In the realm of biomedical research, humanized mice have emerged as invaluable tools for studying human diseases and therapeutic interventions. These genetically modified mice possess functional human immune systems, making them uniquely suited for investigating human-specific immune responses and evaluating the efficacy of potential treatments. This article aims to explore the concept of humanized mice, focusing on humanized transgenic mice and their subsets, such as CD34 humanized mice and PBMC humanized mice, and their significant contributions to advancing scientific knowledge and medical discoveries.

Understanding Humanized Mice

Humanized mice refer to genetically modified mouse models that have been engineered to harbor components of the human immune system. These mice provide a platform for studying human immune responses, infectious diseases, cancer, autoimmune disorders, and the evaluation of immunotherapies.

Humanized Transgenic Mice

Humanized transgenic mice are created by introducing human genes or cells into the mouse genome. This genetic modification allows the mice to develop a functional human immune system. Two common approaches for generating humanized transgenic mice involve the engraftment of human hematopoietic stem cells (HSCs) or the transfer of human peripheral blood mononuclear cells (PBMCs) into immunodeficient mice.

CD34 Humanized Mice

CD34 humanized mice are generated by engrafting human CD34+ hematopoietic stem and progenitor cells into immunodeficient mice. CD34+ cells are isolated from various sources, such as umbilical cord blood or bone marrow, and are then injected into the mouse model. These cells have the potential to differentiate into various immune cell types, allowing the development of a human immune system within the mouse.

PBMC Humanized Mice

PBMC humanized mice involve the transfer of human peripheral blood mononuclear cells (PBMCs) into immunodeficient mice. PBMCs, derived from human blood samples, contain immune cells such as T cells, B cells, and natural killer (NK) cells. These cells are injected into the mouse model, leading to the development of a partially humanized immune system.


Applications and Significance

Humanized mice offer unique opportunities to study human-specific diseases and immune responses, which cannot be fully replicated in traditional mouse models. They have become invaluable tools for numerous biomedical research areas, including:

Infectious Disease Research

Humanized mice allow the study of human-specific pathogens and the evaluation of vaccines and antiviral therapies. They have been instrumental in understanding the mechanisms of HIV/AIDS, hepatitis, and other viral infections.

Cancer Research and Immunotherapy

Humanized mice provide a platform for studying tumor development, immune responses, and the evaluation of novel cancer treatments. They have played a crucial role in the development and testing of monoclonal antibody therapies, CAR-T cell therapies, and immune checkpoint inhibitors.


Autoimmune Disease Modeling

Humanized mice enable the investigation of human-specific autoimmune diseases, such as rheumatoid arthritis, multiple sclerosis, and lupus. They help unravel the underlying mechanisms and test potential therapeutic interventions.

Drug Development and Safety Assessment

Humanized mice aid in the preclinical evaluation of drug candidates, assessing their efficacy, toxicity, and potential side effects in a humanized immune system. This approach can streamline the drug development process and reduce the reliance on animal testing.



Humanized mice have revolutionized biomedical research by bridging the gap between human and animal studies. These genetically modified mouse models, including CD34 humanized mice and PBMC humanized mice, provide a unique platform to investigate human diseases, immune responses, and therapeutic interventions. They have significantly contributed to our understanding of human-specific diseases and the development of novel treatment strategies. As scientific advancements continue, humanized mice will remain invaluable tools for advancing medical knowledge, accelerating drug development, and ultimately improving patient outcomes in diverse fields of research.