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This year's Nobel Prize in medical science has been granted for transformative findings that clarify how the immune system targets dangerous pathogens while sparing the healthy tissues.

Three esteemed scientists—from Japan Prof. Sakaguchi and American experts Mary Brunkow and Fred Ramsdell—received this honor.

The work identified specialized "security guards" within the defense system that remove malfunctioning immune cells that could attacking the organism.

The findings are now paving the way for new treatments for autoimmune diseases and cancer.

The winners will divide a monetary award valued at 11 million SEK.

Crucial Discoveries

"The work has been decisive for comprehending how the immune system operates and the reason we do not all suffer from severe autoimmune diseases," stated the chair of the Nobel Committee.

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

The immune system employs immune cells that search for signs of disease, even viruses and germs it has not met before.

These defenders utilize sensors—known as recognition units—that are produced randomly in a vast number of variations.

That gives the immune system the ability to combat a broad range of threats, but the randomness of the mechanism inevitably produces white blood cells that may target the host.

Protectors of the Body

Researchers earlier knew that some of these problematic defense cells were destroyed in the thymus—where immune cells develop.

This year's award recognizes the discovery of T-reg cells—described as the body's "peacekeepers"—which travel through the system to neutralize any defenders that assault the body's own tissues.

It is known that this process fails in self-attack conditions such as juvenile diabetes, MS, and RA.

The Nobel panel stated, "The discoveries have established a new field of research and accelerated the creation of new treatments, for instance for cancer and immune disorders."

Regarding cancer, regulatory T-cells prevent the body from fighting the growth, so research are focused on lowering their numbers.

For self-attack disorders, trials are exploring increasing regulatory T-cells so the organism is not under attack. A similar approach could also be effective in minimizing the chances of organ transplant rejection.

Pioneering Studies

Professor Shimon Sakaguchi, of a Japanese institution, conducted tests on mice that had their immune gland extracted, leading to autoimmune disease.

He showed that introducing defense cells from other mice could stop the illness—implying there was a system for blocking immune cells from harming the host.

Mary Brunkow, affiliated with the a research center in Seattle, and Dr. Ramsdell, currently at a biotech firm in a California city, were investigating an inherited immune disorder in rodents and people that resulted in the identification of a genetic factor critical for how regulatory T-cells function.

"Their groundbreaking work has uncovered how the immune system is controlled by T-reg cells, preventing it from mistakenly targeting the body's own tissues," said a leading physiology expert.

"The work is a remarkable illustration of how fundamental physiological study can have broad implications for human health."