Hydrogen sulfide increases glutathione biosynthesis, and glucose uptake and utilisation in C 2 C 12 mouse myotubes.

Diabetic patients have lower blood concentrations of hydrogen sulfide (H2 S), L-cysteine (LC), and glutathione (GSH). Using C2 C12 mouse myotubes as a model, this study investigates the hypothesis that the beneficial effects of LC supplementation are mediated by upregulation of the H2 S status under diabetic conditions. Results show that exogenous administration of sodium hydrosulfide (NaHS, 10 or 20 µM; 6 hours), a H2 S donor, significantly (p < .05) upregulates the gene expression of cystathionine-γ-lyase (CSE), LC transporter (Slc7a11/xCT), and the genes involved in GSH biosynthesis. Additionally, it reduces homocysteine (HCys), reactive oxygen species (ROS) production, and enhances cellular LC, H2 S, and glucose uptake and utilisation in myoblasts. The use of CSE siRNA to induce deficient endogenous H2 S production causes an increase in H2 O2 , ROS, HCys levels, and downregulation of GSH biosynthesis pathway enzymes. In additional, CSE knockdown downregulates glucose transporter type 4 (GLUT4) and gene expression of its key transcription factors, and reduces glucose uptake in C2 C12 myotubes. CSE knockdown cells showed specific increases in the protein S-glutathionylation of LC transporter and GLUT4 along with increased total protein S-glutathionylation. Taken together, evidence from this study provides molecular insights into the importance of the CSE/H2 S system in maintaining the cellular glutathione and glucose homeostasis in C2 C12 myotubes.