Thyroid hormone (T3) and TRbeta agonist GC-1 inhibit/reverse nonalcoholic fatty liver in rats.
Nonalcoholic fatty liver disease is the most common noninfectious liver disease in clinical practice, and there is an increasing need for new therapeutic approaches for the treatment of this liver disease. Here, we examined the effect of the thyroid hormone triiodothyronine (T3) and the agonist of the thyroid hormone receptor beta isoform (TRbeta), GC-1, on fatty liver and steatohepatitis induced in rodents by a choline-methionine deficient (CMD) diet. Male Fischer 344 rats fed a CMD diet for 1 wk developed a marked fatty liver and mild hepatitis. Concurrent administration of T3 resulted in a complete prevention of the fatty change associated with increased fatty acid mitochondrial and peroxisomal beta-oxidation. To investigate whether T3 could also reverse fully established fatty liver, rats were fed a CMD diet for 10 wk and then cofed T3 for 1 wk. Coadministration of T3 resulted in a complete regression of liver steatosis associated with a decrease of lipid peroxidation, cyclooxygenase-2 expression, and activation of phospho-STAT3 and phospho-SAPK/JNK. Finally, additional experiments showed that GC-1, which has no significant side effects on heart rate, prevented and reverted CMD-induced fat accumulation, and ameliorated steatohepatitis. These results indicate that TR agonists have the potential to inhibit or reverse hepatic steatosis induced by a nutritional model.
Perra
Andrea
A
Department of Toxicology, Oncology and Molecular Pathology Unit, University of Cagliari, Cagliari, Italy.
Simbula
Gabriella
G
Simbula
Michela
M
Pibiri
Monica
M
Kowalik
Marta A
MA
Sulas
Pia
P
Cocco
Maria T
MT
Ledda-Columbano
Giovanna M
GM
Columbano
Amedeo
A
D000085:Acetates / Q000494:pharmacology*; D000818:Animals; D001483:Base Sequence; D017931:DNA Primers / Q000235:genetics; D004032:Diet; D004195:Disease Models, Animal; D005234:Fatty Liver / Q000188:drug therapy* / Q000378:metabolism / Q000473:pathology / Q000517:prevention & control; D015227:Lipid Peroxidation / Q000187:drug effects; D008099:Liver / Q000187:drug effects / Q000378:metabolism / Q000473:pathology; D008297:Male; D010636:Phenols / Q000494:pharmacology*; D051381:Rats; D011916:Rats, Inbred F344; D037042:Thyroid Hormone Receptors beta / Q000819:agonists*; D014280:Triglycerides / Q000378:metabolism; D014284:Triiodothyronine / Q000494:pharmacology*
D000085:Acetates; D017931:DNA Primers; C413355:GC 1 compound; D010636:Phenols; D037042:Thyroid Hormone Receptors beta; D014280:Triglycerides; D014284:Triiodothyronine