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Long-Term Human Immune Reconstitution, T-Cell Development, and Immune Reactivity in Mice Lacking the Murine Major
Milita Darguzyte1,2, Philipp Antczak3,4, Daniel Bachurski2,5
1Institute for Translational Immune-Oncology, Cancer Research Center Cologne-Essen (CCCE), Faculty of Medicine and University Hospital Cologne, University of Cologne, 50931 Cologne, Germany.
Cells
|October 25, 2024
Summary
Human T-cell development in mice does not require mouse MHCs. This study shows that humanized mice lacking mouse MHCs are a promising model for studying human immune responses and therapies.
Area of Science:
- Immunology
- Transplantation Biology
- Infectious Disease Research
Background:
- Humanized mice are crucial for studying human immune responses and pre-clinical therapy testing.
- The necessity of mouse MHCs or human HLAs for human T-cell development in these models was previously unknown.
Purpose of the Study:
- To assess long-term human hematopoiesis and T-cell development in mice lacking MHC class I and II expression (NSG-DKO).
- To evaluate the response of humanized NSG-DKO mice to lentiviral vector (LV) delivery of specific human antigens and cytokines.
Main Methods:
- Transplantation of CD34+ hematopoietic progenitor cells (HPCs) into NSG-DKO mice.
- Long-term monitoring of human hematopoiesis and T-cell development (20 weeks).
- Systemic LV delivery of HLA-A*02:01, HLA-DRB1*04:01, GM-CSF/IFN-α, and CMV gB antigen.
Main Results:
- Detectable human immune reconstitution and T-cell populations (CD4+, CD8+) in peripheral blood and lymphatic tissues.
- LV delivery successfully induced lymphocyte subsets and HLA-DR expression in bone marrow.
- RNA sequencing revealed enhanced expression of human reactome pathways related to host defense.
Conclusions:
- Human T-cell development and reactivity are independent of murine MHC expression.
- Humanized NSG-DKO mice offer a valuable model for studying human immunity by eliminating mouse MHC interference.
