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This year's Nobel Prize in medical science has been granted for transformative findings that illuminate how the immune system attacks dangerous infections while sparing the body's own cells.

A trio of renowned scientists—Japan's Prof. Sakaguchi and US scientists Dr. Brunkow and Dr. Ramsdell—received this accolade.

Their work uncovered specialized "security guards" within the immune system that eliminate rogue immune cells capable of harming the body.

These findings are now paving the way for innovative treatments for immune disorders and malignancies.

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

Crucial Discoveries

"Their work has been essential for comprehending how the body's defenses functions and the reason we do not all develop serious self-attack conditions," stated the chair of the Nobel Committee.

The team's research explain a core mystery: In what way does the defense system defend us from countless invaders while leaving our healthy cells unharmed?

The body's protection system uses white blood cells that search for signs of infection, even viruses and germs it has never encountered.

Such cells employ detectors—known as recognition units—that are generated randomly in a vast number of variations.

This gives the immune system the ability to fight a broad range of invaders, but the unpredictability of the mechanism inevitably produces white blood cells that may attack the body.

Security Guards of the Body

Scientists previously understood that a portion of these harmful white blood cells were destroyed in the thymus—where white blood cells develop.

The latest Nobel Prize recognizes the discovery of T-reg cells—described as the body's "peacekeepers"—which travel through the system to disarm any defenders that attack the body's own tissues.

It is known that this process malfunctions in self-attack conditions such as type-1 diabetes, multiple sclerosis, and rheumatoid arthritis.

The Nobel panel added, "The discoveries have established a new field of research and spurred the creation of new treatments, for instance for tumors and immune disorders."

In cancer, regulatory T-cells block the body from attacking the growth, so studies are aimed at reducing their quantity.

In autoimmune diseases, trials are exploring increasing regulatory T-cells so the body is not under attack. A similar method could also be effective in reducing the chances of transplanted organ rejection.

Pioneering Experiments

Prof Shimon Sakaguchi, from Osaka University, performed tests on mice that had their immune gland removed, causing self-attack conditions.

He showed that introducing immune cells from healthy animals could prevent the disease—suggesting there was a mechanism for preventing immune cells from attacking the body.

Dr. Brunkow, affiliated with the a research center in a US city, and Fred Ramsdell, now at a biotech firm in a California city, were studying an inherited immune disorder in mice and humans that resulted in the identification of a genetic factor vital for the way T-regs operate.

"Their pioneering work has uncovered how the immune system is kept in check by regulatory T cells, preventing it from accidentally attacking the healthy cells," commented a leading biological science specialist.

"The work is a striking example of how basic biological research can have broad consequences for public health."