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Updated: Dec 27, 2025

Spatial and Temporal Control of Murine Melanoma Initiation from Mutant Melanocyte Stem Cells
06:09

Spatial and Temporal Control of Murine Melanoma Initiation from Mutant Melanocyte Stem Cells

Published on: June 7, 2019

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Particulate mediators of the bystander effect linked to suicide and interferon-β transgene expression in melanoma

Lucrecia Agnetti1, Chiara Fondello1, María Florencia Arbe1

  • 1Unidad de Transferencia Genética, Instituto de Oncología "Ángel H. Roffo", Universidad de Buenos Aires, Buenos Aires, Argentina.

Gene Therapy
|March 5, 2020
PubMed

Insights

Melanoma cells release therapeutic granules after treatment. These "particulate factors" deliver genes and drugs to kill cancer cells, showing promise for new cancer therapies.

Area of Science:

  • Comparative oncology
  • Cancer cell biology
  • Gene therapy

Background:

  • Companion animal melanoma cells serve as valuable models for human cancer research.
  • Understanding cellular responses to therapeutic agents is crucial for treatment optimization.

Purpose of the Study:

  • To investigate the therapeutic potential of particulate factors released from melanoma cells undergoing treatment.
  • To evaluate the gene and drug delivery capabilities of these particulate factors.

Main Methods:

  • Treatment of human, canine, and feline melanoma cells with bleomycin, interferon-β, or herpes simplex virus thymidine kinase/ganciclovir suicide gene (SG) therapy.
  • Isolation and characterization of released nano- and micro-sized granules (particulate factors) using transmission electron microscopy and differential centrifugation.
  • Assessment of the therapeutic gene and drug transfer efficiency and functionality of particulate factors in recipient cells.

Main Results:

  • Treated melanoma cells showed increased granularity and released particulate factors containing therapeutic transgenes and proteins.
  • Particulate factors effectively delivered functional genes and drugs to recipient cells, enabling prodrug activation and cell elimination.
  • The therapeutic cargo within particulate factors remained functional even after exposure to DNase, freezing, or heating.

Conclusions:

  • Particulate factors derived from treated melanoma cells represent a novel delivery system for chemo-gene cancer therapy.
  • These findings highlight the potential clinical application of amplified therapeutic agents encapsulated in delivery vesicles for cancer treatment.

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