Chitooligosaccharides Derivatives Protect ARPE-19 Cells against Acrolein-Induced Oxidative Injury

Area of Science:

• Biochemistry
• Ophthalmology
• Cell Biology

Background:

• Age-related macular degeneration (AMD) is a primary cause of vision loss in older adults.
• Oxidative stress in retinal pigment epithelium (RPE) cells significantly contributes to AMD progression.

Purpose of the Study:

• To investigate the protective effects of chitosan oligosaccharides (COSs) and their N-acetylated derivatives (NACOSs) against oxidative stress in ARPE-19 cells.
• To evaluate the potential of COSs and NACOSs as therapeutic agents for AMD.

Main Methods:

• Preparation of COSs and NACOSs.
• Assessment of cell viability using the MTT assay in an acrolein-induced oxidative stress model.
• Measurement of reactive oxygen species (ROS), mitochondrial membrane potential, glutathione (GSH) levels, and antioxidant enzyme activities (SOD, GSH-Px).
• Analysis of Nrf2 pathway activation.

Main Results:

• COSs and NACOSs demonstrated dose-dependent protective effects against acrolein-induced ARPE-19 cell damage.
• Chitopentaose (COS-5) and its N-acetylated derivative (N-5) exhibited the strongest protective activity.
• COS-5 and N-5 pretreatment reduced ROS production, enhanced mitochondrial function, increased GSH levels, and boosted SOD and GSH-Px activity.
• N-5 treatment upregulated nuclear Nrf2 levels and downstream antioxidant enzyme expression.

Conclusions:

• COSs and NACOSs protect retinal pigment epithelial cells from degeneration and apoptosis by bolstering antioxidant capacity.
• COS-5 and N-5 show significant potential as novel therapeutic agents for the prevention and treatment of AMD.