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Tumor-Derived Exosomes Contain microRNAs with Immunological Function: Implications for a Novel Immunosuppression

Damiano M Cereghetti, Peter P Lee1

  • 1Department of Cancer Immunotherapeutics & Tumor Immunology (CITI), City of Hope and Beckman Research Institute, Beckman Center, room 5109, 1500 East Duarte Road, Duarte, CA 91010, USA.

Microrna (Shariqah, United Arab Emirates)
|July 30, 2014
PubMed

Insights

Tumor-derived vesicles (TDVs) transport microRNAs (miRNAs) that can suppress immune responses in cancer. These TDVs contain specific miRNAs, like miR-21, which are delivered to immune cells, impacting their function.

Area of Science:

  • Oncology
  • Immunology
  • Molecular Biology

Background:

  • Tumor-derived vesicles (TDVs) are known to mediate immunosuppression by delivering proteins like Fas ligand (FasL).
  • The role of microRNAs (miRNAs) within TDVs in cancer immunosuppression remains largely unexplored.
  • Investigating miRNA cargo in TDVs could reveal novel mechanisms of immune evasion in cancer.

Purpose of the Study:

  • To investigate the presence and function of immunomodulatory miRNAs within TDVs.
  • To determine if TDVs can deliver functional miRNAs to immune cells, thereby contributing to cancer immunosuppression.
  • To explore the link between TDV biogenesis and RNA interference pathways.

Main Methods:

  • Isolation and characterization of TDVs from human tumor cell lines.
  • Quantification of specific miRNA species (hsa-miR-146a, miR-29a, miR-21) within TDVs using RT-PCR.
  • Co-purification of miRNAs within TDVs with argonaute proteins.

Main Results:

  • TDVs isolated from human tumor cells contain multiple miRNA species, including hsa-miR-146a, miR-29a, and miR-21.
  • The breast cancer cell line HCC1806 releases TDVs containing physiologically relevant levels of miR-21.
  • miRNAs packaged within TDVs were found to be associated with argonaute proteins, suggesting functional relevance.

Conclusions:

  • TDVs carry immunomodulatory miRNAs that can potentially suppress immune cell function.
  • The presence of miRNAs and argonaute proteins in TDVs highlights an interconnectedness between vesicle secretion and RNA interference.
  • This finding provides a novel mechanism for TDV-mediated immunosuppression in cancer, opening avenues for therapeutic strategies.

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