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2014 ; 94
(2
): 355-82
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Thyroid hormone regulation of metabolism
#MMPMID24692351
Mullur R
; Liu YY
; Brent GA
Physiol Rev
2014[Apr]; 94
(2
): 355-82
PMID24692351
show ga
Thyroid hormone (TH) is required for normal development as well as regulating
metabolism in the adult. The thyroid hormone receptor (TR) isoforms, ? and ?, are
differentially expressed in tissues and have distinct roles in TH signaling.
Local activation of thyroxine (T4), to the active form, triiodothyronine (T3), by
5'-deiodinase type 2 (D2) is a key mechanism of TH regulation of metabolism. D2
is expressed in the hypothalamus, white fat, brown adipose tissue (BAT), and
skeletal muscle and is required for adaptive thermogenesis. The thyroid gland is
regulated by thyrotropin releasing hormone (TRH) and thyroid stimulating hormone
(TSH). In addition to TRH/TSH regulation by TH feedback, there is central
modulation by nutritional signals, such as leptin, as well as peptides regulating
appetite. The nutrient status of the cell provides feedback on TH signaling
pathways through epigentic modification of histones. Integration of TH signaling
with the adrenergic nervous system occurs peripherally, in liver, white fat, and
BAT, but also centrally, in the hypothalamus. TR regulates cholesterol and
carbohydrate metabolism through direct actions on gene expression as well as
cross-talk with other nuclear receptors, including peroxisome
proliferator-activated receptor (PPAR), liver X receptor (LXR), and bile acid
signaling pathways. TH modulates hepatic insulin sensitivity, especially
important for the suppression of hepatic gluconeogenesis. The role of TH in
regulating metabolic pathways has led to several new therapeutic targets for
metabolic disorders. Understanding the mechanisms and interactions of the various
TH signaling pathways in metabolism will improve our likelihood of identifying
effective and selective targets.