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Updated: Jun 4, 2025
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Sequential In vivo Imaging of Osteogenic Stem/Progenitor Cells During Fracture Repair
Published on: May 23, 2014
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Rejuvenating aged osteoprogenitors for bone repair.
Joshua Reeves1,2, Pierre Tournier1, Pierre Becquart1
1Department of Biomedical Sciences, University of Lausanne, Lausanne, Switzerland.
Elife
|December 18, 2024
Summary
Aging impairs bone healing by reducing osteoprogenitor cells. A strategy combining Wnt signaling and intermittent fasting rejuvenates bone repair, restoring youthful function and mitochondrial health in aged mice.
Area of Science:
- Regenerative Medicine
- Aging Biology
- Skeletal Biology
Background:
- Aging leads to decreased tissue regeneration, impacting bone healing in older populations.
- Age-related decline in calvarial bone structure and osteogenic tissues diminishes bone formation capacity.
- Intrinsic cellular deficits, not just cell number, impair bone repair in aged individuals.
Purpose of the Study:
- Investigate age-related impairments in calvarial bone healing.
- Introduce and evaluate a novel two-part rejuvenation strategy to restore youthful bone repair.
- Elucidate the mechanisms underlying age-related decline in osteoprogenitor function.
Main Methods:
- Utilized aged mouse models to study calvarial bone healing.
- Implemented a rejuvenation strategy combining Wnt-mediated osteoprogenitor expansion and intermittent fasting.
- Assessed osteoprogenitor number, function, bone formation, mitochondrial health, NAD+ pathways, and gut microbiota.
Main Results:
- Aging significantly impairs calvarial bone structure, osteogenic tissues, and bone formation.
- Increasing osteogenic cells alone did not rescue repair in aged mice, indicating intrinsic deficits.
- The combined strategy restored bone healing to youthful levels, improving osteoprogenitor function.
- Intermittent fasting's benefits were linked to NAD+-dependent pathways and gut microbiota modulation.
- Mitochondrial dysfunction was identified as a key factor; interventions rejuvenated mitochondrial health and enhanced osteogenesis.
Conclusions:
- A novel rejuvenation strategy effectively restores youthful calvarial bone healing in aged mice.
- Intermittent fasting and Wnt signaling target intrinsic cellular deficits and mitochondrial dysfunction.
- Findings suggest potential therapeutic avenues for age-related bone repair decline and tissue rejuvenation.
Keywords:
Wntagingboneintermittent fastingmouseosteoprogenitorsregenerative medicinerejuvenationstem cellsMore Related Videos
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