Cited by 50Extracellular vesicles in diseaseMesenchymal stem cell researchOsteoarthritis Treatment and Mechanisms

Human infrapatellar fat pad mesenchymal stem cells show immunomodulatory exosomal signatures

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Kouroupis, Dimitrios, Kaplan, Lee D., Best, Thomas M.·2022·Scientific Reports

Published version of a preprint

Abstract

Within the human knee infrapatellar fat pad (IFP) and synovium, resident synoviocytes and macrophages contribute to the onset and progression of inflammatory joint diseases. Our hypothesis is that IFP-derived mesenchymal stem cells (IFP-MSC) robust immunomodulatory therapeutic effects are largely exerted via their exosomal (IFP-MSC EXOs) secretome by attenuating synoviocytes and macrophages pro-inflammatory activation. IFP-MSC EXOs showed distinct miRNA and protein immunomodulatory profiles. Reactome analysis of 24 miRNAs highly present in exosomes showed their involvement in the regulation of six gene groups, including immune system. Exosomes were enriched for immunomodulatory and reparative proteins that are involved in positive regulation of cell proliferation, response to stimulus, signal transduction, signal receptor activity, and protein phosphorylation. Stimulated synoviocytes or macrophages exposed to IFP-MSC EXOs demonstrated significantly reduced proliferation, altered inflammation-related molecular profiles, and reduced secretion of pro-inflammatory molecules compared to stimulated alone. In an acute synovial/IFP inflammation rat model, IFP-MSC EXOs therapeutic treatment resulted in robust macrophage polarization towards an anti-inflammatory therapeutic M2 phenotype within the synovium/IFP tissues. Based on these findings, we propose a viable cell-free alternative to MSC-based therapeutics as an alternative approach to treating synovitis and IFP fibrosis.

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Authors
Kouroupis, D., Kaplan, L. D., & Best, T. M.
Affiliations
University of Miami (US)
Corresponding author
Kouroupis, Dimitrios
Venue
Scientific Reports
Published
2022-03-04
Volume
12
Issue
1
Pages
3609-3609
ISSN
2045-2322 (ISSN-L)
OpenAlex
W4220776648
Cited by
50
References
62
Citations by year
2026: 13 · 2025: 15 · 2024: 13 · 2023: 8 · 2022: 1
FWCI
3.02
Type
journal article
Language
en
Open access
Locations
  • Scientific Reports (publishedVersion, cc-by)
  • Research Square (acceptedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
Soffer Family Foundation
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Extracellular vesicles in disease
  • Health Sciences › Medicine › Genetics › Mesenchymal stem cell research
  • Health Sciences › Medicine › Rheumatology › Osteoarthritis Treatment and Mechanisms
Keywords
infrapatellar fat pad, mesenchymal stem cells, exosomes, immunomodulation, synoviocytes, macrophage polarization, M2 macrophages, synovitis, microRNA, cell-free therapy, inflammatory joint diseases
MeSH terms
Adipose Tissue, Animals, Humans, Immunologic Factors, Inflammation, Knee Joint, MicroRNAs, Rats, Exosomes, Mesenchymal Stem Cells

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