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Enhancing Late-Life Survival and Mobility via Mitohormesis by Reducing Mitochondrial Calcium Levels
Doruntina Bresilla1, Ines Tawfik1, Martin Hirtl1
1Division of Molecular Biology and Biochemistry, Medical University of Graz, Graz, Austria.
Aging Cell
|September 26, 2025
Summary
Inhibiting mitochondrial calcium uptake in C. elegans extends lifespan and improves healthspan by activating antioxidant pathways. This anti-aging strategy involves reactive oxygen species and has potential human health implications.
Area of Science:
- Cellular Biology
- Aging Research
- Mitochondrial Physiology
Background:
- Mitochondrial calcium (Ca2+) homeostasis is crucial for cellular fitness and aging.
- Understanding how to modulate mitochondrial Ca2+ uptake offers potential anti-aging strategies.
Purpose of the Study:
- To investigate the effects of genetic and pharmacological inhibition of mitochondrial Ca2+ uptake on lifespan and health in *Caenorhabditis elegans*.
- To elucidate the molecular mechanisms underlying the observed longevity benefits.
Main Methods:
- RNA interference (RNAi) to knockdown the mitochondrial calcium uniporter homolog (mcu-1) in *C. elegans*.
- Live-cell imaging to assess mitochondrial Ca2+ levels.
- Pharmacological inhibition of mitochondrial Ca2+ uptake using mitoxantrone.
- Analysis of reactive oxygen species (ROS) production and downstream signaling pathways (pmk-1, daf-16, skn-1).
- Assessment of mitochondrial structure, function, NAD+/NADH ratio, and oxygen consumption rates.
- Experiments in human foreskin fibroblasts to assess translational relevance.
Main Results:
- mcu-1 knockdown extended lifespan and preserved motility in aged nematodes, requiring intervention before day 14.
- Longevity was associated with a transient increase in ROS, activating pmk-1, daf-16, and skn-1 pathways.
- These pathways promoted antioxidant defenses, preserved mitochondrial integrity, and restored youthful metabolic parameters.
- Pharmacological inhibition with mitoxantrone mimicked these effects, extending lifespan and improving fitness in aged nematodes.
- Mitoxantrone treatment in human cells also transiently increased ROS and enhanced antioxidant enzyme activity.
Conclusions:
- Modulation of mitochondrial Ca2+ uptake induces mitohormesis via ROS-mediated signaling, promoting longevity and healthspan in nematodes.
- The findings suggest a conserved mechanism with potential implications for healthy human aging.
- Targeting mitochondrial Ca2+ uptake represents a promising avenue for developing novel anti-aging interventions.
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