Current humanized mouse models for studying human immunology and HIV-1 immuno-pathogenesis

Area of Science:

• Immunology
• Infectious Diseases
• Animal Models

Background:

• Robust animal models are essential for human immunology and immuno-pathology research.
• Existing human-mouse chimeric models have shown limited success due to engraftment issues or weak immune responses.
• Human pathogens like HIV-1 often fail to infect standard mouse models.

Purpose of the Study:

• To review the current understanding of HIV-1 immunopathogenesis.
• To summarize progress in developing humanized mouse models with functional human immune systems.
• To highlight the utility of these models for studying human immunology and infectious diseases.

Main Methods:

• Review of existing literature on humanized mouse models and HIV-1 pathogenesis.
• Focus on immunodeficient mice with defective gammaC genes (NOG/NSG, DKO mice).
• Utilizing human CD34(+) hematopoietic stem cells (HSCs) for immune system reconstitution.

Main Results:

• NOD/SCID/gammaC(-/-) (NOG/NSG) and Rag2(-/-)gammaC(-/-) (DKO) mice can be reconstituted with a functional human immune system.
• These "non-obese diabetic" (NOD)/"severe combined immunodeficiency" (SCID)/"gammaC-deficient" (gammaC(-/-)) HSC models support HIV-1 infection and pathogenesis studies.
• Humanized mouse models enable investigation of therapeutic interventions for HIV-1.

Conclusions:

• Humanized mouse models, particularly NTB-hu HSC models, are valuable tools for studying human immunology and HIV-1.
• Further improvements in these models will enhance their utility for research on human-tropic pathogens and stem cell biology.
• These models offer a promising platform for hypothesis-testing and mechanistic research in human diseases.