Theranostics 2018; 8(5):1399-1410. doi:10.7150/thno.21072

Research Paper

Mesenchymal stem cells-derived exosomes are more immunosuppressive than microparticles in inflammatory arthritis

Stella Cosenza1,2, Karine Toupet1,2, Marie Maumus 1,2, Patricia Luz-Crawford3, Olivier Blanc-Brude4, Christian Jorgensen1,2,5*, Danièle Noël1,2,5✉*

1. Inserm, U1183, Saint-Eloi Hospital, Montpellier, France;
2. Montpellier University, UFR de Médecine, Montpellier, France;
3. Laboratorio de Inmunología Celular y Molecular, Centro de Investigación Biomédica, Facultad de Medicina, Universidad de Los Andes, Santiago, Chile,
4. Inserm, UMRs-970, Centre de Recherche Cardiovasculaire de Paris, PRES Sorbonne-Paris-Cité, Université Paris-Descartes, France;
5. Clinical immunology and osteoarticular diseases Therapeutic Unit, Hôpital Lapeyronie, Montpellier, France
*: equally contributing authors

Abstract

Objectives: Mesenchymal stem cells (MSCs) release extracellular vesicles (EVs) that display a therapeutic effect in inflammatory disease models. Although MSCs can prevent arthritis, the role of MSCs-derived EVs has never been reported in rheumatoid arthritis. This prompted us to compare the function of exosomes (Exos) and microparticles (MPs) isolated from MSCs and investigate their immunomodulatory function in arthritis.

Methods: MSCs-derived Exos and MPs were isolated by differential ultracentrifugation. Immunosuppressive effects of MPs or Exos were investigated on T and B lymphocytes in vitro and in the Delayed-Type Hypersensitivity (DTH) and Collagen-Induced Arthritis (CIA) models.

Results: Exos and MPs from MSCs inhibited T lymphocyte proliferation in a dose-dependent manner and decreased the percentage of CD4+ and CD8+ T cell subsets. Interestingly, Exos increased Treg cell populations while parental MSCs did not. Conversely, plasmablast differentiation was reduced to a similar extent by MSCs, Exos or MPs. IFN-γ priming of MSCs before vesicles isolation did not influence the immunomodulatory function of isolated Exos or MPs. In DTH, we observed a dose-dependent anti-inflammatory effect of MPs and Exos, while in the CIA model, Exos efficiently decreased clinical signs of inflammation. The beneficial effect of Exos was associated with fewer plasmablasts and more Breg-like cells in lymph nodes.

Conclusions: Both MSCs-derived MPs and Exos exerted an anti-inflammatory role on T and B lymphocytes independently of MSCs priming. However, Exos were more efficient in suppressing inflammation in vivo. Our work is the first demonstration of the therapeutic potential of MSCs-derived EVs in inflammatory arthritis.

Keywords: mesenchymal stem cells, extracellular vesicles, trophic factors, cell therapy, rheumatoid arthritis

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How to cite this article:
Cosenza S, Toupet K, Maumus M, Luz-Crawford P, Blanc-Brude O, Jorgensen C, Noël D. Mesenchymal stem cells-derived exosomes are more immunosuppressive than microparticles in inflammatory arthritis. Theranostics 2018; 8(5):1399-1410. doi:10.7150/thno.21072. Available from http://www.thno.org/v08p1399.htm