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The prestigious award in medical science has been awarded for transformative discoveries that illuminate how the body's defense network attacks dangerous infections while sparing the body's own cells.

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

The work identified specialized "security guards" within the defense system that eliminate malfunctioning defense cells that could harming the organism.

These discoveries are now paving the way for innovative treatments for autoimmune diseases and malignancies.

These laureates will divide a prize fund worth 11 million Swedish kronor.

Crucial Discoveries

"The research has been essential for comprehending how the immune system functions and why we don't all develop severe self-attack conditions," stated the head of the Nobel Committee.

This team's research address a fundamental mystery: How does the defense system defend us from countless invaders while leaving our own tissues intact?

The immune system uses white blood cells that search for indicators of infection, even pathogens and bacteria it has not met before.

Such defenders utilize sensors—called receptors—that are produced randomly in countless combinations.

This gives the defense network the capacity to combat a wide array of invaders, but the unpredictability of the mechanism unavoidably creates immune cells that can attack the host.

Security Guards of the Immune System

Scientists previously knew that some of these problematic defense cells were eliminated in the thymus—where white blood cells develop.

The latest Nobel Prize recognizes the discovery of T-reg cells—known as the body's "peacekeepers"—which patrol the system to neutralize other defenders that assault the healthy cells.

It is known that this process fails in autoimmune diseases such as juvenile diabetes, multiple sclerosis, and rheumatoid arthritis.

The prize committee added, "The findings have laid the foundation for a novel area of investigation and accelerated the development of new therapies, for example for tumors and immune disorders."

Regarding malignancies, T-regs block the body from fighting the growth, so research are aimed at lowering their quantity.

For autoimmune diseases, experiments are exploring increasing regulatory T-cells so the organism is not under attack. A similar approach could also be useful in minimizing the chances of transplanted organ failure.

Pioneering Experiments

Professor Shimon Sakaguchi, of a Japanese institution, conducted tests on rodents that had their thymus extracted, causing autoimmune disease.

He demonstrated that injecting defense cells from healthy animals could stop the illness—suggesting there was a mechanism for preventing immune cells from attacking the host.

Mary Brunkow, from the Institute for Systems Biology in Seattle, and Fred Ramsdell, currently at a biotech firm in a California city, were studying an inherited immune disorder in rodents and humans that led to the identification of a genetic factor critical for how regulatory T-cells operate.

"Their pioneering work has revealed how the immune system is kept in check by T-reg cells, preventing it from mistakenly attacking the body's own tissues," commented a leading biological science specialist.

"This work is a remarkable example of how basic biological research can have far-reaching implications for human health."