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The prestigious award in medical science was awarded for transformative discoveries that clarify how the body's defense network targets harmful pathogens while sparing the body's own cells.

Three renowned researchers—Japan's Shimon Sakaguchi and US scientists Mary Brunkow and Dr. Ramsdell—received this accolade.

Their research uncovered specialized "security guards" within the defense system that eliminate malfunctioning immune cells capable of harming the body.

These discoveries are now paving the way for new treatments for immune disorders and malignancies.

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

Decisive Discoveries

"The research has been decisive for comprehending how the body's defenses operates and why we do not all suffer from serious self-attack conditions," stated the head of the award panel.

This team's studies explain a fundamental question: In what way does the immune system defend us from countless invaders while leaving our own tissues unharmed?

The immune system uses immune cells that scan for signs of disease, even viruses and bacteria it has not met before.

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

That provides the immune system the ability to fight a wide array of threats, but the randomness of the mechanism inevitably produces white blood cells that can attack the body.

Security Guards of the Immune System

Researchers earlier understood that some of these harmful defense cells were destroyed in the immune organ—where white blood cells develop.

This year's Nobel Prize honors the identification of regulatory T-cells—known as the immune system's "security guards"—which travel through the system to neutralize any immune cells that attack the body's own tissues.

We know that this process fails in self-attack conditions such as juvenile diabetes, MS, and RA.

The prize committee added, "The discoveries have established a new field of investigation and accelerated the creation of innovative therapies, for example for cancer and immune disorders."

Regarding malignancies, T-regs block the system from fighting the growth, so studies are aimed at lowering their numbers.

For self-attack disorders, trials are exploring increasing regulatory T-cells so the body is not being harmed. A similar method could also be effective in minimizing the chances of organ transplant rejection.

Pioneering Studies

Prof Sakaguchi, from Osaka University, performed experiments on mice that had their immune gland extracted, causing autoimmune disease.

The researcher showed that injecting defense cells from healthy mice could stop the illness—implying there was a mechanism for blocking defenders from attacking the host.

Dr. Brunkow, from the Institute for Systems Biology in a US city, and Fred Ramsdell, now at Sonoma Biotherapeutics in San Francisco, were studying an genetic autoimmune disease in rodents and people that led to the discovery of a genetic factor critical for how regulatory T-cells function.

"The groundbreaking research has uncovered how the body's defenses is controlled by T-reg cells, preventing it from mistakenly targeting the body's own tissues," said a prominent biological science expert.

"This work is a striking illustration of how basic biological research can have far-reaching consequences for human health."