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2018 ; 8
(8
): 2171-2188
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Adipocyte-Derived Exosomal MiR-27a Induces Insulin Resistance in Skeletal Muscle
Through Repression of PPAR?
#MMPMID29721071
Yu Y
; Du H
; Wei S
; Feng L
; Li J
; Yao F
; Zhang M
; Hatch GM
; Chen L
Theranostics
2018[]; 8
(8
): 2171-2188
PMID29721071
show ga
The mechanism by which adipocyte-derived endocrine factors promote insulin
resistance in skeletal muscle are not fully understood. MiR-27a is highly
expressed in sera of obese individuals with prediabetes and T2DM, and mainly
derived by adipose tissues. Thus, miR-27a secreted into circulation by adipose
tissue may regulate insulin resistance in skeletal muscle. Methods: The
association between miR-27a and insulin resistance in skeletal muscle was
determined in obese children, high-fat diet-induced miR-27a knockdown obese mice,
db/db mice and C2C12 cells overexpressing miR-27a. The crosstalk mediated by
exosomal miR-27a between adipose tissue and skeletal muscle was determined in
C2C12 cells incubated with conditioned medium prepared from palmitate-treated
3T3-L1 adipocytes. Results: We showed that serum miR-27a level correlated
positively with obesity and insulin resistance in obese children, and that
elevated serum miR-27a levels correlated with insulin resistance in leptin
receptor-deficient db/db mice, and with obesity and insulin resistance in
high-fat diet-fed C57BL/6J mice. MiR-27a released from adipocytes of high-fat
diet-fed C57BL/6J mice was associated with triglyceride accumulation. MiR-27a
derived from these adipocytes induced insulin resistance in C2C12 skeletal muscle
cells through miR-27a-mediated repression of PPAR? and its downstream genes
involved in the development of obesity. Conclusions: These results identify a
novel crosstalk signaling pathway between adipose tissue and skeletal muscle in
the development of insulin resistance, and indicate that adipose tissue-derived
miR-27a may play a key role in the development of obesity-triggered insulin
resistance in skeletal muscle.