Sparc, an EPS-induced gene, modulates the extracellular matrix and mitochondrial function via ILK/AMPK pathways in C2C12 cells

• Published in: Life sciences (1973) Vol. 229; pp. 277 - 287
• Main Authors: Melouane, Aicha, Yoshioka, Mayumi, Kanzaki, Makoto, St-Amand, Jonny
• Format: Journal Article
• Language: English
• Published: Netherlands Elsevier Inc 15.07.2019; Elsevier BV
• Subjects: Activation; Adenosine kinase; Adenosine monophosphate; AMP; AMP-Activated Protein Kinases - genetics; AMP-Activated Protein Kinases - metabolism; Animals; Antibodies; Cells, Cultured; Collagen; Electric Stimulation; Electrical pulse stimulation; Extracellular matrix; Extracellular Matrix - metabolism; Gene expression; Gene Expression Regulation; Genes; Glucose; Glycogen; Glycogen synthase kinase 3; ILK protein; Inhibition; Kinases; Mice; Mitochondria; Mitochondria - genetics; Mitochondria - metabolism; Mitochondrial Proteins - genetics; Mitochondrial Proteins - metabolism; Modulation; Muscle; Muscles; Myoblasts; Myoblasts - cytology; Myoblasts - metabolism; Myotubes; Osteonectin; Osteonectin - genetics; Osteonectin - metabolism; Peroxisome Proliferator-Activated Receptor Gamma Coactivator 1-alpha - genetics; Peroxisome Proliferator-Activated Receptor Gamma Coactivator 1-alpha - metabolism; Phosphorylation; Protein kinase; Protein-Serine-Threonine Kinases - genetics; Protein-Serine-Threonine Kinases - metabolism; Proteins; SPARC; Succinate dehydrogenase; RT; SPARC; DM; EPS; ILK; OXPHOS; 36B4; DLW; DMEM; Electrical pulse stimulation; Mitochondria; p-AMPK; FBS; Extracellular matrix; Muscle; Pgc1α; PBS; TBS; GM; GSK-3ß; Q-RT-PCR; PVDF; SDHB; ECM; p-GSK-3ß; CS; SDS-PAGE; PC; MEM; AMPK; anti-SPARC; AICAR; rSPARC; GAPDH; DLF
• ISSN: 0024-3205; 1879-0631
• DOI: 10.1016/j.lfs.2019.05.070

Secreted protein acidic and rich in cysteine, (SPARC), is a matricellular protein implicated in the modulation of the extracellular matrix (ECM) and mitochondrial proteins expression. To study the mechanism through which SPARC is involved in the possible link between ECM and mitochondria, C2C12 myoblasts were cultured with/without the exogenous addition/inhibition of SPARC as well as activation/inhibition of adenosine monophosphate-activated protein kinase (AMPK). Electrical pulse stimulation (EPS), was applied for 2 days in myotubes. The expressions of ECM-related (integrin-linked kinase (ILK), glycogen synthase kinase-3 beta (GSK-3ß), phosphorylated-GSK-3ß (p-GSK-3ß) and collagen 1a1), mitochondrial-related (AMPK, phosphorylated-AMPK (p-AMPK), succinate dehydrogenase (SDHB) and peroxisome proliferator-activated receptor gamma coactivator 1-alpha (Pgc1α)) and SPARC proteins and/or genes were measured after modulation of SPARC and/or AMPK as well as with or without EPS. The addition of SPARC in C2C12 myoblast increased the expression of ILK, p-GSK-3ß and p-AMPK whereas anti-SPARC antibody decreased them at different incubation times (0, 10, and 30 min, and 6 h). The AMPK activation increased SPARC, collagen 1a1, p-AMPK and SDHB proteins level, however, AMPK inhibition blunted the effects. EPS induced Sparc and Pgc1a genes expression. Sparc, an EPS-induced gene, may be involved in the link between ECM remodeling and mitochondrial function in muscle via its interaction with ILK/AMPK.