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This year's prestigious award in medical science was awarded for transformative discoveries that illuminate how the body's defense network attacks dangerous infections while sparing the body's own cells.

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

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

These discoveries are now enabling innovative treatments for autoimmune diseases and malignancies.

The laureates will share a prize fund worth 11m SEK.

Decisive Findings

"Their work has been decisive for comprehending how the body's defenses functions and why we do not all develop serious autoimmune diseases," stated the chair of the Nobel Committee.

This trio's research address a fundamental question: In what way does the immune system protect us from numerous infections while leaving our own tissues intact?

Our body's protection system employs immune cells that scan for signs of infection, including pathogens and germs it has never encountered.

Such cells utilize sensors—called receptors—that are generated by chance in countless variations.

That gives the immune system the ability to fight a wide array of invaders, but the unpredictability of the process inevitably creates immune cells that may attack the body.

Security Guards of the Body

Scientists previously understood that a portion of these harmful white blood cells were destroyed in the thymus—the site where white blood cells mature.

The latest award recognizes the discovery of regulatory T-cells—described as the immune system's "peacekeepers"—which patrol the body to neutralize other immune cells that attack the body's own tissues.

It is known that this process fails in self-attack conditions such as juvenile diabetes, multiple sclerosis, and RA.

A prize committee added, "These findings have established a new field of investigation and accelerated the development of new treatments, for instance for tumors and autoimmune diseases."

In malignancies, T-regs block the system from attacking the growth, so studies are aimed at reducing their quantity.

In self-attack disorders, trials are testing boosting regulatory T-cells so the body is not under attack. A similar approach could also be useful in minimizing the chances of organ transplant failure.

Innovative Studies

Professor Shimon Sakaguchi, from Osaka University, conducted experiments on mice that had their immune gland removed, causing self-attack conditions.

The researcher showed that injecting defense cells from healthy animals could prevent the disease—suggesting there was a mechanism for preventing immune cells from attacking the body.

Mary Brunkow, from the a research center in a US city, and Dr. Ramsdell, currently at Sonoma Biotherapeutics in a California city, were studying an genetic autoimmune disease in rodents and people that resulted in the discovery of a gene vital for the way T-regs operate.

"Their pioneering work has uncovered how the body's defenses is controlled by regulatory T cells, stopping it from mistakenly targeting the healthy cells," said a prominent biological science specialist.

"The work is a striking illustration of how fundamental biological research can have far-reaching implications for public health."