Sirt1 mitigates HT-2 toxin-induced chondrocyte injury potentially via the Wnt/β-catenin signaling pathway

Area of Science:

• Biochemistry
• Cell Biology
• Toxicology

Background:

• Sirtuin 1 (Sirt1) is vital for cartilage health.
• Dysregulation of Sirt1 is linked to Kashin-Beck disease (KBD), a bone and cartilage disorder.
• KBD is associated with exposure to the HT-2 toxin.

Purpose of the Study:

• To investigate the role of Sirt1 in HT-2 toxin-induced chondrocyte injury.
• To explore the underlying molecular mechanisms of HT-2 toxin's effects on chondrocytes.
• To evaluate the therapeutic potential of Sirt1 activation in mitigating chondrocyte damage.

Main Methods:

• Human fetal chondrocytes were exposed to varying concentrations of HT-2 toxin.
• Cell viability, extracellular matrix (ECM) degradation markers, and senescence indicators were assessed.
• The impact of resveratrol, a Sirt1 agonist, on HT-2 toxin-treated chondrocytes was evaluated.
• Changes in Sirt1 expression and Wnt/β-catenin signaling pathway activation were analyzed.

Main Results:

• HT-2 toxin reduced chondrocyte viability and degraded ECM components (Collagen II, TIMP1), while increasing MMP13.
• The toxin induced chondrocyte senescence, evidenced by increased P21 and β-galactosidase activity.
• HT-2 toxin suppressed Sirt1 expression and activated the Wnt/β-catenin signaling pathway.
• Resveratrol treatment partially restored ECM integrity, reduced senescence markers, and inhibited Wnt/β-catenin signaling, but did not affect MMP13 levels.

Conclusions:

• Sirt1 activation mitigates HT-2 toxin-induced chondrocyte damage.
• Sirt1 exerts its protective effects by inhibiting the Wnt/β-catenin signaling pathway.
• Targeting Sirt1 may represent a therapeutic approach for KBD and related osteochondropathies.