Neuroimmune dynamics and brain aging: mechanisms and consequences.

Area of Science:

• Neuroscience
• Immunology
• Gerontology

Background:

• Brain aging alters neuroimmune interactions, affecting resilience and vulnerability.
• Healthy aging involves cooperation between glial cells, neurons, vascular elements, and peripheral immune inputs.
• Aging leads to immune remodeling and systemic inflammaging, shifting glial cell activity and neuronal function.

Purpose of the Study:

• Synthesize knowledge on cellular, systemic, and molecular mechanisms of neuroimmune aging.
• Emphasize how dysregulation contributes to cognitive decline and neurodegenerative disease vulnerability.
• Highlight frameworks for integrative approaches to brain aging.

Main Methods:

• Review and synthesis of current scientific literature on neuroimmune aging.
• Analysis of cellular, systemic, and molecular mechanisms.
• Exploration of factors modulating aging trajectories, including sex differences, epigenetics, and systemic influences.

Main Results:

• Aging-related immune remodeling and inflammaging compromise synaptic function and cognitive performance.
• These processes range from subtle impairments in normal aging to accelerated neurodegeneration.
• Sex differences, epigenetics, and systemic factors like the gut microbiome modulate aging pathways.

Conclusions:

• Brain aging is a networked process influenced by CNS and peripheral factors.
• Integrative models considering distal organs, immune cells, microbiome, and lifestyle are essential.
• Understanding neuroimmune dynamics is crucial for developing strategies to maintain cognitive health and combat neurodegeneration.