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The Nobel Prize in medical science has been awarded for revolutionary discoveries that illuminate how the body's defense network targets harmful infections while sparing the healthy tissues.

Three renowned researchers—Japan's Shimon Sakaguchi and American experts Mary Brunkow and Fred Ramsdell—received this accolade.

The work identified specialized "sentinels" within the defense system that remove malfunctioning immune cells capable of harming the organism.

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

The laureates will share a prize fund valued at 11m Swedish kronor.

Crucial Findings

"The research has been decisive for comprehending how the body's defenses operates and why we do not all develop severe self-attack conditions," commented the chair of the award panel.

The trio's studies address a fundamental question: How does the immune system protect us from countless invaders while leaving our healthy cells intact?

Our body's protection system employs white blood cells that search for signs of infection, including pathogens and germs it has not met before.

These cells utilize detectors—known as receptors—that are generated randomly in a vast number of variations.

This gives the defense network the capacity to combat a broad range of invaders, but the unpredictability of the mechanism inevitably creates white blood cells that may attack the body.

Security Guards of the Body

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

This year's award honors the identification of T-reg cells—known as the immune system's "security guards"—which patrol the system to neutralize any immune cells that attack the body's own tissues.

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

A prize committee added, "The findings have established a novel area of investigation and accelerated the development of new therapies, for instance for cancer and autoimmune diseases."

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

In autoimmune diseases, experiments are exploring increasing T-reg cells so the body is no longer being harmed. A comparable approach could also be effective in reducing the risks of transplanted organ failure.

Innovative Studies

Prof Shimon Sakaguchi, of a Japanese institution, conducted experiments on rodents that had their immune gland removed, causing autoimmune disease.

The researcher demonstrated that introducing defense cells from other mice could prevent the illness—implying there was a mechanism for blocking defenders from harming the host.

Dr. Brunkow, from the a research center in Seattle, and Dr. Ramsdell, currently at Sonoma Biotherapeutics in San Francisco, were investigating an inherited autoimmune disease in rodents and humans that resulted in the discovery of a gene critical for how T-regs function.

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

"The research is a remarkable example of how fundamental physiological study can have broad consequences for human health."