HIV Replication in Humanized IL-3/GM-CSF-Transgenic NOG Mice

Area of Science:

• Immunology
• Virology
• Preclinical models

Background:

• Developing accurate mouse models for Human Immunodeficiency Virus (HIV) infection is crucial for understanding disease progression and therapeutic development.
• Existing humanized mouse models require enhancement to fully recapitulate HIV infection kinetics.

Purpose of the Study:

• To characterize HIV infection dynamics in a novel humanized mouse model, NOG-EXL, engineered with human interleukin (IL)-3 and granulocyte-macrophage colony-stimulating factor (GM-CSF) genes.
• To compare the engraftment efficiency and HIV infection profile of NOG-EXL mice with non-transgenic humanized NSG mice.

Main Methods:

• Humanized NOD/Shi-scid-IL2rγnull (NOG) mice were genetically modified to express human IL-3 and GM-CSF (NOG-EXL mice).
• Mice were infected with HIV, and viral load, T-cells, B-cells, NK cells, monocytes, and dendritic cell frequencies were monitored in blood and lymphoid tissues.
• Cellular populations and viral kinetics were compared between NOG-EXL and NSG mice.

Main Results:

• NOG-EXL mice demonstrated superior engraftment of lymphoid and myeloid populations compared to NSG mice.
• HIV actively replicated in NOG-EXL mice, leading to a decrease in CD4+ T-cells and an inverted CD4:CD8 ratio.
• Observed changes in monocytes and dendritic cells mirrored those seen in human HIV infection.

Conclusions:

• The humanized IL-3/GM-CSF-transgenic NOG mouse model (NOG-EXL) accurately recapitulates key aspects of HIV infection dynamics.
• This model serves as a valuable tool for basic research into HIV pathogenesis and for preclinical evaluation of therapeutic strategies.