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The prestigious award in medical science has been granted for transformative findings that illuminate how the body's defense network targets dangerous infections while protecting the body's own cells.

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

The research identified unique "sentinels" within the immune system that eliminate rogue defense cells that could attacking the organism.

These findings are now enabling innovative treatments for immune disorders and malignancies.

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

Crucial Discoveries

"The research has been decisive for understanding how the body's defenses functions and why we do not all develop serious autoimmune diseases," stated the chair of the Nobel Committee.

This trio's research explain a core question: In what way does the immune system protect us from countless infections while leaving our healthy cells unharmed?

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

Such defenders utilize sensors—called recognition units—that are generated randomly in a vast number of combinations.

That provides the defense network the capacity to combat a broad range of invaders, but the randomness of the mechanism unavoidably produces immune cells that may attack the host.

Protectors of the Immune System

Scientists previously understood that some of these problematic defense cells were eliminated in the immune organ—where white blood cells mature.

This year's Nobel Prize recognizes the identification of regulatory T-cells—known as the body's "peacekeepers"—which travel through the body to neutralize other immune cells that assault the healthy cells.

We know that this mechanism fails in autoimmune diseases such as juvenile diabetes, MS, and rheumatoid arthritis.

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

Regarding cancer, T-regs block the system from attacking the growth, so research are aimed at lowering their numbers.

In self-attack disorders, experiments are testing boosting T-reg cells so the body is no longer being harmed. A similar approach could also be effective in reducing the chances of transplanted organ failure.

Innovative Experiments

Professor Sakaguchi, from a Japanese institution, performed experiments on rodents that had their immune gland removed, causing autoimmune disease.

He demonstrated that injecting immune cells from healthy mice could stop the illness—implying there was a mechanism for blocking defenders from harming the host.

Mary Brunkow, from the Institute for Systems Biology in a US city, and Fred Ramsdell, now at a biotech firm in a California city, were investigating an inherited autoimmune disease in rodents and people that led to the identification of a genetic factor vital for the way regulatory T-cells function.

"The groundbreaking work has uncovered how the immune system is kept in check by T-reg cells, stopping it from accidentally targeting the body's own tissues," said a prominent physiology specialist.

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