Insulin involved Akt/ERK and Bcl-2/Bax pathways against oxidative damages in C6 glial cells

Area of Science:

• Neuroscience
• Cell Biology
• Biochemistry

Background:

• Insulin, a key metabolic regulator, also plays crucial roles in brain function.
• Hydrogen peroxide (H2O2) induces oxidative stress and cellular damage in glial cells, impacting neuronal health.
• Understanding insulin's protective mechanisms against oxidative stress in glial cells is vital for neuroprotection.

Purpose of the Study:

• To elucidate the protective mechanisms of insulin against H2O2-induced toxicity in C6 glial cells.
• To investigate insulin's effects on oxidative stress markers, cell viability, and apoptosis.
• To identify the signaling pathways modulated by insulin during oxidative stress.

Main Methods:

• C6 glial cells were exposed to H2O2 with or without insulin treatment.
• Assessed cytotoxicity, lactate dehydrogenase, nitric oxide, reactive oxygen species (ROS), and calcium ion levels.
• Measured lipid peroxidation, protein oxidation, glutathione levels, and key signaling proteins via Western blotting and RT-PCR.

Main Results:

• Insulin significantly reduced H2O2-induced cell death and membrane damage.
• Insulin attenuated intracellular ROS generation, calcium ion influx, and apoptosis.
• Insulin normalized glutathione levels and modulated signaling pathways, including Akt, ERK1/2, Bcl-2, and Bax.

Conclusions:

• Insulin demonstrates significant neuroprotective effects against H2O2-induced toxicity in C6 glial cells.
• Insulin mitigates oxidative stress and apoptosis by interfering with ROS production and modulating cell survival pathways.
• These findings suggest insulin's therapeutic potential in conditions involving glial cell oxidative damage.