Molecular and cellular pathways contributing to brain aging.

Area of Science:

• Neurobiology
• Gerontology
• Brain Health

Background:

• Aging is the primary risk factor for neurodegenerative diseases.
• Brain aging involves decreased neurophysiological functions, impaired neuroplasticity, and disrupted cellular homeostasis.
• Key molecular pathways like oxidative stress, inflammation, and metabolic dysregulation (autophagy, mitochondrial function) link aging to neurodegeneration.

Purpose of the Study:

• To understand the biological mechanisms of aging relevant to brain health.
• To explore how aging affects neurophysiological functions and cellular processes.
• To identify factors influencing brain aging and neurodegenerative disease susceptibility.

Main Methods:

• Review of molecular and cellular mechanisms of brain aging.
• Analysis of pathways including oxidative stress, inflammation, energy metabolism, and key modulators (IGF-1, mTOR, ROS, AMPK, SIRTs, p53).
• Evaluation of the impact of lifestyle interventions like calorie restriction, physical exercise, and mental activities.

Main Results:

• Brain aging is characterized by reduced neuroplasticity, disrupted calcium (Ca2+) homeostasis, neuroinflammation, and oxidative damage.
• Metabolic dysregulation, including impaired autophagy and mitochondrial dysfunction, is central to brain aging.
• Calorie restriction (CR) demonstrates neuroprotective effects by reducing reactive oxygen species (ROS) generation, maintaining Ca2+ homeostasis, and inhibiting apoptosis.

Conclusions:

• Understanding aging mechanisms is crucial for maintaining brain health.
• Lifestyle interventions like CR, exercise, and mental activity enhance nervous system resistance to age-related diseases.
• Emerging molecular and cellular neurobiology methods show potential for enhancing brain cell adaptation and resistance to aging and neurodegeneration.