Selective neuronal vulnerability to oxidative stress in the brain

Area of Science:

• Neuroscience
• Cellular Biology
• Biochemistry

Background:

• Oxidative stress (OS), an imbalance of reactive oxygen and nitrogen species (ROS/RNS), is implicated in brain aging and neurodegenerative diseases.
• While ROS/RNS are vital signaling molecules, excess levels cause cellular damage, leading to neuronal dysfunction and death.

Purpose of the Study:

• To review the molecular and cellular mechanisms underlying selective neuronal vulnerability (SNV) to OS.
• To identify factors contributing to SNV for developing neuroprotective interventions.

Main Methods:

• Literature review of studies investigating OS and neuronal vulnerability.
• Synthesis of current knowledge on molecular and cellular factors contributing to SNV.

Main Results:

• Vulnerable neurons exhibit high intrinsic OS, high ROS/RNS signaling demand, and low ATP production.
• Mitochondrial dysfunction, heightened inflammatory responses, deficient DNA repair, and glutamate excitotoxicity also contribute to SNV.
• These factors collectively lead to functional decline and cell death in specific neuronal populations.

Conclusions:

• Understanding SNV mechanisms is crucial for developing targeted therapies against age-related neurodegeneration.
• Addressing factors like intrinsic OS, mitochondrial health, and inflammation may protect vulnerable neurons.