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The Nobel Prize in medical science was granted for transformative findings that illuminate how the body's defense network targets dangerous pathogens while sparing the body's own cells.

Three renowned scientists—Japan's Prof. Sakaguchi and American scientists Mary Brunkow and Dr. Ramsdell—received this accolade.

Their work identified unique "security guards" within the defense system that remove malfunctioning defense cells capable of attacking the organism.

These findings are now paving the way for new therapies for autoimmune diseases and malignancies.

The laureates will share a monetary award worth 11 million Swedish kronor.

Crucial Findings

"The research has been essential for understanding how the immune system operates and why we do not all develop serious autoimmune diseases," stated the chair of the award panel.

The team's research address a fundamental mystery: In what way does the defense system defend us from countless invaders while leaving our own tissues intact?

The immune system uses white blood cells that search for indicators of infection, including pathogens and germs it has never encountered.

Such cells utilize sensors—known as recognition units—that are generated by chance in a vast number of combinations.

That provides the defense network the capacity to fight a broad range of threats, but the randomness of the process unavoidably creates immune cells that may target the host.

Security Guards of the Body

Scientists previously knew that some of these problematic defense cells were eliminated in the immune organ—where white blood cells develop.

The latest award honors the identification of T-reg cells—described as the immune system's "security guards"—which patrol the system to neutralize other immune cells that attack the healthy cells.

We know that this mechanism malfunctions in autoimmune diseases such as type-1 diabetes, MS, and RA.

The prize committee stated, "These discoveries have laid the foundation for a novel area of research and spurred the development of new therapies, for instance for cancer and autoimmune diseases."

Regarding malignancies, T-regs prevent the system from attacking the growth, so studies are focused on lowering their quantity.

For autoimmune diseases, experiments are exploring increasing T-reg cells so the organism is no longer being harmed. A comparable approach could also be useful in reducing the chances of organ transplant failure.

Pioneering Experiments

Professor Sakaguchi, from a Japanese institution, performed tests on mice that had their immune gland removed, leading to self-attack conditions.

The researcher showed that introducing immune cells from other mice could prevent the disease—implying there was a system for preventing immune cells from attacking the body.

Mary Brunkow, affiliated with the a research center in a US city, and Dr. Ramsdell, now at a biotech firm in San Francisco, were studying an inherited immune disorder in rodents and people that resulted in the identification of a genetic factor critical for how regulatory T-cells function.

"The pioneering research has revealed how the body's defenses is kept in check by T-reg cells, preventing it from mistakenly attacking the body's own tissues," commented a prominent biological science specialist.

"The research is a remarkable illustration of how basic biological research can have broad consequences for public health."