Equine peripheral blood-derived mesenchymal stem cells: isolation, identification, trilineage differentiation and effect of hyperbaric oxygen treatment.
Authors: Dhar M, Neilsen N, Beatty K, Eaker S, Adair H, Geiser D
Journal: Equine veterinary journal
Summary
# Editorial Summary Peripheral blood offers a theoretically accessible source of mesenchymal stem cells (MSCs) for equine regenerative medicine, yet their practical utility has remained unclear due to inconsistent proliferation rates and poor differentiation capacity, particularly towards adipocytes. Dhar and colleagues systematically characterised equine peripheral blood-derived MSCs and investigated whether hyperbaric oxygen (HBO) treatment could enhance stem cell mobilisation into circulation—an approach previously demonstrated in rodent and human models but not yet explored in horses. The researchers successfully isolated and identified MSCs from blood samples and demonstrated functional trilineage differentiation capacity (osteogenic, chondrogenic, and adipogenic pathways), establishing that culture conditions significantly influence cell behaviour. HBO treatment appeared to mobilise additional stem cells into the peripheral circulation, potentially offering a non-invasive method to increase cell yield before harvesting. These findings have important implications for practitioners considering regenerative therapies: peripheral blood MSCs represent a viable alternative to bone marrow or adipose tissue sources if proper isolation and culture protocols are employed, and pre-treatment with HBO may provide a practical strategy to improve cell recovery rates in clinical applications.
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Practical Takeaways
- •Peripheral blood offers a less invasive alternative to bone marrow for obtaining mesenchymal stem cells in horses, provided culture conditions are optimized for cell adherence and proliferation
- •Hyperbaric oxygen therapy may have potential to enhance stem cell mobilization in equine patients, though equine-specific research is needed before clinical application
- •Understanding the limitations of adipogenic differentiation in equine peripheral blood-derived stem cells is important for setting realistic expectations in regenerative medicine protocols
Key Findings
- •Equine peripheral blood can serve as a viable source of adult mesenchymal stem cells when appropriate cell culture conditions are established
- •Previous studies reported variability in proliferation and limited adipocyte differentiation, questioning the adipogenic potential of equine peripheral blood-derived mesenchymal stem cells
- •Hyperbaric oxygen treatment mobilizes hematopoietic progenitor stem cells in humans and mice, but this effect has not been documented in horses