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The Nobel Prize in Physiology or Medicine was granted for transformative findings that illuminate how the immune system attacks dangerous infections while protecting the body's own cells.

Three esteemed researchers—Japan's Prof. Sakaguchi and American experts Dr. Brunkow and Fred Ramsdell—received this accolade.

The research identified unique "sentinels" within the immune system that eliminate malfunctioning defense cells that could harming the body.

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

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

Crucial Discoveries

"Their work has been essential for comprehending how the body's defenses functions and the reason we don't all develop severe self-attack conditions," stated the chair of the award panel.

This trio's research explain a fundamental question: In what way does the immune system defend us from numerous invaders while leaving our healthy cells unharmed?

The immune system employs immune cells that scan for signs of infection, including pathogens and germs it has never encountered.

Such defenders utilize sensors—known as receptors—that are produced by chance in a vast number of variations.

That gives the immune system the ability to fight a broad range of invaders, but the unpredictability of the mechanism unavoidably creates immune cells that can target the body.

Security Guards of the Immune System

Researchers previously knew that some of these harmful defense cells were eliminated in the thymus—where immune cells mature.

The latest Nobel Prize recognizes the discovery of regulatory T-cells—described as the body's "peacekeepers"—which travel through the body to neutralize any immune cells that assault the body's own tissues.

We know that this mechanism malfunctions in self-attack conditions such as type-1 diabetes, multiple sclerosis, and rheumatoid arthritis.

The prize committee added, "The findings have established a new field of research and spurred the creation of innovative therapies, for instance for cancer and immune disorders."

In malignancies, T-regs prevent the body from attacking the growth, so research are focused on reducing their numbers.

For self-attack disorders, trials are testing increasing regulatory T-cells so the body is not under attack. A similar method could also be useful in minimizing the risks of transplanted organ rejection.

Pioneering Studies

Professor Sakaguchi, from Osaka University, conducted tests on rodents that had their immune gland removed, causing autoimmune disease.

He showed that injecting defense cells from other mice could prevent the disease—suggesting there was a mechanism for preventing immune cells from harming the body.

Mary Brunkow, from the Institute for Systems Biology in Seattle, and Dr. Ramsdell, now at a biotech firm in a California city, were investigating an inherited autoimmune disease in mice and people that resulted in the discovery of a genetic factor critical for how regulatory T-cells operate.

"Their groundbreaking work has uncovered how the body's defenses is kept in check by T-reg cells, stopping it from accidentally targeting the body's own tissues," said a prominent biological science expert.

"The research is a striking illustration of how fundamental biological study can have far-reaching implications for public health."