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Cytotoxic T cells are a vital component of the immune system. They have the remarkable ability to identify and target antigens on infected or abnormal cells. These antigens often originate from intracellular pathogens such as viruses or abnormal proteins cancer cells produce.
Immunological surveillance is the ability of immune cells to monitor and eliminate infected cells with intracellular pathogens, neoplastically transformed cells, and cells with non-self antigens. Cytotoxic T cells and NK...
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A Nonviral Approach to Generate Transient Chimeric Antigen Receptor T Cells Using mRNA for Cancer Immunotherapy
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Primary T cells for mRNA-mediated immunotoxin delivery.

R Eggers1, A Philippi1, M O Altmeyer1

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Human T cells can deliver cancer-fighting immunotoxins via messenger RNA (mRNA) transfection. This approach shows potential for targeted cancer therapy with reduced side effects.

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Area of Science:

  • Immunology
  • Cancer Therapy
  • Molecular Biology

Background:

  • Chimeric protein toxins are used in cancer therapy but have severe side effects.
  • Immune cells are being explored as targeted delivery systems for these toxins.

Purpose of the Study:

  • To investigate the use of human primary T cells for delivering immunotoxins via mRNA transfection.
  • To develop and optimize protocols for transient mRNA transfection in T cells and HEK293 cells.

Main Methods:

  • Constructed chimeric immunotoxins targeting cancer neovasculature (VEGF-PE38, VEGF-PE38D).
  • Established transient mRNA transfection protocols for HEK293 cells and primary human T cells.
  • Analyzed immunotoxin expression, secretion, and translocation using mass spectrometry.
  • Assessed cytotoxic activity of T cells secreting immunotoxins in co-culture models.

Main Results:

  • Efficient expression and secretion of immunotoxins (e23-PE38, VEGF-PE38, VEGF-PE38D) were achieved through mRNA transfection.
  • Mass spectrometry confirmed proper endoplasmic reticulum translocation of VEGF-PE38D.
  • Immunotoxin-secreting T cells demonstrated cytotoxic activity against ovarian cancer cells in the presence of a bispecific antibody.

Conclusions:

  • Primary human T cells can be effectively engineered via mRNA transfection to secrete functional immunotoxins.
  • This mRNA-mediated delivery system shows promise for targeted cancer therapy, potentially reducing systemic toxicity.