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The prestigious award in Physiology or Medicine has been granted for transformative discoveries that illuminate how the body's defense network targets harmful infections while sparing the body's own cells.

A trio of renowned researchers—Japan's Shimon Sakaguchi and US scientists Mary Brunkow and Dr. Ramsdell—share this honor.

Their research identified unique "sentinels" within the immune system that eliminate rogue defense cells that could harming the organism.

The findings are now paving the way for innovative treatments for immune disorders and cancer.

These winners will share a prize fund worth 11 million Swedish kronor.

Crucial Findings

"Their work has been essential for understanding how the body's defenses operates and why we do not all suffer from serious autoimmune diseases," stated the chair of the award panel.

The team's research address a core question: How does the immune system defend us from countless infections while keeping our own tissues unharmed?

The body's protection system employs white blood cells that scan for indicators of infection, including viruses and germs it has never encountered.

Such defenders utilize sensors—called recognition units—that are produced by chance in countless variations.

That gives the immune system the capacity to fight a broad range of invaders, but the unpredictability of the process unavoidably produces immune cells that can attack the host.

Security Guards of the Body

Scientists previously understood that a portion of these problematic white blood cells were destroyed in the immune organ—where white blood cells mature.

This year's award recognizes the discovery of T-reg cells—described as the immune system's "security guards"—which patrol the system to disarm any immune cells that attack the healthy cells.

It is known that this process malfunctions in self-attack conditions such as type-1 diabetes, MS, and rheumatoid arthritis.

The Nobel panel added, "The discoveries have laid the foundation for a new field of investigation and spurred the creation of new treatments, for instance for tumors and autoimmune diseases."

In malignancies, regulatory T-cells prevent the system from fighting the tumor, so research are aimed at reducing their numbers.

In self-attack disorders, trials are testing increasing regulatory T-cells so the body is not being harmed. A similar approach could also be useful in reducing the chances of organ transplant rejection.

Innovative Experiments

Professor Shimon Sakaguchi, from Osaka University, conducted experiments on mice that had their thymus removed, causing autoimmune disease.

The researcher demonstrated that injecting defense cells from healthy mice could stop the disease—suggesting there was a system for preventing immune cells from harming the host.

Mary Brunkow, from the a research center in a US city, and Dr. Ramsdell, currently at a biotech firm in a California city, were studying an genetic immune disorder in mice and humans that resulted in the identification of a genetic factor vital for the way T-regs function.

"The pioneering work has uncovered how the immune system is controlled by T-reg cells, stopping it from mistakenly targeting the healthy cells," said a leading physiology expert.

"This work is a remarkable example of how fundamental physiological study can have broad implications for human health."