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A Humanized Mouse Model Generated Using Surplus Neonatal Tissue.

Matthew E Brown1, Ying Zhou2, Brian E McIntosh3

  • 1Division of Transplantation/Department of Surgery, University of Wisconsin, Madison, WI 53792, USA; Regenerative Biology, Morgridge Institute for Research, Madison, WI 53715, USA.

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Summary
This summary is machine-generated.

A new NeoThy humanized mouse model uses neonatal thymus and stem cells, offering a scalable alternative to fetal tissue. This model supports robust T-cell development and function for research.

Keywords:
NeoThyPSChematopoietic stem cellshumanized mouseiPSCimmunogenicityimmunologyinduced pluripotent stem cellsthymustransplantation

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Area of Science:

  • Immunology
  • Transplantation Biology
  • Stem Cell Research

Background:

  • Conventional humanized mouse models rely on human fetal thymus and hematopoietic stem cells (HSCs).
  • These models are crucial for studying human immune responses in vivo.
  • Fetal tissue availability limits the scale and efficiency of current models.

Purpose of the Study:

  • To develop and characterize a novel humanized mouse model, NeoThy, using non-fetal human tissues.
  • To assess the feasibility of using cryopreserved neonatal thymus and umbilical cord blood HSCs.
  • To compare the NeoThy model with traditional fetal tissue-derived models.

Main Methods:

  • Generation of the NeoThy model by engrafting human neonatal thymus and cryopreserved umbilical cord blood HSCs into immunocompromised mice.
  • Evaluation of immune cell engraftment frequencies.
  • Assessment of T-cell function through ex vivo proliferation assays, interferon-gamma secretion, and in vivo graft infiltration studies.

Main Results:

  • The NeoThy model successfully engrafts functional human immune cells, including T cells.
  • Neonatal thymus provides a more abundant and developmentally mature source, enabling ~50-fold more mice per donor compared to fetal tissue.
  • NeoThy mice exhibit equivalent frequencies of human immune cell engraftment and comparable T-cell function to fetal tissue-derived models.

Conclusions:

  • The NeoThy model presents a scalable and efficient alternative to fetal tissue-based humanized mice.
  • This model supports T-cell maturation and function, mimicking responses seen in conventional models.
  • NeoThy offers advantages for immunogenicity studies, particularly for induced pluripotent stem cells, without requiring fetal tissue.