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The Nobel Prize in medical science has been granted for revolutionary findings that clarify how the body's defense network attacks dangerous infections while sparing the body's own cells.

Three esteemed scientists—from Japan Shimon Sakaguchi and American experts Dr. Brunkow and Dr. Ramsdell—received this honor.

Their research identified unique "sentinels" within the defense system that remove malfunctioning immune cells that could harming the body.

The findings are now paving the way for new therapies for immune disorders and cancer.

These winners will divide a prize fund worth 11m SEK.

Crucial Findings

"Their research has been essential for understanding how the body's defenses operates and why we don't all suffer from serious self-attack conditions," commented the chair of the Nobel Committee.

This trio's research address a fundamental mystery: In what way does the defense system protect us from countless invaders while leaving our own tissues unharmed?

The body's protection system employs white blood cells that search for signs of infection, even pathogens and bacteria it has never encountered.

These cells employ detectors—called recognition units—that are generated randomly in countless variations.

That provides the defense network the capacity to combat a broad range of invaders, but the unpredictability of the process unavoidably creates immune cells that may target the body.

Security Guards of the Body

Researchers previously understood that some of these problematic defense cells were eliminated in the immune organ—the site where immune cells mature.

The latest award honors the discovery of T-reg cells—described as the immune system's "security guards"—which patrol the system to disarm other defenders that attack the body's own tissues.

It is known that this process malfunctions in autoimmune diseases such as type-1 diabetes, multiple sclerosis, and rheumatoid arthritis.

A Nobel panel added, "These findings have laid the foundation for a new field of research and accelerated the creation of new treatments, for instance for cancer and autoimmune diseases."

Regarding malignancies, regulatory T-cells prevent the body from attacking the growth, so research are aimed at lowering their quantity.

For self-attack disorders, trials are exploring boosting T-reg cells so the body is no longer under attack. A comparable approach could also be useful in reducing the risks of organ transplant rejection.

Innovative Studies

Prof Shimon Sakaguchi, of a Japanese institution, performed experiments on mice that had their thymus removed, leading to autoimmune disease.

The researcher demonstrated that introducing defense cells from other animals could prevent the illness—implying there was a system for blocking immune cells from harming the body.

Mary Brunkow, from the a research center in a US city, and Dr. Ramsdell, currently at a biotech firm in a California city, were studying an genetic autoimmune disease in rodents and people that resulted in the identification of a genetic factor vital for the way T-regs function.

"The groundbreaking research has revealed how the immune system is kept in check by regulatory T cells, stopping it from mistakenly targeting the healthy cells," commented a prominent physiology specialist.

"This research is a striking example of how fundamental physiological study can have far-reaching consequences for public health."