Synergistic effects of brain injury and aging: common mechanisms of proteostatic dysfunction

Area of Science:

• Neuroscience
• Molecular Biology
• Gerontology

Background:

• Traumatic brain injury (TBI) triggers acute stress and protein aggregate formation.
• Subtle molecular changes post-TBI can lead to age-associated neurodegenerative disorders.
• The exact molecular pathways driving unhealthy brain aging after TBI remain unclear.

Purpose of the Study:

• To review proteostatic dysfunction as a unifying mechanism in accelerated brain aging following TBI.
• To synthesize evidence from human tissues and animal models concerning TBI, aging, and proteostasis.
• To elucidate the link between TBI-induced proteostatic impairment and subsequent aging hallmarks.

Main Methods:

• Review of existing literature on TBI, brain aging, and proteostasis.
• Examination of human tissue studies.
• Analysis of in vivo animal models investigating injury and aging contexts.

Main Results:

• TBI induces a sustained negative impact on the brain's proteostatic machinery.
• Proteostatic dysfunction is identified as a key factor in unhealthy brain aging post-TBI.
• Evidence supports a link between TBI and the exacerbation of pathological and cognitive aging features.

Conclusions:

• TBI significantly compromises proteostasis, contributing to accelerated brain aging.
• Proteostatic decline following TBI may underlie long-term neurodegenerative changes.
• Targeting proteostasis could offer therapeutic strategies for mitigating TBI's long-term consequences.