Characterization and priming of equine muscle-derived mesenchymal stem cells to enhance their anti-inflammatory and immunomodulatory profiles.
Abstract: A minimally invasive microbiopsy-based method for the isolation of mesenchymal stem cells (MSCs) from equine skeletal muscle (M-MSCs) provides a readily accessible source of MSCs for clinical applications. We examined the expression of genes associated with immunomodulation and anti-inflammatory pathways, in addition to those of growth factors and the major histocompatibility complex (MHC) molecules I and II, at constitutive levels and after priming with inflammatory cytokines, an immunostimulant, and heat-shocking. While there was notable variation between the M-MSCs from each of the horses in their constitutive expression of many of the genes examined, and in their responses to the different priming methods, priming with TNF- and IFN- increased the expression of genes associated with anti-inflammatory pathways, immunomodulation, and tissue repair. M-MSCs from all horses constitutively expressed and lacked expression of ; only heat-shocking induced the expression of . The responses to priming, together with their ease of harvesting, supports further investigation into the use of M-MSCs as a therapy for inflammatory and immune-mediated conditions in the horse. However, due to the variability between M-MSCs from different individuals, characterization of the cells before autologous administration, and the selection of those cells most fit-for-purpose in the case of allogeneic transfer, is recommended.
Copyright © 2026 Shahid, Guitart, Bertin, Simon, Ceusters, Serteyn and Whitworth.
Publication Date: 2026-01-12 PubMed ID: 41602612PubMed Central: PMC12832516DOI: 10.3389/fvets.2025.1741322Google Scholar: Lookup
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Summary
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Overview
- This study investigates mesenchymal stem cells (MSCs) derived from horse skeletal muscle using a minimally invasive biopsy method.
- It evaluates how priming these cells with various stimuli enhances their anti-inflammatory and immunomodulatory functions for potential therapeutic use.
Background and Purpose
- MSCs are multipotent stem cells capable of modulating immune responses and promoting tissue repair.
- Equine MSCs can be isolated from skeletal muscle using a microbiopsy method (M-MSCs), which is minimally invasive and clinically practical.
- The goal is to characterize these M-MSCs in terms of gene expression related to immune modulation, inflammation control, growth factors, and major histocompatibility complex (MHC) molecules.
- Evaluating the baseline (constitutive) expression of these genes and how this changes after priming with inflammatory cytokines, immunostimulants, or heat shock gives insight into how these cells might be optimized for therapeutic use.
Methods
- M-MSCs were harvested from multiple individual horses using minimally invasive microbiopsy techniques.
- Gene expression levels were measured for:
- Immunomodulatory and anti-inflammatory pathways
- Growth factors linked to tissue repair
- MHC class I and II molecules (important for immune recognition)
- Cells were subjected to different priming techniques:
- Exposure to inflammatory cytokines TNF-α (tumor necrosis factor-alpha) and IFN-γ (interferon-gamma)
- Exposure to a general immunostimulant
- Heat-shock treatment
- Gene expression was then re-assessed to identify changes induced by priming.
Key Findings
- There was considerable variability in constitutive gene expression profiles between M-MSCs from different horses.
- Priming with TNF-α and IFN-γ consistently upregulated genes involved in anti-inflammatory responses, immunomodulation, and tissue repair.
- All M-MSCs constitutively expressed certain genes (these seem to be immunomodulatory or anti-inflammatory, although specific names are missing from the abstract).
- MHC class I was expressed consistently, while MHC class II was absent at baseline and only induced by heat-shocking.
- Heat-shock priming could induce additional gene expressions not seen under other conditions, including MHC class II.
Implications for Therapy
- The findings suggest that M-MSCs can be effectively primed to enhance their therapeutic potential by boosting their anti-inflammatory and immunomodulatory functions.
- The variability in gene expression profiles among horses indicates a need for pre-treatment characterization of MSCs when using autologous (self-derived) therapies.
- For allogeneic (donor-derived) therapies, selecting donor cells with optimal gene expression profiles and priming responsiveness is important to ensure efficacy.
- Because these M-MSCs can be harvested easily and minimally invasively, they represent a promising cell source for treating inflammatory and immune-mediated conditions in horses.
Conclusions and Recommendations
- M-MSCs show potential as a practical and effective cell therapy for inflammation-related conditions in equine medicine.
- Priming with inflammatory cytokines like TNF-α and IFN-γ is a promising strategy to enhance their therapeutic properties.
- However, individual variability requires a tailored approach, including thorough cell characterization before clinical use.
- Future work is recommended to further explore the therapeutic applications and optimize protocols for MSC priming and selection.
Cite This Article
APA
Shahid MA, Guitart AS, Bertin FR, Simon O, Ceusters J, Serteyn D, Whitworth DJ.
(2026).
Characterization and priming of equine muscle-derived mesenchymal stem cells to enhance their anti-inflammatory and immunomodulatory profiles.
Front Vet Sci, 12, 1741322.
https://doi.org/10.3389/fvets.2025.1741322 Publication
Researcher Affiliations
- The University of Queensland, Brisbane, QLD, Australia.
- The University of Queensland, Brisbane, QLD, Australia.
- The University of Queensland, Brisbane, QLD, Australia.
- The University of Adelaide, Adelaide, SA, Australia.
- Universite de Liege, Liège, Belgium.
- Universite de Liege, Liège, Belgium.
- The University of Queensland, Brisbane, QLD, Australia.
Conflict of Interest Statement
The method for the isolation and maintenance of the M-MSCs used in this study is patented: Mammalian muscle-derived stem cells, WO2015091210. JC and DS are co-inventors on this patent. The remaining author(s) declared that this work was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
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