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

A trio of esteemed researchers—from Japan Prof. Sakaguchi and US experts Dr. Brunkow and Fred Ramsdell—share this accolade.

The research uncovered specialized "security guards" within the defense system that eliminate malfunctioning immune cells that could harming the body.

These discoveries are now enabling innovative treatments for immune disorders and cancer.

The winners will share a prize fund valued at 11 million SEK.

Crucial Findings

"Their work has been decisive for comprehending how the immune system functions and why we do not all suffer from severe self-attack conditions," commented the head of the Nobel Committee.

This trio's research address a core mystery: In what way does the immune system protect us from countless invaders while keeping our own tissues intact?

The immune system uses white blood cells that search for signs of infection, including pathogens and bacteria it has never encountered.

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

This provides the immune system the capacity to fight a broad range of threats, but the randomness of the process unavoidably creates white blood cells that can target the body.

Protectors of the Immune System

Researchers earlier knew that a portion of these problematic white blood cells were eliminated in the thymus—where immune cells develop.

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

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

The Nobel panel added, "These findings have established a new field of investigation and spurred the development of innovative therapies, for instance for cancer and autoimmune diseases."

In malignancies, regulatory T-cells prevent the body from attacking the growth, so studies are aimed at lowering their quantity.

In self-attack disorders, experiments are testing increasing regulatory T-cells so the body is not under attack. A comparable method could also be useful in reducing the risks of organ transplant failure.

Pioneering Experiments

Prof Sakaguchi, of a Japanese institution, performed experiments on rodents that had their thymus removed, causing autoimmune disease.

The researcher demonstrated that introducing defense cells from healthy mice could prevent the disease—suggesting there was a mechanism for blocking immune cells from harming the host.

Mary Brunkow, affiliated with the a research center in a US city, and Fred Ramsdell, now at Sonoma Biotherapeutics in a California city, were studying an genetic immune disorder in mice and people that resulted in the discovery of a genetic factor critical for the way T-regs operate.

"The groundbreaking research has revealed how the body's defenses is kept in check by regulatory T cells, stopping it from mistakenly attacking the body's own tissues," commented a leading biological science specialist.

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