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The Nobel Prize in Physiology or Medicine was granted for revolutionary discoveries that clarify how the body's defense network targets harmful infections while protecting the healthy tissues.

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

The research identified unique "sentinels" within the defense system that remove rogue defense cells capable of attacking the organism.

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

The winners will share a prize fund worth 11m SEK.

Crucial Discoveries

"Their research has been essential for understanding how the body's defenses functions and why we don't all develop severe autoimmune diseases," commented the head of the Nobel Committee.

The team's studies address a fundamental mystery: How does the immune system defend us from numerous infections while leaving our healthy cells unharmed?

Our body's protection system employs white blood cells that search for indicators of disease, even viruses and bacteria it has not met before.

These cells utilize detectors—called recognition units—that are produced by chance in a vast number of variations.

This gives the defense network the capacity to combat a broad range of threats, but the randomness of the mechanism inevitably produces white blood cells that may target the host.

Security Guards of the Body

Scientists earlier understood that a portion of these harmful defense cells were eliminated in the thymus—where white blood cells mature.

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

It is known that this mechanism malfunctions in autoimmune diseases such as type-1 diabetes, multiple sclerosis, and RA.

The prize committee stated, "These discoveries have laid the foundation for a novel area of research and accelerated the development of innovative therapies, for instance for tumors and autoimmune diseases."

Regarding malignancies, T-regs prevent the body from fighting the growth, so research are focused on lowering their numbers.

For self-attack disorders, experiments are testing increasing regulatory T-cells so the body is no longer being harmed. A similar method could also be effective in minimizing the risks of transplanted organ rejection.

Pioneering Studies

Prof Sakaguchi, from Osaka University, conducted experiments on mice that had their immune gland extracted, leading to autoimmune disease.

The researcher demonstrated that injecting defense cells from other mice could prevent the disease—implying there was a system for blocking defenders from harming the host.

Dr. Brunkow, from the Institute for Systems Biology in Seattle, and Fred Ramsdell, currently at a biotech firm in San Francisco, were investigating an genetic autoimmune disease in rodents and people that resulted in the discovery of a gene vital for how T-regs function.

"Their pioneering work has revealed how the body's defenses is kept in check by regulatory T cells, preventing it from accidentally targeting the healthy cells," commented a leading biological science expert.

"This work is a remarkable example of how fundamental biological research can have far-reaching implications for public health."