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This year's prestigious award in Physiology or Medicine was awarded for transformative discoveries that illuminate how the body's defense network attacks harmful infections while sparing the body's own cells.

A trio of renowned researchers—Japan's Shimon Sakaguchi and US experts Mary Brunkow and Dr. Ramsdell—received this accolade.

Their work uncovered unique "sentinels" within the defense system that remove malfunctioning defense cells that could harming the body.

These findings are now enabling innovative therapies for immune disorders and malignancies.

The laureates will divide a prize fund valued at 11 million Swedish kronor.

Crucial Discoveries

"The research has been essential for understanding how the immune system operates and why we don't all develop severe autoimmune diseases," commented the head of the award panel.

The trio's research address a fundamental mystery: In what way does the immune system protect us from countless infections while keeping our healthy cells intact?

The body's protection system uses immune cells that search for signs of disease, including viruses and bacteria it has not met before.

Such cells utilize detectors—called receptors—that are produced randomly in countless combinations.

That provides the immune system the capacity to combat a broad range of threats, but the unpredictability of the mechanism unavoidably creates white blood cells that can target the body.

Protectors of the Immune System

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

The latest award honors the discovery of T-reg cells—described as the body's "security guards"—which patrol the system to neutralize other immune cells that attack the healthy cells.

We know that this mechanism fails in self-attack conditions such as juvenile diabetes, multiple sclerosis, and RA.

A prize committee stated, "These discoveries have laid the foundation for a new field of investigation and spurred the creation of innovative therapies, for example for tumors and autoimmune diseases."

In cancer, regulatory T-cells block the body from fighting the tumor, so research are aimed at lowering their quantity.

In autoimmune diseases, trials are testing increasing T-reg cells so the body is no longer being harmed. A comparable method could also be effective in minimizing the chances of organ transplant failure.

Innovative Studies

Prof Sakaguchi, from Osaka University, performed experiments on rodents that had their immune gland extracted, leading to self-attack conditions.

He showed that introducing defense cells from healthy mice could stop the illness—suggesting there was a mechanism for blocking defenders from harming the body.

Dr. Brunkow, affiliated with the Institute for Systems Biology in a US city, and Fred Ramsdell, currently at Sonoma Biotherapeutics in a California city, were investigating an inherited autoimmune disease in rodents and people that led to the discovery of a genetic factor vital for how regulatory T-cells operate.

"The pioneering research has revealed how the body's defenses is kept in check by regulatory T cells, preventing it from mistakenly targeting the body's own tissues," commented a prominent biological science expert.

"This research is a remarkable illustration of how basic biological research can have far-reaching consequences for public health."