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Updated: Jan 30, 2026

In Vivo Immunogenicity Screening of Tumor-Derived Extracellular Vesicles by Flow Cytometry of Splenic T Cells
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In Vivo Immunogenicity Screening of Tumor-Derived Extracellular Vesicles by Flow Cytometry of Splenic T Cells

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An Interferon-Driven Oxysterol-Based Defense against Tumor-Derived Extracellular Vesicles

Angelica Ortiz1, Jun Gui1, Farima Zahedi1

  • 1Department of Biomedical Sciences, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA.

Cancer Cell
|January 16, 2019
PubMed

Insights

Melanoma tumor vesicles educate healthy cells to spread. Cholesterol 25-hydroxylase (CH25H) inhibits this uptake, and reserpine drug shows promise for melanoma treatment.

Area of Science:

  • Immunology
  • Oncology
  • Cell Biology

Background:

  • Tumor-derived extracellular vesicles (TEVs) promote cancer metastasis by altering healthy cells.
  • Melanoma TEVs interfere with the type I interferon (IFN) pathway.

Purpose of the Study:

  • To investigate the role of IFN-inducible cholesterol 25-hydroxylase (CH25H) in melanoma metastasis.
  • To evaluate the therapeutic potential of targeting CH25H or related pathways.

Main Methods:

  • Analyzing TEV interaction with host cells.
  • Measuring CH25H expression and its product, 25-hydroxycholesterol.
  • Utilizing genetically modified mice and pharmacological interventions (reserpine).

Main Results:

  • Melanoma TEVs downregulate the IFN receptor and CH25H expression.
  • CH25H-produced 25-hydroxycholesterol inhibits TEV uptake.
  • Low CH25H levels in patients correlate with poor melanoma prognosis.
  • Mice lacking IFN receptor downregulation and Ch25h were resistant to TEV-induced metastasis.
  • Reserpine suppressed TEV uptake and melanoma lung metastasis.

Conclusions:

  • CH25H is crucial in defending against TEV-mediated cellular education.
  • Reserpine demonstrates potential as an adjuvant therapy for melanoma by disrupting metastasis.
Keywords:
25-hydroxycholesterolIFNAR1adjuvant therapyexosomesextracellular vesiclesinterferonmelanomametastasispre-metastatic nichereserpine

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