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Mesenchymal Stem Cell-Derived Secretome: A New Remedy for the Treatment of Autoimmune and Inflammatory Diseases

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Stem Cells

Abstract

Mesenchymal stem cells (MSCs) are, due to their capacity for immunosuppression, used in experimental and clinical trials as new therapeutic agents for the treatment of autoimmune and inflammatory diseases. However, there are serious safety concerns related to the unwanted differentiation and malignant transformation of engrafted MSCs. Since MSC-based immunosuppression was mainly attributed to the effects of MSC-derived factors, herewith we emphasized molecular and cellular mechanisms that were responsible for the beneficial effects of MSC-sourced secretome in the therapy of autoimmune and inflammatory diseases. MSC-derived extracellular vesicles (MSC-EVs) and MSC-conditioned medium (MSC-CM) are enriched with immunomodulatory factors that regulate phenotype and function of immune cells in injured tissues. Suppressed generation of inflammatory M1 macrophages, due to their conversion in M2 immunosuppressive phenotype, reduced capacity for antigen presentation of dendritic cells (DCs), and attenuated activation of T lymphocytes and natural killer T (NKT) cells were observed in MSC-EVs and MSC-CM-treated experimental animals. Therapeutic use of MSC-sourced secretome favored the development of tolerogenic DCs and induced expansion of immunosuppressive cells. Both local and systemic administration of MSC-derived factors resulted in an increased expansion of immunosuppressive M2 macrophages, FoxP3-expressing T, and NKT cells in inflamed tissues that led to the enhanced tissue repair and regeneration. Results obtained in a large number of animal studies and several clinical trials confirmed the beneficial effects of MSC-sourced bioactive products in the suppression of ongoing inflammation. In summing up, MSC-derived secretome could be considered as a new remedy for the treatment of autoimmune and inflammatory diseases.

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Abbreviations

AF:

Amniotic fluid

Ang-1:

Angiopoietin-1

AT:

Adipose tissue

CTLs:

Cytotoxic T-lymphocytes

bFGF:

Basic fibroblast growth factor

BNDF:

Brain derived neurotrophic factor

DCs:

Dendritic cells

DP:

Dental pulp

ESCs:

Embryonic stem cells

EVs:

Extracellular vesicles

Exos:

Exosomes

Exo-d-MAPPS:

Exosome-derived Multiple Allogeneic Protein Paracrine Signaling

FasL:

First apoptosis signal ligand

HGF:

Hepatic growth factor

HO-1:

Hemeoxygenase-1 (HO-1)

IDO:

Indolamine 2,3-dioxygenase

IL:

Interleukin

IL-R:

IL-1 receptor

IL-Ra:

IL-1 receptor antagonist

LECs:

Lung epithelial cells

LPS:

Lipopolysaccharides

MHC:

Major histocompatibility complex

MicroRNAs:

miRNAs

MIF:

Migration inhibitory factor

M-CSF:

Monocyte colony-stimulating factor

MSCs:

Mesenchymal stem cells

MSC-CM:

MSC-derived conditioned medium

MSC-Exos:

MSC-derived exosomes

MSC-EVs:

MSC-derived extracellular vesicles

NK:

Natural killer

NKT:

Natural killer T-cells

NO:

Nitric oxide

OPN:

Osteopontin

PAX5:

Paired box 5

PGF:

Placental growth factor

ST:

Synovial tissue

TGF-β:

Transforming growth factor-β

UC:

Umbilical cord

PEDF:

Pigment epithelium-derived factor

PGE2:

Prostaglandin E2

PTECs:

Proximal tubular epithelial cells

TSG-6:

TNF-α stimulated gene/protein 6

VEFG:

Vascular endothelial growth factor

TIMP1:

Tissue inhibitor of metalloproteinase-1

TRAIL:

TNF-related apoptosis-inducing ligand

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© 2021 The Author(s), under exclusive license to Springer Nature Switzerland AG

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Harrell, C.R., Volarevic, V. (2021). Mesenchymal Stem Cell-Derived Secretome: A New Remedy for the Treatment of Autoimmune and Inflammatory Diseases. In: Haider, K.H. (eds) Stem Cells. Springer, Cham. https://doi.org/10.1007/978-3-030-77052-5_4

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