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2015 ; 10
(4
): e0122987
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English Wikipedia
The amelioration of hepatic steatosis by thyroid hormone receptor agonists is
insufficient to restore insulin sensitivity in ob/ob mice
#MMPMID25849936
Martagón AJ
; Lin JZ
; Cimini SL
; Webb P
; Phillips KJ
PLoS One
2015[]; 10
(4
): e0122987
PMID25849936
show ga
Thyroid hormone receptor (TR) agonists have been proposed as therapeutic agents
to treat non-alcoholic fatty liver disease (NAFLD) and insulin resistance. We
investigated the ability of the TR agonists GC-1 and KB2115 to reduce hepatic
steatosis in ob/ob mice. Both compounds markedly reduced hepatic triglyceride
levels and ameliorated hepatic steatosis. However, the amelioration of fatty
liver was not sufficient to improve insulin sensitivity in these mice and
reductions in hepatic triglycerides did not correlate with improvements in
insulin sensitivity or glycemic control. Instead, the effects of TR activation on
glycemia varied widely and were found to depend upon the time of treatment as
well as the compound and dosage used. Lower doses of GC-1 were found to further
impair glycemic control, while a higher dose of the same compound resulted in
substantially improved glucose tolerance and insulin sensitivity, despite all
doses being equally effective at reducing hepatic triglyceride levels.
Improvements in glycemic control and insulin sensitivity were observed only in
treatments that also increased body temperature, suggesting that the induction of
thermogenesis may play a role in mediating these beneficial effects. These data
illustrate that the relationship between TR activation and insulin sensitivity is
complex and suggests that although TR agonists may have value in treating NAFLD,
their effect on insulin sensitivity must also be considered.