The role of thyroid hormone calorigenesis in the redox regulation of gene expression
Biol. Res
;
39(4): 611-617, 2006. ilus
Article
in English
| LILACS
| ID: lil-456596
ABSTRACT
Thyroid hormone (TH; 3,3',5-triiodothyronine, T3) is required for the normal function of most tissues, with major effects on 0(2) consumption and metabolic rate. These are due to transcriptional activation of respiratory genes through the interaction of T3-liganded TH receptors with TH response elements or the activation of intermediate factors, with the consequent higher production of reactive 0(2) species (ROS) and antioxidant depletion. T3-induced oxidative stress in the liver triggers the redox upregulation of the expression of cytokines (tumor necrosis factor-alfa [TNF-alfa], interleukin-10), enzymes (inducible nitric oxide synthase, manganese superoxide dismutase), and anti-apoptotic proteins (Bcl-2), via a cascade initiated by TNF-alfa produced by Kupffer cells, involving inhibitor of kB phosphorylation and nuclear factor-kB activation. Thus, TH calorigenesis triggers an expression pattern that may represent an adaptive mechanism to re-establish redox homeostasis and promote cell survival under conditions of ROS toxicity secondary to TH-induced oxidative stress. Mechanisms of expression of respiratory and redox-sensitive genes may be functionally integrated, which could be of importance to understand the complexities of TH action and the outcome of thyroid gland dysfunction.
Full text:
Available
Index:
LILACS (Americas)
Main subject:
Triiodothyronine
/
Cytokines
/
Oxidative Stress
/
Energy Metabolism
Limits:
Animals
/
Humans
Language:
English
Journal:
Biol. Res
Journal subject:
Biology
Year:
2006
Type:
Article
/
Project document
Affiliation country:
Chile
Institution/Affiliation country:
University of Chile/CL
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