Queiroz 2021 Mol Metab

From Bioblast
Publications in the MiPMap
Queiroz AL, Lessard SJ, Ouchida AT, Araujo HN, Goncalves DA, Simoes Froes Guimaraes DSP, Teodoro BG, So K, Espreafico EM, Hirshman MF, Alberici LC, Kettelhut IDC, Goodyear LJ, Silveira LR (2021) The MicroRNA miR-696 is regulated by SNARK and reduces mitochondrial activity in mouse skeletal muscle through Pgc1Ξ± inhibition. Mol Metab 51:101226.

Β» PMID: 33812060 Open Access

Queiroz Andre L, Lessard Sarah J, Ouchida Amanda T, Araujo Hygor N, Goncalves Dawit A, Simoes Froes Guimaraes Dimitrius Santiago P, Teodoro Bruno G, So Kawai, Espreafico Enilza M, Hirshman Michael F, Alberici Luciane C, Kettelhut Isis do Carmo, Goodyear Laurie J, Silveira Leonardo R (2021) Mol Metab

Abstract: MicroRNAs (miRNA) are known to regulate the expression of genes involved in several physiological processes including metabolism, mitochondrial biogenesis, proliferation, differentiation, and cell death.

Using in silico analyses, we identified 219 unique miRNAs that potentially bind to the 3'UTR region of a critical mitochondrial regulator, the peroxisome proliferator-activated receptor gamma coactivator (PGC) 1 alpha (Pgc1Ξ±). Of the 219 candidate miRNAs, miR-696 had one of the highest interactions at the 3'UTR of Pgc1Ξ±, suggesting that miR-696 may be involved in the regulation of Pgc1Ξ±.

Consistent with this hypothesis, we found that miR-696 was highly expressed in the skeletal muscle of STZ-induced diabetic mice and chronic high-fat-fed mice. C2C12 muscle cells exposed to palmitic acid also exhibited a higher expression of miR-696. This increased expression corresponded with a reduced expression of oxidative metabolism genes and reduced mitochondrial respiration. Importantly, reducing miR-696 reversed decreases in mitochondrial activity in response to palmitic acid. Using C2C12 cells treated with the AMP-activated protein kinase (AMPK) activator AICAR and skeletal muscle from AMPKΞ±2 dominant-negative (DN) mice, we found that the signaling mechanism regulating miR-696 did not involve AMPK. In contrast, overexpression of SNF1-AMPK-related kinase (SNARK) in C2C12 cells increased miR-696 transcription while knockdown of SNARK significantly decreased miR-696. Moreover, muscle-specific transgenic mice overexpressing SNARK exhibited a lower expression of Pgc1Ξ±, elevated levels of miR-696, and reduced amounts of spontaneous activity.

Our findings demonstrate that metabolic stress increases miR-696 expression in skeletal muscle cells, which in turn inhibits Pgc1Ξ±, reducing mitochondrial function. SNARK plays a role in this process as a metabolic stress signaling molecule inducing the expression of miR-696. β€’ Keywords: Mitochondrial function, Pgc1Ξ±, SNARK, Skeletal muscle, miR-696 β€’ Bioblast editor: Reiswig R

Labels: MiParea: Respiration, nDNA;cell genetics  Pathology: Diabetes 

Organism: Mouse  Tissue;cell: Skeletal muscle  Preparation: Intact cells 

Regulation: Fatty acid  Coupling state: LEAK, ET 

HRR: Oxygraph-2k 


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