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Related Experiment Video

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Generation of Induced Regulatory T Cells from Primary Human Na&#239;ve and Memory T Cells
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Building tolerance: employing genome engineering toward universal Treg therapy.

Julian J Freen-van Heeren1

  • 1Independent Scientist, The Netherlands.

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Scientists engineered regulatory T cells (Tregs) to evade immune rejection, creating "off-the-shelf" cell therapies. These modified Tregs show promise for inducing immune tolerance in future medical applications.

Keywords:
CRISPRcellular therapyregulatory T cells

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Area of Science:

  • Immunology
  • Cell Biology
  • Genetic Engineering

Background:

  • Regulatory T cells (Tregs) are crucial for immune homeostasis and preventing autoimmune diseases.
  • The development of universal, allogeneic Treg therapies is hindered by immune rejection.
  • Genome editing offers a potential solution to overcome Treg immunogenicity.

Purpose of the Study:

  • To engineer genome-edited Tregs that evade immune rejection while maintaining suppressive function.
  • To assess the efficacy of these modified Tregs in promoting graft tolerance.
  • To discuss the potential and challenges of universal "off-the-shelf" Treg therapies.

Main Methods:

  • Non-viral CRISPR-Cas9 genome editing was used to modify Tregs.
  • Key genes (B2M, CIITA) were deleted, and an HLA-E-B2M fusion was inserted.
  • Hypo-immunogenic Tregs were generated and tested in humanized mouse models.

Main Results:

  • Genome-edited Tregs demonstrated reduced immunogenicity.
  • Modified Tregs persisted and promoted graft tolerance in humanized mice.
  • The engineered Tregs retained their immune suppressive function.

Conclusions:

  • Genome engineering can create hypo-immunogenic Tregs for universal therapeutic use.
  • These "off-the-shelf" Tregs represent a significant advancement in programmable immune tolerance.
  • Further research is needed to address challenges for clinical translation.