Mitochondrial drivers of stem cell aging and inflammaging

Area of Science:

• Mitochondrial biology
• Aging research
• Immunology

Background:

• Mitochondria are key regulators of aging, influencing energy, redox balance, stem cells, and immunity.
• Mitochondrial dysfunction is a hallmark and driver of stem cell exhaustion and inflammaging.

Purpose of the Study:

• To review evidence linking mitochondrial dysfunction to aging processes.
• To explore how mitochondrial damage triggers inflammation and senescence.
• To evaluate mitochondria-targeted rejuvenation strategies.

Main Methods:

• Literature synthesis of current research on mitochondria and aging.
• Analysis of mechanisms including mtDNA mutations, quality control, and danger signaling.
• Evaluation of therapeutic interventions.

Main Results:

• Age-associated mtDNA mutations and impaired mitochondrial quality control lead to stem cell exhaustion and inflammaging.
• Mitochondrial damage signals activate inflammatory pathways (e.g., cGAS-STING, NF-κB), promoting chronic inflammation.
• Nicotinamide adenine dinucleotide (NAD+) depletion links redox collapse to senescence and regenerative decline.

Conclusions:

• Mitochondrial dysfunction is a central driver of aging, stem cell exhaustion, and inflammaging.
• Targeting mitochondria offers potential for healthspan extension.
• Emerging strategies include NAD+ repletion, mitophagy enhancement, and mtDNA editing.