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Articular cartilage regeneration by activated skeletal stem cells
Matthew P Murphy1,2,3, Lauren S Koepke2, Michael T Lopez2
1Institute for Stem Cell Biology and Regenerative Medicine, Stanford University School of Medicine, Stanford, CA, USA.
Nature Medicine
|August 19, 2020
Summary
Aging diminishes cartilage repair by reducing skeletal stem cells (SSCs). However, microfracture surgery combined with growth factors can stimulate SSCs to regenerate articular cartilage for osteoarthritis treatment.
Area of Science:
- Regenerative Medicine
- Stem Cell Biology
- Orthopedic Research
Background:
- Osteoarthritis (OA) involves progressive articular cartilage destruction.
- Aging is a key factor in OA development, linked to reduced regenerative capacity.
- Skeletal stem cells (SSCs) are crucial for cartilage repair.
Purpose of the Study:
- To investigate the impact of aging on SSCs and cartilage regeneration.
- To explore methods for stimulating cartilage repair in aged joints.
- To assess the potential of SSCs for treating localized cartilage defects in OA.
Main Methods:
- Assessed age-related changes in SSC populations and chondrogenesis in mice and humans.
- Utilized microfracture (MF) surgery to stimulate SSCs in adult mouse limb joints.
- Investigated the effect of co-delivering BMP2 and soluble VEGFR1 (sVEGFR1) in a hydrogel on MF-activated SSC differentiation.
Main Results:
- Aging leads to a decline in SSCs and impaired chondrogenesis in both species.
- Microfracture surgery successfully triggered local SSC expansion in mouse joints.
- Co-delivery of BMP2 and sVEGFR1 via hydrogel promoted articular cartilage formation from MF-activated SSCs, mitigating fibrous tissue development.
Conclusions:
- Resident skeletal stem cells possess regenerative potential for articular cartilage.
- Aging negatively impacts the regenerative capacity of SSCs.
- Targeted stimulation and modulation of SSC differentiation hold promise for treating localized cartilage defects in osteoarthritis.
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