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The prestigious award in medical science has been granted for transformative discoveries that illuminate how the immune system attacks harmful infections while protecting the body's own cells.

Three renowned scientists—from Japan Prof. Sakaguchi and American experts Dr. Brunkow and Fred Ramsdell—received this honor.

The work identified specialized "security guards" within the immune system that eliminate malfunctioning immune cells capable of attacking the organism.

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

The winners will divide a monetary award worth 11 million SEK.

Decisive Findings

"Their research has been decisive for comprehending how the body's defenses operates and why we do not all suffer from serious self-attack conditions," commented the head of the Nobel Committee.

The trio's studies explain a fundamental mystery: In what way does the immune system defend us from numerous invaders while keeping our own tissues intact?

Our body's protection system uses white blood cells that scan for signs of disease, even viruses and bacteria it has not met before.

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

That provides the defense network the capacity to combat a wide array of threats, but the randomness of the process inevitably creates immune cells that may target the body.

Protectors of the Immune System

Scientists previously understood that some of these harmful white blood cells were destroyed in the immune organ—the site where white blood cells mature.

The latest Nobel Prize recognizes the identification of regulatory T-cells—described as the body's "peacekeepers"—which patrol the body to disarm any defenders that assault the healthy cells.

It is known that this process fails in autoimmune diseases such as type-1 diabetes, MS, and RA.

The prize committee stated, "These discoveries have established a new field of investigation and spurred the creation of innovative therapies, for example for tumors and autoimmune diseases."

In cancer, T-regs block the system from attacking the tumor, so research are focused on reducing their quantity.

For self-attack disorders, trials are testing boosting regulatory T-cells so the organism is no longer under attack. A comparable approach could also be effective in minimizing the chances of organ transplant failure.

Innovative Experiments

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

The researcher demonstrated that injecting defense cells from other animals could prevent the illness—suggesting there was a system for blocking immune cells from harming the host.

Mary Brunkow, from the a research center in a US city, and Fred Ramsdell, now at a biotech firm in a California city, were studying an inherited immune disorder in mice and humans that led to the identification of a genetic factor critical for the way regulatory T-cells operate.

"Their groundbreaking research has uncovered how the body's defenses is kept in check by regulatory T cells, preventing it from accidentally attacking the healthy cells," commented a prominent biological science specialist.

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