Inflammatory licensed equine MSCs are chondroprotective and exhibit enhanced immunomodulation in an inflammatory environment.
- Journal Article
- Research Support
- Non-U.S. Gov't
Summary
This study explores the effects of using inflammatory licensed mesenchymal stem cells (MSCs) to promote tissue repair. The researchers found that these stem cells not only modulate immune responses but are also protective of cartilage cells, providing potential new avenues for MSC therapies.
Objective of Research
The primary goal of this research was to understand how the environmental conditions inside a recipient body affect the functioning of mesenchymal stem cells (MSCs) that have been modified through inflammatory licensing. The researchers also wanted to understand the impact of the MSC secretome – the substances secreted by these stem cells – on the stability of chondrocytes, or cartilage cells.
Methodology
- The scientists generated inflammatory licensed MSCs by priming with interferon-gamma (IFN-γ) or polyinosinic:polycytidylic acid, also known as poly I:C.
- They then polarized macrophages, a type of white blood cell, to an inflammatory phenotype using IFN-γ. These macrophages were designed to mimic an injured tissue environment.
- The licensed MSCs were co-cultured with this inflammatory environment and their ability to modulate the immune response was assessed.
- They analyzed gene expression in the MSCs to observe any changes relating to immunogenicity, immunomodulation, cytokine levels, and chemokine expression.
- The scientists also studied the effects on macrophages, looking at changes in cytokine and chemokine expression there.
- The medium from the IFN-γ or poly I:C-primed MSCs, representing their secretome, was applied to chondrocytes that had been stimulated by IL-1β. They then analyzed these chondrocytes for alterations in genes associated with catabolic action and matrix synthesis.
Findings of the Research
- The study found that IFN-γ-primed MSCs were better equipped at suppressing T-cell proliferation compared to their unprimed counterparts. Their ability was preserved even after exposure to inflammatory macrophages.
- MHC-I and MHC-II gene expression was upregulated in both licensed and unlicensed MSCs when exposed to inflammatory macrophages.
- The secretome from licensed MSCs had a protective effect on chondrocytes and decreased inflammatory gene expression in chondrocytes triggered by IL-1β.
- Furthermore, they found that inflammatory agents in vitro improved immunomodulation ability of MSCs exposed to inflammatory macrophages and the resulting secretome protected chondrocytes against catabolic stimulation.
Clinical Implications
The study found that in-vitro licensing prior to therapeutic application can result in a more consistent and predictable immune and reparative response to MSC therapy compared to in-vivo inflammatory licensing. This is a significant finding, as it could lead to the development of more effective MSC therapies for conditions that involve cartilage damage or degeneration, such as osteoarthritis or rheumatoid arthritis.
Cite This Article
Publication
Researcher Affiliations
- Department of Clinical Sciences, College of Veterinary Medicine, Cornell University, Ithaca, NY, 14853, USA.
- Department of Clinical Sciences, College of Veterinary Medicine, North Carolina State University, 1060 William Moore Drive, Raleigh, NC, 27607, USA.
- Department of Clinical Sciences, College of Veterinary Medicine, Cornell University, Ithaca, NY, 14853, USA.
- Department of Clinical Sciences, College of Veterinary Medicine, Cornell University, Ithaca, NY, 14853, USA. laf4@cornell.edu.
MeSH Terms
- Animals
- Cells, Cultured
- Chondrocytes / metabolism
- Cytokines / genetics
- Cytokines / metabolism
- Extracellular Matrix Proteins / genetics
- Extracellular Matrix Proteins / metabolism
- Female
- Histocompatibility Antigens Class I / genetics
- Histocompatibility Antigens Class I / metabolism
- Histocompatibility Antigens Class II / genetics
- Histocompatibility Antigens Class II / metabolism
- Horses
- Immunomodulation
- Macrophages / immunology
- Male
- Mesenchymal Stem Cells / immunology
Conflict of Interest Statement
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