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The Nobel Prize in Physiology or Medicine was granted for revolutionary discoveries that clarify how the immune system targets harmful infections while sparing the body's own cells.

A trio of renowned scientists—from Japan Shimon Sakaguchi and US scientists Dr. Brunkow and Dr. Ramsdell—share this honor.

Their work uncovered specialized "security guards" within the defense system that eliminate rogue defense cells that could attacking the body.

The discoveries are now enabling new therapies for immune disorders and malignancies.

The laureates will share a monetary award valued at 11 million SEK.

Crucial Findings

"Their work has been decisive for comprehending how the body's defenses functions and why we do not all develop serious autoimmune diseases," commented the head of the Nobel Committee.

This team's research explain a core question: In what way does the immune system protect us from numerous infections while keeping our own tissues intact?

The body's protection system employs white blood cells that search for indicators of disease, even viruses and germs it has not met before.

Such defenders employ detectors—known as receptors—that are produced by chance in countless variations.

This provides the defense network the capacity to fight a broad range of threats, but the unpredictability of the mechanism inevitably produces white blood cells that may attack the host.

Security Guards of the Immune System

Scientists earlier understood that a portion of these problematic defense cells were eliminated in the thymus—the site where immune cells develop.

This year's Nobel Prize honors the discovery of regulatory T-cells—described as the immune system's "security guards"—which patrol the system to neutralize any defenders that attack the healthy cells.

It is known that this process fails in autoimmune diseases such as type-1 diabetes, multiple sclerosis, and rheumatoid arthritis.

A Nobel panel stated, "These findings have laid the foundation for a new field of investigation and spurred the creation of new treatments, for instance for cancer and autoimmune diseases."

In malignancies, T-regs block the body from fighting the tumor, so studies are aimed at reducing their numbers.

In self-attack disorders, experiments are testing increasing T-reg cells so the body is not being harmed. A similar method could also be effective in minimizing the chances of transplanted organ rejection.

Pioneering Experiments

Prof Shimon Sakaguchi, from a Japanese institution, conducted experiments on mice that had their immune gland removed, leading to autoimmune disease.

The researcher showed that injecting defense cells from other mice could stop the disease—implying there was a system for blocking defenders from attacking the host.

Dr. Brunkow, affiliated with the a research center in Seattle, and Dr. Ramsdell, now at a biotech firm in San Francisco, were investigating an genetic immune disorder in rodents and people that led to the identification of a genetic factor vital for how T-regs operate.

"The groundbreaking research has uncovered how the immune system is controlled by T-reg cells, stopping it from accidentally attacking the body's own tissues," commented a leading physiology expert.

"The research is a remarkable illustration of how basic physiological study can have broad implications for public health."