Curcumin induces concentration-dependent alterations in mitochondrial function through ROS in C2C12 mouse myoblasts

Area of Science:

• Biochemistry
• Cell Biology
• Mitochondrial Research

Background:

• Curcumin's dual role: antioxidant in normal cells, pro-oxidant in tumor cells.
• Mitochondria are key targets and sources of reactive oxygen species (ROS).
• Understanding curcumin's concentration-dependent effects on cellular redox and mitochondria is crucial.

Purpose of the Study:

• To investigate how curcumin concentration influences cellular redox status and mitochondrial function in normal cells.
• To determine curcumin's effects on C2C12 myoblasts under normal and high glucose conditions.
• To elucidate the mechanisms underlying curcumin-induced cell death or protection.

Main Methods:

• Exposure of mouse C2C12 myoblasts to varying curcumin concentrations (1-50 μM).
• Assessment of reactive oxygen species (ROS) levels, cell viability, and mitochondrial function.
• Analysis of mitochondrial permeability transition pore opening, cytochrome c release, and caspase activation.

Main Results:

• High curcumin concentrations (10-50 μM) decreased cell viability and increased ROS, leading to apoptosis.
• Low curcumin concentrations (1-5 μM) increased mitochondrial mass and membrane potential without affecting viability.
• Low-dose curcumin (5 μM) protected cells against high glucose-induced oxidative injury.

Conclusions:

• Curcumin's effect on mitochondria is concentration-dependent, leading to either cell protection or death.
• Low-dose curcumin shows therapeutic potential for diabetes and mitochondrial diseases by modulating ROS.
• Curcumin's differential impact on cellular redox status offers a potential therapeutic strategy.