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Updated: May 15, 2026

Using the BLT Humanized Mouse as a Stem Cell based Gene Therapy Tumor Model

Using the BLT Humanized Mouse as a Stem Cell based Gene Therapy Tumor Model

Published on: December 18, 2012

Using the BLT humanized mouse as a stem cell based gene therapy tumor model.

Dimitrios N Vatakis¹, Gregory C Bristol, Sohn G Kim

¹Department of Medicine, Division of Hematology-Oncology, David Geffen School of Medicine at UCLA. dvatakis@ucla.edu

Journal of Visualized Experiments : Jove

|December 29, 2012

Summary

This study details a novel humanized mouse model for studying human diseases and therapies. The model enables the assessment of genetically modified cytotoxic T cells for melanoma treatment using live positron emission tomography imaging.

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Area of Science:

Immunology
Transplantation Biology
Medical Imaging

Background:

Small animal models are crucial for disease research but have limitations due to species-specific immunity.
Humanized mouse models, including SCID-hu and BLT models, were developed to overcome these limitations for studying human diseases like HIV.
Previous models lacked stable peripheral human immune cell reconstitution, necessitating improved models for physiological relevance.

Purpose of the Study:

To describe the generation of a modified humanized mouse model using genetically modified human hematopoietic stem cells.
To detail the assessment of functional cytotoxic T cells (CTLs) engineered to target melanoma.
To outline the use of live positron emission tomography (PET) imaging for evaluating in vivo therapeutic efficacy.

Main Methods:

Development of a modified BLT (bone marrow/liver/thymus) humanized mouse model using NOD.Cg-Prkdcscid Il2rgtm1Wjl/SzJ (NSG) mice.
Generation of genetically modified human hematopoietic stem cells (hHSC) for thymic/liver implants and autologous transplantation.
Assessment of transgenic CTL functionality and tumor regression in vivo using live PET imaging.

Main Results:

Successful generation of genetically modified lineages within the humanized mouse model.
Demonstration of functional cytotoxic T cells (CTLs) expressing a melanoma-specific T cell receptor.
Validation of live PET imaging as a method to assess tumor regression in vivo.

Conclusions:

The modified humanized mouse model provides a robust platform for studying human immune system reconstitution and function.
This model enables the evaluation of engineered T cell therapies, such as those targeting melanoma.
Live PET imaging offers a powerful tool for non-invasive assessment of therapeutic responses in vivo.