Tumor regression induced by intratumoral injection of DNA coding for human interleukin 12 into melanoma metastases in gray horses.
- Journal Article
Summary
This research used gray horses, which naturally develop melanoma similar to that in humans, to test a new immunotherapy treatment for metastatic melanoma. The research found that injecting the gene coding for the human protein interleukin 12 into existing melanoma tumors caused significant shrinkage, and in one horse the tumor disappeared entirely without recurring.
Study Overview
The scientists conducted preclinical studies to explore new therapeutic principles to combat melanoma using a novel animal model: gray horses. Gray horses were used because they develop metastatic melanoma like human disease and therefore present a highly relevant model for the testing of new immunotherapy protocols.
Immunotherapy Protocols
- Scientists tested a method involving the injection of plasmid DNA that codes for the human cytokine interleukin 12 into established metastases.
- Interleukin 12 is a cytokine, a type of signaling molecule in the immune system that helps coordinate the body’s response to infections and diseases. It has been linked to the body’s ability to fight off cancer.
- Through this method, the intention was to stimulate the immune system of the horse to recognize and destroy the melanoma cells.
Results
- Injection of the plasmid DNA led to significant regression in all 12 treated melanoma lesions across seven horses.
- In one treated lesion, complete disappearance was observed, and importantly, there was no recurrence of the tumor after 6 months.
- No adverse events or side effects were observed in any of the horses during and after treatment, which suggested that the studied immunotherapy protocol was safe and well-tolerated.
Implications of Research
- This research provides a strong case for the effectiveness and safety of interleukin 12 encoding plasmid DNA therapy in treating established metastatic disease, at least in a large animal model.
- The results from this research set the stage for the potential initiation of a clinical trial testing the use of interleukin 12 encoding plasmid DNA therapy for melanoma treatment in humans.
Cite This Article
Publication
Researcher Affiliations
- Institute of Medical Virology, University of Zurich, Switzerland.
MeSH Terms
- Aging
- Animals
- Cell Division
- Disease Models, Animal
- Female
- Genetic Therapy
- Horses / genetics
- Humans
- Immunohistochemistry
- Immunotherapy
- Interferon-gamma / genetics
- Interleukin-12 / adverse effects
- Interleukin-12 / genetics
- Interleukin-12 / immunology
- Interleukin-12 / therapeutic use
- Male
- Melanoma / genetics
- Melanoma / immunology
- Melanoma / pathology
- Melanoma / therapy
- Neoplasm Metastasis / genetics
- Neoplasm Metastasis / immunology
- Neoplasm Metastasis / pathology
- Neoplasm Metastasis / therapy
- Plasmids / administration & dosage
- Plasmids / adverse effects
- Plasmids / genetics
- RNA, Messenger / genetics
- RNA, Messenger / metabolism
- Treatment Outcome
- Tumor Cells, Cultured
Citations
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