and replicate the endocrine phenotype seen in humans [ 4 , 5 , 6 ]. Low circulating T 4 and
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mouse model that displays neurodevelopmental features of MCT8 deficiency [ 13 ]. The brain phenotype of these mice could be rescued by administration of the T 3 metabolite 3,3′,5-triiodothyroacetic acid (Triac) [ 14 ]. Triac is a T 3 receptor agonist
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regulate the expression of different target genes. This is the pathway by which TH mediates most of its actions ( 2 ). The Allan–Herndon–Dudley syndrome (AHDS), or MCT8 deficiency, is a rare X-linked disease caused by inactivating mutations in the SLC16A
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progressed significantly within only one decade. Physiological Effects of TH Transporter Deficiency Patients carrying mutations in MCT8 exhibit high T 3 , low/normal T 4 , and normal TSH levels [ 9 , 10 ]. Mice deficient in Mct8 display the same
Department of Medical Biotechnology and Translational Medicine, University of Milan, Milano, Italy
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Endocrine Section, Beacon Hospital, Dublin, Ireland.
School of Medicine, University College Dublin, Ireland
Endocrinology Department, St Vincent’s University Hospital, Dublin, Ireland
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), resistance to thyroid hormone α (RTHα), monocarboxylate transporter 8 (MCT8) defects, selenoprotein deficiency, and iodothyronine deiodinase 1 defects. Methodology and grading of evidence Following consultation with its Guidelines Board, the Executive
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-specific alterations in thyroid hormone homeostasis in combined Mct10 and Mct8 deficiency. Endocrinology 2014;155:315-325. 17 Friesema EC, Docter R, Moerings EP, Stieger B, Hagenbuch B, Meier PJ, Krenning EP, Hennemann G, Visser TJ: Identification of thyroid
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-91] provide evidence that the characteristic serum TH profile in Mct8-deficiency is not caused by increased hepatic conversion through the type I-deiodinase selenoprotein enzyme. Astonishingly, Mct8-deficient mice show a much weaker neurological phenotype
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Departments of Scuola Superiore Sant'Anna, Pisa, Italy
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accurate index of the functional state. Discrepancy between plasma and tissue TH homeostasis has been reported in rare genetic diseases such as MCT8 deficiency [ 8 ]. It has also been suggested to occur in common clinical conditions such as heart failure
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Müller J, Mayerl S, Visser TJ, Darras VM, Boelen A, Frappart L, et al: Tissue-specific alterations in thyroid hormone homeostasis in combined Mct10 and Mct8 deficiency. Endocrinology 2014;155: 315–325. 10.1007/s11745-017-4243-4 28315997 21 Escobar