Scientists from Stanford University advanced an old concept to develop a new strategy to train the immune system of mice to recognize cancer cells.
This study is based on the recent understanding that induced pluripotent stem cells (iPSCs), which are stem cells generated from skin or blood cells through a method called reprogramming, produce a large set of antigens that overlap with a specific type of pancreatic cancer.
Vaccines can be highly effective in preventing infections by training the immune system to recognize agents foreign to the body, such as viruses, and eliminate them.
Vaccines trigger the immune system by presenting so-called antigens, such as proteins not normally present in the body, which are then recognized as foreign by the immune system and therefore trigger an immune response.
Less known, and still in the early stages, are vaccines against cancer. Tumor cells often contain unique antigens that are rare or not found in other tissues of the body and, like antigens from a virus, can be targeted for the immune system.
To date, it has been a challenge to develop an effective and durable (lasting) vaccine against tumors.
In this study, researchers capitalized on the knowledge that iPSCs produce antigens that are also found in different types of tumors, but not present in most normal tissue.
They then vaccinated mice with the iPSCs that were treated with irradiation, so that they would not divide, and a CpG adjuvant to stimulate a robust immune response.
They hoped to train the mice’s immune systems to mount a response against the iPSCs, or any type of cell with a similar antigen makeup, including cancer cells.
The results of the study are insightful. The iPSC vaccination protected 75% of mice subsequently injected with pancreatic cancer cells from developing tumors.
Further, vaccination increased the number of tumor-targeting immune cells, and the vaccinated mice developed antibodies against the cancer cells.
What’s more, this strategy may also work for other cancer types with similar antigen makeup to iPSCs.
The team says further studies need to test if iPSC cancer vaccines are safe and effective in patients, both in preventing tumor growth or re-growth and in eliminating established tumors.
If you care about cancer, please read studies about a new method to treat cancer effectively, and this low-dose, four-drug combo may block cancer spread.
For more information about cancer prevention, please see recent studies about nutrient in fish that can be a poison for cancer, and results showing this daily vitamin is critical to cancer prevention.
The research was published in Stem Cell Reports and conducted by Joseph Wu et al.
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