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Human Melanoma-Derived Extracellular Vesicles Regulate Dendritic Cell Maturation.

Rachel L G Maus1, James W Jakub2, Wendy K Nevala3

  • 1Department of Immunology, Mayo Graduate School, Mayo Clinic, Rochester, MN, USA.

Frontiers in Immunology
|April 21, 2017
PubMed
Summary

Melanoma extracellular vesicles (EVs) impair dendritic cell (DC) maturation, potentially establishing a pre-metastatic niche in sentinel lymph nodes (SLNs). This research highlights melanoma EV cargo as a key factor in immune dysfunction during metastasis.

Keywords:
dendritic cellsextracellular vesicleslymphaticsmetastasistumor immunology

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Area of Science:

  • Cancer Biology
  • Immunology
  • Cell Biology

Background:

  • Melanoma metastasis heavily relies on lymphatic spread to regional lymph nodes.
  • The mechanisms of early metastatic dissemination and pre-metastatic niche formation are not fully understood.
  • Previous studies identified immune dysfunction, including reduced dendritic cell (DC) maturation markers, in sentinel lymph nodes (SLNs) before metastasis.

Purpose of the Study:

  • To investigate the role of melanoma-derived extracellular vesicles (EVs) in mediating the pre-metastatic niche.
  • To determine if melanoma EVs can polarize DCs and impair their maturation.
  • To identify specific cargo within melanoma EVs responsible for DC modulation.

Main Methods:

  • In vitro maturation of DCs in the presence of melanoma EVs.
  • Analysis of DC maturation markers (CD83, CD86) and chemokine expression (Flt3L, IL15, MIP-1α, MIP-1β).
  • Proteomic and RNA profiling of melanoma EV cargo, including S100A8 and S100A9 proteins.
  • Isolation of EVs from human afferent lymphatic fluid ex vivo.

Main Results:

  • Melanoma EVs significantly impaired DC maturation markers (CD83, CD86) and reduced expression of key chemokines.
  • Specific EV cargo, including S100A8 and S100A9 proteins, mimicked the inhibitory effects of whole EVs on DC maturation.
  • Melanoma-like EVs were successfully isolated from human lymphatic fluid.

Conclusions:

  • Melanoma-derived EVs, through their cargo, compromise DC maturation, suggesting a mechanism for establishing a pre-metastatic niche.
  • This immune modulation in tumor-draining SLNs may be a strategy employed by primary melanomas to facilitate metastasis.
  • Further research into melanoma EV cargo is warranted to understand and potentially target this pre-metastatic niche formation.