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The prestigious award in medical science has been awarded for revolutionary discoveries that illuminate how the body's defense network attacks harmful pathogens while sparing the healthy tissues.

Three esteemed scientists—from Japan Prof. Sakaguchi and US scientists Mary Brunkow and Fred Ramsdell—share this accolade.

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

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

These laureates will share a prize fund valued at 11m Swedish kronor.

Crucial Findings

"Their research has been decisive for comprehending how the immune system functions and the reason we do not all suffer from severe self-attack conditions," commented the chair of the Nobel Committee.

The team's studies address a core question: How does the immune system defend us from countless invaders while leaving our healthy cells unharmed?

Our immune system uses immune cells that scan for indicators of infection, even pathogens and bacteria it has never encountered.

These defenders utilize detectors—known as recognition units—that are produced by chance in countless combinations.

This gives the immune system the capacity to fight a wide array of threats, but the unpredictability of the process unavoidably produces white blood cells that may target the body.

Security Guards of the Body

Scientists previously knew that some of these harmful defense cells were destroyed in the thymus—the site where white blood cells develop.

This year's Nobel Prize honors the discovery of T-reg cells—known as the immune system's "peacekeepers"—which travel through the body to disarm other defenders that assault the body's own tissues.

It is known that this mechanism fails in autoimmune diseases such as juvenile diabetes, MS, and RA.

A Nobel panel added, "The discoveries have laid the foundation for a novel area of investigation and spurred the development of innovative treatments, for example for tumors and autoimmune diseases."

In malignancies, T-regs prevent the body from attacking the tumor, so research are focused on lowering their quantity.

For self-attack disorders, trials are exploring boosting regulatory T-cells so the body is no longer under attack. A similar approach could also be useful in minimizing the chances of organ transplant rejection.

Pioneering Experiments

Prof Sakaguchi, of Osaka University, conducted experiments on mice that had their thymus removed, leading to autoimmune disease.

He showed that introducing defense cells from other mice could prevent the disease—implying there was a system for preventing immune cells from harming the body.

Mary Brunkow, affiliated with the a research center in Seattle, and Dr. Ramsdell, now at Sonoma Biotherapeutics in a California city, were investigating an inherited autoimmune disease in rodents and people that led to the discovery of a genetic factor vital for the way T-regs function.

"Their pioneering research has revealed how the body's defenses is kept in check by regulatory T cells, stopping it from mistakenly attacking the body's own tissues," commented a prominent physiology expert.

"The research is a striking example of how fundamental physiological research can have far-reaching implications for public health."