Engineered immune cells minimize tumors in mice

Maryland, February 11: Researchers have generated altered immune cells that are able to shrink, and in some cases eradicate, large tumors in mice.

The immune cells target mesothelin, a protein that is highly expressed, or translated in large amounts from the mesothelin gene, on the surface of several types of cancerdefine cells. Expression of mesothelin is normally limited to the cells that make up the protective lining (mesothelium) of the body’s cavities and internal organs. The approach was developed by researchers at the National Cancer Institute (NCI) and at the University of Pennsylvania School of Medicine.

"Since tumor cells are derived from the body’s normal cells, the immune systemdefine often does not recognize tumor molecules as dangerous or foreign and does not mount a strong attack against them," said Ira Pastan, M.D., chief of the Laboratory of Molecular Biology in NCI’s Center for Cancer Research, a study collaborator.

Moreover, even though it is possible to genetically engineer immune system cells to recognize molecules on tumor cells, most of the molecules found on tumor cells are also found on normal cells. But, Pastan notes, Mesothelin is a promising candidate for generating tumor-targeting T cells, given its limited expression in normal tissues and high expression in several cancers."

In the study, the research team genetically engineered human T cells to target human mesothelin. To produce them, a modified virus was used as a delivery vehicle, or vector, to transfer synthetic genesdefine to T cells. These genes directed the production of hybrid, or chimeric, proteins that can recognize and bind to mesothelin and consequently stimulate the proliferation and cell-killing activity of the T cells.

In laboratory studies, the team found that the engineered T cells proliferated and secreted multiple cytokines when exposed to mesothelin. Cytokines are proteins that help control immune functions. The cells also expressed proteins that made them resistant to the toxic effects of tumors and their surrounding tissues.
To study the effects of the engineered T cells on tumor tissue, the researchers implanted human mesothelioma cells underneath the skin of mice. About six weeks later, when tumors had formed and progressed to an advanced stage, the engineered T cells were administered to the mice. Direct injection of the T cells into tumors or into veins of the mice resulted in disappearance or shrinkage of the tumor.

"Based on the size of the tumors and the number of cells administered, we estimate that one mesothelin-targeted T cell was able to kill about 40 tumor cells," said study leader Carl H. June, M.D., professor of Pathology and Laboratory Medicine at the University of Pennsylvania School of Medicine and director of Translational Research at Penn's Abramson Cancer Center. "This finding indicates that small doses of these cells may have potential in treating patients with large tumors. Clinical trials are being developed to investigate this approach in patients with mesothelioma and ovarian cancer."

The study is published in the Proceedings of the National Academy of Sciences.