miR-24-mediated knockdown of H2AX damages mitochondria and the insulin signaling pathway.
- Author:
Jae Hoon JEONG
1
;
Young CHEOL KANG
;
Ying PIAO
;
Sora KANG
;
Youngmi Kim PAK
Author Information
- Publication Type:Original Article
- MeSH: Adenosine Triphosphate; Animals; Insulin Resistance; Insulin*; Membrane Potentials; Mice; MicroRNAs; Mitochondria*; Oxygen Consumption; Phosphorylation; RNA; Transcription Factors
- From:Experimental & Molecular Medicine 2017;49(4):e313-
- CountryRepublic of Korea
- Language:English
- Abstract: Mitochondrial deficits or altered expressions of microRNAs are associated with the pathogenesis of various diseases, and microRNA-operated control of mitochondrial activity has been reported. Using a retrovirus-mediated short-hairpin RNA (shRNA) system, we observed that miR-24-mediated H2AX knockdown (H2AX-KD) impaired both mitochondria and the insulin signaling pathway. The overexpression of miR-24 decreased mitochondrial H2AX and disrupted mitochondrial function, as indicated by the ATP content, membrane potential and oxygen consumption. Similar mitochondrial damage was observed in shH2AX-mediated specific H2AX-KD cells. The H2AX-KD reduced the expression levels of mitochondrial transcription factor A (TFAM) and mitochondrial DNA-dependent transcripts. H2AX-KD mitochondria were swollen, and their cristae were destroyed. H2AX-KD also blocked the import of precursor proteins into mitochondria and the insulin-stimulated phosphorylation of IRS-1 (Y632) and Akt (S473 and T308). The rescue of H2AX, but not the nuclear form of ΔC24-H2AX, restored all features of miR-24- or shH2AX-mediated impairment of mitochondria. Hepatic miR-24 levels were significantly increased in db/db and ob/ob mice. A strong feedback loop may be present among miR-24, H2AX, mitochondria and the insulin signaling pathway. Our findings suggest that H2AX-targeting miR-24 may be a novel negative regulator of mitochondrial function and is implicated in the pathogenesis of insulin resistance.
