Cited by 104Extracellular vesicles in diseaseImmune cells in cancerCancer Immunotherapy and Biomarkers

Differential Content of Proteins, mRNAs, and miRNAs Suggests that MDSC and Their Exosomes May Mediate Distinct Immune Suppressive Functions

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Geis-Asteggiante, Lucía, Belew, Ashton T., Clements, Virginia K., Edwards, Nathan J., Ostrand-Rosenberg, Suzanne, El-Sayed, Najib M., Fenselau, Catherine·2018·Journal of Proteome Research

Abstract

Myeloid-derived suppressor cells (MDSC) are immature myeloid cells that accumulate in the circulation and the tumor microenvironment of most cancer patients. There, MDSC suppress both adaptive and innate immunity, hindering immunotherapies. The inflammatory milieu often present in cancers facilitates MDSC suppressive activity, causing aggressive tumor progression and metastasis. MDSC from tumor-bearing mice release exosomes, which carry biologically active proteins and mediate some of the immunosuppressive functions characteristic of MDSC. Studies on other cell types have shown that exosomes may also carry RNAs which can be transferred to local and distant cells, yet the mRNA and microRNA cargo of MDSC-derived exosomes has not been studied to date. Here, the cargo of MDSC and their exosomes was interrogated with the goal of identifying and characterizing molecules that may facilitate MDSC suppressive potency. Because inflammation is an established driving force for MDSC suppressive activity, we used the well-established 4T1 mouse mammary carcinoma system, which includes "conventional" as well as "inflammatory" MDSC. We provide evidence that MDSC-derived exosomes carry proteins, mRNAs, and microRNAs with different quantitative profiles than those of their parental cells. Several of these molecules have known or predicted functions consistent with MDSC suppressive activity, suggesting a potential mechanistic redundancy.

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Authors
Geis-Asteggiante, L., Belew, A. T., Clements, V. K., Edwards, N. J., Ostrand-Rosenberg, S., El-Sayed, N. M., & Fenselau, C.
Affiliations
  • Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, United States
  • University of Maryland, College Park (US)
  • University of Maryland, Baltimore County (US)
  • Georgetown University Medical Center (US)
  • Department of Biological Sciences, University of Maryland Baltimore County, Baltimore, Maryland 21250, United States
Venue
Journal of Proteome Research
Published
2017-11-27
Volume
17
Issue
1
Pages
486-498
ISSN
  • 1535-3893 (ISSN-L)
  • 1535-3907
OpenAlex
W2768796960
Cited by
104
References
85
Citations by year
2026: 4 · 2025: 10 · 2024: 8 · 2023: 14 · 2022: 14 · 2021: 15 · 2020: 20 · 2019: 11 · 2018: 8
FWCI
4.35
Type
journal article
Language
en
Open access
Locations
  • Journal of Proteome Research (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
  • Maryland Shared Open Access Repository (USMAI Consortium) (submittedVersion)
  • Digital Repository at the University of Maryland (University of Maryland College Park)
Funders
  • NIH Office of the Director (OD019938)
  • National Institute of Allergy and Infectious Diseases (AI094773)
  • University of Maryland
  • National Institute of General Medical Sciences (GM021248)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Extracellular vesicles in disease
  • Life Sciences › Immunology and Microbiology › Immunology › Immune cells in cancer
  • Health Sciences › Medicine › Oncology › Cancer Immunotherapy and Biomarkers
Keywords
myeloid-derived suppressor cells, exosomes, immunosuppression, microRNA cargo, protein cargo, tumor microenvironment, inflammation, 4T1 mammary carcinoma, cancer immunotherapy resistance
MeSH terms
Myeloid-Derived Suppressor Cells, Animals, Immunity, Inflammation, Proteins, RNA, Messenger, MicroRNAs, Mice, Exosomes

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