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The Nobel Prize in medical science has been granted for revolutionary discoveries that illuminate how the body's defense network targets dangerous pathogens while sparing the body's own cells.

A trio of esteemed scientists—Japan's Shimon Sakaguchi and US scientists Mary Brunkow and Dr. Ramsdell—share this accolade.

Their work identified specialized "sentinels" within the immune system that eliminate malfunctioning defense cells capable of harming the body.

These findings are now enabling new therapies for autoimmune diseases and cancer.

These laureates will divide a monetary award valued at 11 million SEK.

Crucial Discoveries

"The work has been essential for comprehending how the immune system functions and the reason we don't all develop serious self-attack conditions," commented the chair of the award panel.

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

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

Such cells utilize sensors—called recognition units—that are generated by chance in countless combinations.

That provides the defense network the capacity to combat a wide array of threats, but the randomness of the mechanism unavoidably creates white blood cells that may target the body.

Security Guards of the Body

Scientists previously understood that some of these problematic white blood cells were destroyed in the immune organ—where immune cells develop.

The latest award recognizes the discovery of regulatory T-cells—described as the body's "peacekeepers"—which travel through the body to neutralize any defenders that attack the healthy cells.

It is known that this process malfunctions in autoimmune diseases such as type-1 diabetes, MS, and rheumatoid arthritis.

The prize committee added, "These discoveries have laid the foundation for a new field of research and spurred the development of innovative treatments, for instance for cancer and autoimmune diseases."

In cancer, T-regs prevent the body from attacking the growth, so research are aimed at lowering their quantity.

In autoimmune diseases, experiments are testing increasing T-reg cells so the body is not under attack. A similar approach could also be useful in reducing the chances of transplanted organ failure.

Pioneering Studies

Professor Sakaguchi, from Osaka University, conducted tests on mice that had their thymus removed, leading to self-attack conditions.

He demonstrated that injecting defense cells from healthy animals could prevent the illness—suggesting there was a mechanism for blocking immune cells from harming the body.

Mary Brunkow, affiliated with the Institute for Systems Biology in a US city, and Fred Ramsdell, currently at Sonoma Biotherapeutics in San Francisco, were investigating an genetic immune disorder in rodents and humans that led to the discovery of a gene critical for the way T-regs function.

"Their groundbreaking work has revealed how the immune system is kept in check by T-reg cells, preventing it from accidentally attacking the healthy cells," said a prominent physiology expert.

"The work is a striking illustration of how fundamental physiological study can have broad implications for human health."