Personalized Immune Mouse Model Offers New Way to Research Autoimmune Diseases

A newly created mouse model may allow development of customized immunotherapies against cancer and infection.

Columbia University Medical Center (CUMC; New York, NY, USA) scientists have developed a way to recreate an individual’s immune system in a mouse. The “personalized immune mouse” provides researchers with an extraordinary tool for individualized analysis of abnormalities that contribute to type 1 diabetes and other autoimmune disorders, beginning at the onset of disease. The study’s findings were published March 14, 2012, in the online edition of the journal Science Translational Medicine.

The mouse model could also have clinical applications, such as predicting how a specific patient might respond to existing drugs or immunotherapies, reports senior author Megan Sykes, a professor of medicine and professor of microbiology and immunology and Surgical Sciences (in surgery) at CUMC. Dr. Sykes is also director for the Columbia Center for Translational Immunology.

Moreover, the model might be useful for developing individualized immunotherapies for combating infection or cancer or for lessening a patient's rejection of transplanted tissue.

Researchers have been searching for new ways to tease apart the various factors that contribute to autoimmune disease. “While large-scale studies of human populations have provided important clues to the genetic basis of immune diseases, they have offered little information about the specific role the genes play,” said Dr. Sykes. “It’s difficult to isolate these mechanisms when looking at groups of patients who have had disease for different lengths of time or have been receiving different treatments. And the fact that they already have the disease makes it difficult to distinguish what underlies and propagates the autoimmune process.”

Several research groups have attempted to create a personalized immune mouse. However, each model has had significant limitations, such as an inability to generate the full complement of immune cells and incompatibilities between tissues used to recreate the human immune system, leading to graft-versus-host disease.

Dr. Sykes’ model, in contrast, is able to recreate a healthy and diverse human immune system, including T cells, B cells, and myeloid cells (which generate a variety of immune cells), free of immune incompatibilities.

The model was created by transplanting human bone marrow stem cells (also known as CD34+ cells), along with a small amount (about 1 cubic mm) of human leukocyte antigen- (HLA)-matched immature thymus tissue, into an immunodeficient mouse. (The HLA system mediates interactions among various immune cells.) The thymus tissue is implanted into the mouse’s kidney capsule, a thin membrane that envelops the kidney and serves as an incubator. Within six to eight weeks, the transplanted thymus tissue is seeded by circulating human CD34+ cells (which are infused into the bloodstream of the mouse), and begins generating human immune cells from the CD34+ cells.

A key to the model’s effectiveness was the investigators’ finding that freezing and thawing the transplanted thymus tissue, as well as administering antibodies against CD2 (a glycoprotein that mediates T cell development and activation), depletes mature T cells from the tissue graft. This prevents rejection of the human CD34+ cells and graft-versus-host disease, while maintaining function of the thymus tissue.

Dr. Sykes plans to use the personalized immune mouse to study type 1 diabetes. “We hope to find out what is fundamentally different about patients’ immune systems, compared with those of healthy individuals, before any disease develops,” she said.

The studies should also clarify more about the genetics of type 1 diabetes. “A number of HLA-associated genes have been linked to type 1 diabetes,” she explained. “About a third of the population has one of more of these genes. But a much smaller percentage of the population actually develops the disease. What this means is, the HLA genes are necessary, but not sufficient, to cause type 1 diabetes. Using the personalized immune mouse, we expect to learn more about the role that non-HLA genes play in the disease.”

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