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This year's Nobel Prize in Physiology or Medicine was granted for revolutionary discoveries that clarify how the body's defense network attacks dangerous pathogens while sparing the body's own cells.

Three renowned researchers—from Japan Prof. Sakaguchi and American scientists Dr. Brunkow and Dr. Ramsdell—received this honor.

Their research identified unique "security guards" within the defense system that eliminate malfunctioning immune cells that could attacking the body.

These findings are now paving the way for new therapies for autoimmune diseases and malignancies.

The laureates will divide a prize fund worth 11m SEK.

Decisive Findings

"Their research has been essential for comprehending how the body's defenses operates and the reason we don't all develop serious self-attack conditions," commented the head of the Nobel Committee.

The team's studies explain a core mystery: How does the defense system defend us from numerous infections while leaving our healthy cells intact?

The immune system employs white blood cells that scan for indicators of disease, including pathogens and bacteria it has not met before.

Such defenders employ detectors—known as receptors—that are produced randomly in a vast number of variations.

This gives the defense network the capacity to fight a wide array of invaders, but the unpredictability of the process unavoidably creates immune cells that may target the host.

Protectors of the Body

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

This year's award recognizes the discovery of T-reg cells—described as the immune system's "peacekeepers"—which patrol the body to disarm any immune cells that attack the body's own tissues.

It is known that this mechanism fails in self-attack conditions such as type-1 diabetes, multiple sclerosis, and RA.

A Nobel panel stated, "The discoveries have laid the foundation for a novel area of research and spurred the development of new treatments, for example for cancer and immune disorders."

In malignancies, regulatory T-cells prevent the body from attacking the tumor, so studies are aimed at lowering their quantity.

In autoimmune diseases, trials are testing boosting T-reg cells so the body is not under attack. A comparable approach could also be useful in minimizing the risks of transplanted organ failure.

Pioneering Experiments

Professor Sakaguchi, from a Japanese institution, performed experiments on mice that had their thymus extracted, leading to self-attack conditions.

He showed that injecting defense cells from healthy animals could prevent the illness—implying there was a mechanism for blocking defenders from harming the host.

Dr. Brunkow, affiliated with the a research center in Seattle, and Fred Ramsdell, currently at a biotech firm in a California city, were studying an genetic autoimmune disease in mice and people that led to the discovery of a gene critical for how T-regs function.

"The pioneering research has revealed how the immune system is controlled by regulatory T cells, stopping it from accidentally attacking the body's own tissues," said a prominent biological science expert.

"This research is a striking example of how fundamental biological research can have broad consequences for public health."