Object: L6 cells were cultured to explore the possible mechanism underlying the improvement of insulin resistance by Liraglutide (LR). Methods: Cells were divided into 5 groups—control, high-fat, 10 nmol/L LR + 0.6 mmol/L palmitic acid (PA) (10LR), 100 nmol/L LR + 0.6 mmol/L PA (100LR), and 1000 nmol/L LR + 0.6 mmol/L PA (1000LR). CCK-8 method to detect cell viability, GPO-PAP enzymatic method to detect intracellular triglyceride content, and reverse transcription quantitative real-time polymerase chain reaction (RT-qPCR) and western blotting methods to detect fatty acid translocase CD36 (FAT /CD36) and fatty acid binding protein 4 (FABP4) in L6 cells, glucose-regulated protein 78 (GRP78), glucose transporter 4 (GLUT4) expression at the mRNA and protein levels, respectively, were performed. Results: We found that after PA intervention for 24 h, the cell viability decreased significantly; the cell viability of the LR group was higher than that of the high-fat group (P < 0.01). After PA intervention, compared with those in the high-fat group, GRP-78, FAT/CD36, FABP4 mRNA [(4.36 ± 0.32 vs 8.15 ± 0.35); (1.00 ± 0.04 vs 2.46 ± 0.08); (2.88 ± 0.55 vs 8.29 ± 0.52), P < 0.01] and protein [(3338.13 ± 333.15 vs 4963.98 ± 277.29); (1978.85 ± 124.24 vs 2676.07 ± 100.64); (3372.00 ± 219.84 vs 6083.20 ± 284.70), both P < 0.01] expression decreased in the LR group. The expression levels of GLUT4 mRNA [(0.75 ± 0.04 vs 0.34 ± 0.03), P < 0.01] and protein [(3443.71 ± 191.89 vs 2137.79 ± 118.75), P < 0.01] increased. Conclusion: Therefore, we conclude that LR can reverse PA-induced cell inactivation and lipid deposition, which may be related to the change in GRP-78, FAT /CD36, FABP4, GLUT4 and other factors.
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