Melatonin improves mitochondrial function and redox balance in human cartilage endplate-derived stem cells

Area of Science:

• Stem cell biology
• Mitochondrial medicine
• Regenerative medicine

Background:

• Mitochondrial oxidative stress impacts stem cell function in degenerative conditions.
• Cartilage endplate-derived stem cells (CESCs) are crucial for intervertebral disc homeostasis.
• The mitochondrial redox status of CESCs during degeneration is not fully understood.

Purpose of the Study:

• To investigate mitochondrial oxidative stress in human CESCs from degenerated intervertebral discs.
• To evaluate the effects of melatonin on mitochondrial function in CESCs.
• To explore the role of SIRT3 in melatonin-mediated mitochondrial protection.

Main Methods:

• Human CESCs from varying degeneration degrees were used as an in vitro model.
• Mitochondrial oxidative stress markers (ROS, superoxide), membrane potential, ATP production, and antioxidant enzyme activities were measured.
• SIRT3 expression was analyzed, and its role was investigated using siRNA-mediated knockdown.
• Mitochondrial ultrastructure was assessed.

Main Results:

• CESCs from advanced degeneration showed increased oxidative stress, reduced mitochondrial function, and ultrastructural damage.
• Melatonin treatment decreased oxidative stress and improved mitochondrial function in CESCs.
• SIRT3 knockdown partially reversed melatonin's protective effects, indicating SIRT3's involvement.

Conclusions:

• Melatonin ameliorates mitochondrial oxidative stress and enhances mitochondrial function in human CESCs.
• SIRT3 is implicated in the mechanism by which melatonin exerts its protective effects on CESC mitochondria.
• These findings support melatonin as a potential therapeutic agent for modulating mitochondrial oxidative stress in degenerative diseases.