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distribution have been observed between humans and rodents ( Bernal et al . 2015 ). After being transported into the cell, TH is metabolized by the iodothyronine deiodinases. This a family of enzymes that remove an iodine atom from the phenolic or tyrosyl
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iodothyronine deiodinases (Ds). Indeed, iodothyronine deiodination is the essential first step in the pre-receptor control mechanism of TH action ( Nobel et al . 2001 ). From an evolutionary perspective, Ds may be considered pivotal players in the emergence and
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1, type 2 and type 3 iodothyronine deiodinase (D1, D2 and D3). Two of these enzyme types are selective: D2 only catalyses outer ring deiodination (ORD) while D3 only catalyses inner ring deiodination (IRD). The D1 enzyme is non-selective and
Type 1 iodothyronine deiodinase in human physiology and disease
Deiodinases: the balance of thyroid hormone
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3 ). In euthyroid individuals, the conversion of peripheral T 4 to T 3 accounts for 80% of all the T 3 produced. This critical step in thyroid hormone metabolism is catalyzed by two enzymes, the type 1 and type 2 iodothyronine deiodinases (D1 and
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Introduction Homeostasis of thyroid hormone (TH) status is regulated by systemic control of TH release from the thyroid and by local enzymatic activation and inactivation of TH in extrathyroidal tissues that is catalyzed by iodothyronine deiodinase
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decrease precede the decrease in circulating TH levels ( Fekete et al . 2005 ). A striking observation that has been linked to the illness induced TRH decrease is a marked increase in type 2 deiodinase (D2/ Dio2 ) mRNA expression both in tanycytes
INSERM UMR 788, INSERM UMR 854, University Paris-Sud 11, Stéroïdes, neuroprotection et neurogénération, 94275 Le Kremlin-Bicêtre cedex, France
INSERM UMR 788, INSERM UMR 854, University Paris-Sud 11, Stéroïdes, neuroprotection et neurogénération, 94275 Le Kremlin-Bicêtre cedex, France
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INSERM UMR 788, INSERM UMR 854, University Paris-Sud 11, Stéroïdes, neuroprotection et neurogénération, 94275 Le Kremlin-Bicêtre cedex, France
INSERM UMR 788, INSERM UMR 854, University Paris-Sud 11, Stéroïdes, neuroprotection et neurogénération, 94275 Le Kremlin-Bicêtre cedex, France
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INSERM UMR 788, INSERM UMR 854, University Paris-Sud 11, Stéroïdes, neuroprotection et neurogénération, 94275 Le Kremlin-Bicêtre cedex, France
INSERM UMR 788, INSERM UMR 854, University Paris-Sud 11, Stéroïdes, neuroprotection et neurogénération, 94275 Le Kremlin-Bicêtre cedex, France
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INSERM UMR 788, INSERM UMR 854, University Paris-Sud 11, Stéroïdes, neuroprotection et neurogénération, 94275 Le Kremlin-Bicêtre cedex, France
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Introduction Type 2 iodothyronine deiodinase (D2) catalyzes the 5′-deiodination of thyroxine (T 4 ) into the active form of thyroid hormones, 3,5,3′-triiodothyronine (T 3 ; Bianco et al . 2002 , Gereben et al . 2008 ). Notably, in the brain most
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remains unchanged or even decreases. Furthermore, the expression of deiodinating enzymes changes in various tissues ( Wiersinga 2005 ). Deiodinase type 2 (D2; listed as Dio2 in MGI Database) is one of the three known deiodinases. It converts the
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Introduction The iodothyronine deiodinases are selenoenzymes that modulate tri-iodothyronine (T 3 ) concentrations by catalyzing both its production and degradation ( Bianco et al . 2002 , Gereben et al . 2008 ). Thyroxine (T 4 ) is activated via
Local control of thyroid hormone action: role of type 2 deiodinase
Deiodinases: the balance of thyroid hormone
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3 is catalyzed by the type 2 iodothyronine deiodinase enzyme (DIO2), while the type 3 enzyme (DIO3) prevents activation of T 4 and inactivates T 3 . This pre-receptor control of ligand availability to TRs in target cells is a crucial mechanism that