Involvement of leptin receptor long isoform (LepRb)-STAT3 signaling pathway in brain fat mass- and obesity-associated (FTO) downregulation during energy restriction.
Obesity is an important risk factor for cardiovascular disease, diabetes and certain cancers. The fat mass- and obesity-associated (FTO) gene is tightly associated with the pathophysiology of obesity, whereas the exact role of FTO remains poorly understood. Here, we investigated the alternations of FTO mRNA and protein expression in the peripheral metabolic tissues and the brain upon energy restriction (ER) and explored the involvement of the leptin signaling pathway in FTO regulation under ER status. ER decreased the FTO mRNA and protein expression in hypothalamus and brainstem but not in periphery. Using double-immunofluorescence staining, FTO was found to be colocalized with the leptin receptor long isoform (LepRb) in arcuate nucleus of hypothalamus and the nucleus of the solitary tract. In LepRb mutant db/db mice, the FTO downregulation in brain and body weight reduction induced by ER were completely abolished. The enhanced phosphorylation of signal transducer and activator of transcription 3 (STAT3) induced by ER was also impaired in db/db mice. Moreover, leptin directly activated the STAT3 signaling pathway and downregulated FTO in in vitro arcuate nucleus of hypothalamus cultures and in vivo wild-type mice but not db/db mice. Thus, our results provide the first evidence that the LepRb-STAT3 signaling pathway is involved in the brain FTO downregulation during ER.
Department of Pharmacology, Second Military Medical University, Shanghai, China.
Pei
P
Wang
Feng-Jiao
FJ
Yang
Hui
H
Du
Yun-Feng
YF
Guan
Tian-Ying
TY
Xu
Xue-Wen
XW
Xu
Ding-Feng
DF
Su
Chao-Yu
CY
Miao
D000071516:Alpha-Ketoglutarate-Dependent Dioxygenase FTO; D000818:Animals; D015153:Blotting, Western; D001835:Body Weight / Q000235:genetics; D001921:Brain / Q000378:metabolism*; D005455:Fluorescent Antibody Technique; D008297:Male; D051379:Mice; D020033:Protein Isoforms / Q000235:genetics / Q000378:metabolism*; D011506:Proteins / Q000235:genetics / Q000378:metabolism*; D051381:Rats; D054411:Receptors, Leptin / Q000235:genetics / Q000378:metabolism*; D020133:Reverse Transcriptase Polymerase Chain Reaction; D050796:STAT3 Transcription Factor / Q000235:genetics / Q000378:metabolism*; D015398:Signal Transduction / Q000235:genetics / Q000502:physiology
D020033:Protein Isoforms; D011506:Proteins; D054411:Receptors, Leptin; D050796:STAT3 Transcription Factor; D000071516:Alpha-Ketoglutarate-Dependent Dioxygenase FTO; C529321:FTO protein, rat
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