Shanghai Journal of Stomatology ›› 2026, Vol. 35 ›› Issue (1): 19-28.doi: 10.19439/j.sjos.2026.01.004

• Original Articles • Previous Articles     Next Articles

Myogenic induction activity and mechanism of rhein in aged mouse myoblasts C2C12 cell line

Pan Cancan, Qi Lei, Si Jiawen, Shen Guofang   

  1. Department of Oral and Craniomaxillofacial Surgery, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine; College of Stomatology, Shanghai Jiao Tong University; National Clinical Research Center for Oral Diseases; Shanghai Key Laboratory of Stomatology; Shanghai Research Institute of Stomatology. Shanghai 200011, China
  • Received:2024-08-23 Revised:2024-10-09 Online:2026-03-12 Published:2026-03-12

Abstract: PURPOSE: To establish an in vitro model of aged murine myogenic cell line C2C12, clarify rhein's anti-inflammatory function, and explore its effects on myogenic induction activity and related immunomodulatory mechanisms in aged C2C12 cells. METHODS: CCK-8 assay was used to assess cell proliferation rates of C2C12 cells pretreated with different concentrations of hydrogen peroxide(H2O2) for varying duration. Real-time quantitative reverse transcription PCR (RT-qPCR) was employed to observe myogenic and aged-related gene expression changes. The expression of reactive oxygen species(ROS) and senescence-associated β-galactosidase (SA-β-gal) was measured. Immunofluorescence was used to compare the diameter of the formed myotubes. The effects of different concentrations of rhein(0, 1, 2, 4, 8, 16, 32 μmol/L) on the proliferation of murine macrophage cell line RAW264.7 over 3 days were measured using CCK-8 assay. The expression of polarization-related factors in RAW264.7 cells was detected by RT-qPCR and immunofluorescence. The effects of macrophage-conditioned medium(CM) induced by rhein on myogenic function and age-related phenotypes in aged C2C12 cells were explored through experiments including RT-qPCR to detect relevant gene expression, ROS and SA-β-gal staining, and immunofluorescence staining. RESULTS: Compared with the control group, treatment of C2C12 cells with 200 and 400 μmol/L H2O2 for 24 hours significantly reduced the proliferation ability of C2C12 without causing apoptosis, increased the expression of age-related genes, ROS, and SA-β-gal, decreased the expression of myogenic genes, and inhibited myotube formation, with more pronounced effects at 400 μmol/L(P<0.05). Rhein at a concentration of 1 μmol/L was non-cytotoxic to RAW264.7 cells, reduced the expression of M1-related phenotypes (TNF-α, IL-1β, iNOS, IL-6), and promoted the expression of M2-related phenotypes (IL-1Ra, CD206)(P<0.05). Macrophage-conditioned medium (CM) induced by rhein enhanced the expression of myogenic genes in aged C2C12 cells, increased the diameter of myotube, and reduced the expression of age-related genes, ROS, and SA-β-gal(P<0.05). CONCLUSIONS: An in vitro model of aged muscle stem cells can be established using H2O2. Rhein can enhance the myogenic capacity of aged muscle, likely through the regulation of macrophage M2 polarization.

Key words: Rhein, Aged, Skeletal muscle regeneration, Macrophages, M1/M2 polarization

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