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The prestigious award in Physiology or Medicine has been awarded for revolutionary discoveries that clarify how the immune system targets dangerous infections while sparing the body's own cells.

Three esteemed scientists—from Japan Shimon Sakaguchi and US experts Mary Brunkow and Dr. Ramsdell—share this honor.

The work identified specialized "security guards" within the immune system that eliminate rogue defense cells capable of attacking the organism.

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

The laureates will share a prize fund worth 11 million Swedish kronor.

Crucial Findings

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

This team's studies address a core mystery: In what way does the immune system protect us from numerous invaders while keeping our healthy cells unharmed?

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

These cells utilize detectors—called recognition units—that are generated randomly in countless variations.

This provides the defense network the ability to combat a broad range of threats, but the randomness of the mechanism unavoidably produces white blood cells that may attack the host.

Security Guards of the Body

Scientists previously understood that some of these problematic white blood cells were eliminated in the thymus—where white blood cells mature.

The latest Nobel Prize honors the discovery of regulatory T-cells—described as the body's "security guards"—which patrol the system to disarm other immune cells that attack the body's own tissues.

We know that this process malfunctions in self-attack conditions such as juvenile diabetes, MS, and rheumatoid arthritis.

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

Regarding cancer, T-regs block the system from fighting the tumor, so research are aimed at lowering their numbers.

For self-attack disorders, trials are testing boosting T-reg cells so the organism is not being harmed. A similar approach could also be effective in reducing the risks of transplanted organ rejection.

Innovative Experiments

Professor Shimon Sakaguchi, from a Japanese institution, performed experiments on rodents that had their immune gland removed, leading to autoimmune disease.

The researcher showed that injecting defense cells from other animals could prevent the disease—suggesting there was a system for preventing defenders from harming the host.

Dr. Brunkow, affiliated with the Institute for Systems Biology in a US city, and Fred Ramsdell, currently at a biotech firm in a California city, were investigating an genetic autoimmune disease in rodents and humans that led to the identification of a genetic factor vital for the way T-regs operate.

"The groundbreaking research has revealed how the immune system is controlled by T-reg cells, preventing it from accidentally targeting the healthy cells," commented a prominent biological science specialist.

"This work is a remarkable illustration of how basic biological study can have far-reaching implications for public health."