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The Nobel Prize in medical science was awarded for transformative findings that clarify how the immune system attacks harmful infections while sparing the healthy tissues.

A trio of renowned researchers—from Japan Prof. Sakaguchi and US experts Mary Brunkow and Dr. Ramsdell—share this honor.

The work identified specialized "sentinels" within the defense system that eliminate rogue defense cells that could attacking the body.

The findings are now paving the way for new therapies for immune disorders and malignancies.

These winners will share a monetary award worth 11m SEK.

Decisive Findings

"The work has been essential for comprehending how the body's defenses operates and the reason we do not all suffer from serious self-attack conditions," commented the head of the award panel.

This trio's research explain a core question: In what way does the defense system defend us from numerous invaders while leaving our own tissues unharmed?

Our immune system employs white blood cells that search for signs of infection, even pathogens and germs it has never encountered.

These defenders employ detectors—called receptors—that are generated by chance in countless combinations.

This gives the defense network the ability to fight a wide array of invaders, but the unpredictability of the process inevitably produces immune cells that may target the host.

Protectors of the Immune System

Scientists earlier understood that a portion of these problematic white blood cells were destroyed in the thymus—where immune cells develop.

The latest Nobel Prize recognizes the discovery of regulatory T-cells—described as the immune system's "security guards"—which patrol the body to neutralize any immune cells that attack the healthy cells.

It is known that this process malfunctions in self-attack conditions such as juvenile diabetes, MS, and RA.

The prize committee stated, "These findings have laid the foundation for a novel area of investigation and accelerated the creation of innovative treatments, for example for tumors and immune disorders."

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

For autoimmune diseases, experiments are exploring increasing regulatory T-cells so the organism is no longer being harmed. A similar method could also be useful in reducing the chances of transplanted organ failure.

Innovative Experiments

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

He demonstrated that introducing immune cells from other mice could stop the illness—implying there was a mechanism for preventing immune cells from harming the host.

Dr. Brunkow, from the Institute for Systems Biology in Seattle, and Dr. Ramsdell, now at Sonoma Biotherapeutics in San Francisco, were studying an inherited autoimmune disease in mice and humans that led to the discovery of a genetic factor critical for the way regulatory T-cells operate.

"The groundbreaking work has revealed how the body's defenses is controlled by regulatory T cells, stopping it from accidentally targeting the body's own tissues," said a leading physiology specialist.

"The research is a striking example of how basic biological research can have far-reaching consequences for human health."