Hydrogen peroxide induces lysosomal protease alterations in PC12 cells

Area of Science:

• Biochemistry
• Cell Biology
• Neuroscience

Background:

• Lysosomal proteases are implicated in neurodegenerative diseases.
• Oxidative stress is a known contributor to cellular damage and disease progression.

Purpose of the Study:

• To investigate the role of specific proteases in hydrogen peroxide (H2O2)-induced cell death in PC12 cells.
• To explore potential therapeutic targets for mitigating oxidative stress-related cell death.

Main Methods:

• PC12 cells were exposed to varying concentrations of H2O2.
• Levels of cystatin C (CYSC), cathepsin B (CATB), cathepsin D (CATD), and caspase-3 were measured.
• Inhibitors for CATD (pepstatin A) and caspase-3 were used to assess their impact on cell viability.

Main Results:

• H2O2 exposure caused a dose-dependent decrease in PC12 cell viability.
• H2O2 altered the expression and activity of CYSC, CATB, CATD, and caspase-3.
• Inhibition of CATD and caspase-3 significantly improved cell viability following H2O2 exposure.
• Caspase-3-like activity, indicated by PARP cleavage, was observed after H2O2 treatment.

Conclusions:

• H2O2-induced cell death in PC12 cells is mediated, in part, by caspase-3 and CATD.
• Cysteine protease suppression enhances CATD expression and activity.
• These findings highlight potential therapeutic strategies targeting lysosomal proteases and caspase-3 in oxidative stress-related conditions.