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Isolation And Dendritic Cell-Uptake of Small Extracellular Vesicles from Echinococcus granulosus

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Ewing Sarcoma-Derived Extracellular Vesicles Impair Dendritic Cell Maturation and Function.

Hendrik Gassmann¹, Kira Schneider¹, Valentina Evdokimova^2,3

¹Department of Pediatrics, Children's Cancer Research Center, Kinderklinik München Schwabing, School of Medicine, Technical University of Munich, 80804 Munich, Germany.

|August 27, 2021

Summary

This summary is machine-generated.

Ewing sarcoma EVs promote an immunosuppressive tumor microenvironment by targeting myeloid cells. These EVs impair dendritic cell differentiation, hindering T cell responses and weakening anti-tumor immunity.

Keywords:

Ewing sarcoma dendritic cells extracellular vesicles immunosuppression inflammation myeloid cells tumor microenvironment

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Area of Science:

Oncology
Immunology
Cell Biology

Background:

Ewing sarcoma (EwS) is a pediatric cancer with limited T cell infiltration and abundant immunosuppressive myeloid cells.
Extracellular vesicles (EVs) play a crucial role in cancer-host interactions.
This study investigates the role of EwS-derived EVs in modulating myeloid cell function and immune suppression.

Purpose of the Study:

To determine if EVs secreted by EwS tumors target myeloid cells.
To investigate the impact of EwS EVs on myeloid cell differentiation and function.
To understand how EwS EVs contribute to the immunosuppressive tumor microenvironment.

Main Methods:

Purification of EVs from EwS and fibroblast cell lines.
Treatment of myeloid cells with EwS EVs and analysis of cytokine release.
Assessment of dendritic cell differentiation markers (CD80, CD86, HLA-DR).
Whole transcriptome analysis of treated myeloid cells.
Functional assays evaluating T cell proliferation and cytokine secretion.

Main Results:

EwS EVs, but not fibroblast EVs, induced pro-inflammatory cytokine release (IL-6, IL-8, TNF) from myeloid cells.
EwS EVs impaired myeloid cell differentiation into monocytic-derived dendritic cells (moDCs).
Transcriptome analysis revealed activation of immunosuppressive and pro-inflammatory gene expression programs.
moDCs differentiated with EwS EVs inhibited T cell proliferation and IFNγ release, while increasing IL-10 and IL-6 secretion.

Conclusions:

Ewing sarcoma EVs promote a pro-inflammatory and immunosuppressive tumor microenvironment.
EwS EVs weaken adaptive immunity by impairing antigen-presenting cell differentiation and function.
Targeting EwS EVs may represent a novel therapeutic strategy for Ewing sarcoma.