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Tumor ablation by gene-modified T cells in the absence of autoimmunity

Leanne X J Wang1, Jennifer A Westwood, Maria Moeller

  • 1Cancer Immunology Program, Peter MacCallum Cancer Centre, East Melbourne, Victoria, Australia.

Cancer Research
|November 25, 2010
PubMed

Insights

Gene-engineered T cells targeting cancer’s Her-2 antigen eradicated tumors in mice without causing autoimmune disease. This adoptive immunotherapy approach shows promise for safe and effective cancer treatment.

Area of Science:

  • Immunology
  • Oncology
  • Genetic Engineering

Background:

  • Adoptive immunotherapy using genetically modified T cells with chimeric antigen receptors (CARs) is a promising cancer treatment.
  • Assessing the safety and efficacy of CAR T cells targeting self-antigens is crucial to prevent autoimmune pathology.

Purpose of the Study:

  • To evaluate the antitumor efficacy of T cells engineered to express an anti-Her-2 chimeric receptor.
  • To determine if this gene-modified T cell therapy can eradicate tumors without inducing autoimmune disease in a relevant preclinical model.

Main Methods:

  • T cells were genetically modified to express an anti-Her-2 chimeric receptor.
  • Adoptive transfer of these modified T cells was performed in Her-2 transgenic mice bearing Her-2(+) tumors.
  • Lymphoablative conditioning and IL-2 administration were used to enhance therapeutic effects.

Main Results:

  • Administration of anti-Her-2 T cells significantly improved survival in mice with Her-2(+) tumors compared to control T cells.
  • Survival was further enhanced by lymphoablative conditioning and IL-2 administration.
  • Transferred T cells localized to the tumor site, mediated tumor growth reduction, and induced antigen-specific recall responses upon rechallenge.
  • Crucially, no autoimmune pathology was observed in normal tissues expressing the Her-2 self-antigen.

Conclusions:

  • Gene-engineered T cells targeting the Her-2 antigen demonstrate potent antitumor activity.
  • This approach offers a potentially safe and effective strategy for cancer treatment, avoiding autoimmune complications.
  • The study supports the therapeutic potential of adoptive immunotherapy with engineered T cells for cancer treatment.

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