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

A trio of renowned scientists—from Japan Shimon Sakaguchi and American scientists Dr. Brunkow and Dr. Ramsdell—received this honor.

The work identified unique "security guards" within the defense system that remove rogue defense cells that could attacking the organism.

These findings are now enabling new treatments for autoimmune diseases and malignancies.

The winners will share a monetary award worth 11m Swedish kronor.

Crucial Discoveries

"Their work has been essential for comprehending how the immune system functions and why we don't all suffer from serious self-attack conditions," commented the head of the Nobel Committee.

The team's research address a fundamental question: How does the defense system protect us from numerous infections while keeping our own tissues intact?

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

These cells utilize detectors—called receptors—that are produced by chance in countless combinations.

That gives the immune system the capacity to combat a wide array of invaders, but the randomness of the process unavoidably creates immune cells that may target the host.

Security Guards of the Body

Researchers earlier understood that a portion of these problematic defense cells were destroyed in the thymus—where immune cells mature.

This year's award recognizes the identification of regulatory T-cells—known as the body's "peacekeepers"—which patrol the system to neutralize other defenders that assault the healthy cells.

We know that this mechanism fails in self-attack conditions such as juvenile diabetes, multiple sclerosis, and RA.

The Nobel panel added, "These discoveries have laid the foundation for a novel area of investigation and accelerated the creation of innovative therapies, for instance for tumors and immune disorders."

Regarding malignancies, T-regs block the system from attacking the growth, so studies are focused on lowering their quantity.

For self-attack disorders, experiments are exploring increasing T-reg cells so the organism is no longer under attack. A similar method could also be useful in reducing the risks of organ transplant failure.

Innovative Studies

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

The researcher demonstrated that introducing defense cells from other animals could stop the illness—suggesting there was a system for preventing defenders from harming the host.

Mary Brunkow, affiliated with the a research center in Seattle, and Dr. Ramsdell, now at a biotech firm in a California city, were investigating an genetic immune disorder in mice and humans that resulted in the discovery of a gene vital for the way regulatory T-cells operate.

"Their groundbreaking research has revealed how the immune system is controlled by regulatory T cells, stopping it from mistakenly attacking the body's own tissues," said a leading biological science specialist.

"The work is a remarkable example of how fundamental physiological study can have far-reaching consequences for public health."