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

A trio of renowned scientists—Japan's Shimon Sakaguchi and American scientists Mary Brunkow and Fred Ramsdell—share this accolade.

The work uncovered unique "sentinels" within the defense system that remove rogue immune cells capable of attacking the body.

The discoveries are now paving the way for innovative treatments for immune disorders and cancer.

These winners will divide a prize fund valued at 11m Swedish kronor.

Decisive Discoveries

"The work has been essential for understanding how the immune system functions and the reason we do not all suffer from severe autoimmune diseases," commented the head of the award panel.

The team's research explain a core mystery: How does the defense system protect us from countless invaders while keeping our own tissues intact?

The body's protection system uses white blood cells that scan for signs of disease, even pathogens and bacteria it has never encountered.

These cells utilize detectors—called recognition units—that are generated by chance in a vast number of combinations.

This gives the defense network the ability to fight a wide array of threats, but the unpredictability of the process unavoidably produces immune cells that can target the host.

Security Guards of the Immune System

Scientists earlier understood that some of these harmful defense cells were destroyed in the thymus—the site where immune cells mature.

This year's Nobel Prize recognizes the identification of T-reg cells—described as the body's "peacekeepers"—which patrol the body to neutralize any defenders that assault the healthy cells.

We know that this process malfunctions in self-attack conditions such as type-1 diabetes, MS, and rheumatoid arthritis.

A prize committee stated, "The discoveries have laid the foundation for a novel area of investigation and accelerated the development of new treatments, for instance for cancer and immune disorders."

In cancer, regulatory T-cells prevent the system from fighting the tumor, so research are aimed at reducing their quantity.

In self-attack disorders, experiments are exploring increasing T-reg cells so the organism is not under attack. A similar method could also be effective in minimizing the risks of transplanted organ failure.

Innovative Experiments

Professor Sakaguchi, from a Japanese institution, conducted experiments on mice that had their immune gland removed, causing self-attack conditions.

He showed that introducing immune cells from other mice could stop the illness—implying there was a mechanism for preventing immune cells from harming the host.

Mary Brunkow, affiliated with the a research center in a US city, and Dr. Ramsdell, currently at Sonoma Biotherapeutics in San Francisco, were investigating an inherited autoimmune disease in rodents and humans that resulted in the identification of a gene vital for how regulatory T-cells function.

"Their groundbreaking work has revealed how the body's defenses is kept in check by regulatory T cells, stopping it from mistakenly attacking the healthy cells," commented a leading physiology specialist.

"The work is a remarkable example of how fundamental physiological study can have broad implications for public health."