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This year's Nobel Prize in medical science has been awarded for transformative discoveries that illuminate how the body's defense network targets dangerous infections while sparing the body's own cells.

Three esteemed researchers—from Japan Prof. Sakaguchi and US experts Mary Brunkow and Dr. Ramsdell—received this honor.

The work uncovered specialized "sentinels" within the defense system that remove rogue defense cells capable of harming the organism.

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

The laureates will share a monetary award valued at 11m SEK.

Decisive Discoveries

"The work has been essential for comprehending how the body's defenses operates and why we don't all suffer from severe self-attack conditions," stated the head of the Nobel Committee.

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

Our body's protection system uses immune cells that scan for signs of disease, including viruses and germs it has not met before.

These defenders employ detectors—known as recognition units—that are generated randomly in a vast number of combinations.

This gives the defense network the capacity to fight a broad range of threats, but the randomness of the process inevitably produces white blood cells that can attack the body.

Security Guards of the Immune System

Researchers previously knew that a portion of these harmful defense cells were eliminated in the thymus—where immune cells develop.

This year's award honors the identification of T-reg cells—described as the immune system's "peacekeepers"—which patrol the system to neutralize other defenders that assault the body's own tissues.

It is known that this mechanism malfunctions in self-attack conditions such as type-1 diabetes, multiple sclerosis, and RA.

The Nobel panel added, "The discoveries have laid the foundation for a new field of investigation and spurred the creation of innovative therapies, for instance for tumors and autoimmune diseases."

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

In self-attack disorders, experiments are exploring increasing T-reg cells so the body is no longer under attack. A comparable method could also be useful in reducing the chances of organ transplant rejection.

Pioneering Experiments

Prof Sakaguchi, from Osaka University, performed experiments on mice that had their thymus extracted, leading to self-attack conditions.

The researcher demonstrated that introducing immune cells from healthy animals could stop the disease—suggesting there was a mechanism for blocking defenders from attacking the host.

Dr. Brunkow, from the Institute for Systems Biology in a US city, and Dr. Ramsdell, now at Sonoma Biotherapeutics in San Francisco, were studying an inherited immune disorder in rodents and people that led to the discovery of a genetic factor critical for how T-regs operate.

"Their groundbreaking work has uncovered how the body's defenses is controlled by regulatory T cells, stopping it from mistakenly attacking the body's own tissues," commented a leading biological science specialist.

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