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Testing Cancer Immunotherapeutics in a Humanized Mouse Model Bearing Human Tumors

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Techniques to study chimerism at the tissue level in humanized mice.

Arin Cox¹, Esha Banerjee¹, Jillian Verrelle¹

¹Penn Vet Comparative Pathology Core, University of Pennsylvania, Philadelphia, PA.

Veterinary Pathology

|November 21, 2025

Summary

This study validates labeling techniques to distinguish human and mouse cells in chimeric mice, crucial for understanding disease models. The methods help researchers identify specific cell types, improving the interpretation of humanized mouse studies.

Keywords:

chimeric mice humanized mice immunohistochemistry mouse models xenografts

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Area of Science:

Immunology
Pathology
Biotechnology

Background:

Chimeric mice are vital for studying human diseases and therapies.
Differentiating human and mouse cells in these models is essential for accurate data interpretation.
Existing methods may lack specificity or broad applicability for complex chimeric tissues.

Purpose of the Study:

To validate and apply a suite of labeling techniques for distinguishing human and mouse cells in chimeric mice.
To provide a reference for identifying specific human and mouse cell subsets, including immune cells and CAR T-cells.
To enhance the spatial resolution and interpretation of studies using humanized mouse models.

Main Methods:

Established broad immunohistochemical markers (HLA-A, Ku80, hMito) for general human cell identification in formalin-fixed paraffin-embedded samples.
Developed tailored immunohistochemistry and in situ hybridization for specific human or mouse immune cell subsets.
Utilized human tissue microarrays and humanized mouse specimens for validation.

Main Results:

HLA-A demonstrated reliable membranous immunoreactivity for human cell identification.
Ku80 and hMito serve as alternative markers when HLA-A is not expressed.
Validated methods allow for differentiation of specific immune cells and human chimeric antigen receptor T-cells within chimeric tissues.

Conclusions:

The validated labeling techniques provide a robust framework for analyzing chimeric mouse models.
These methods are critical for pathologists and researchers studying humanized mice.
The study offers practical applications for diagnostic and experimental use in complex chimeric tissue analysis.