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This year's prestigious award in Physiology or Medicine has been awarded for revolutionary findings that clarify how the body's defense network targets harmful infections while protecting the healthy tissues.

Three esteemed researchers—Japan's Prof. Sakaguchi and American experts Mary Brunkow and Dr. Ramsdell—received this honor.

The research uncovered unique "sentinels" within the immune system that eliminate rogue defense cells capable of harming the organism.

These findings are now paving the way for innovative treatments for autoimmune diseases and cancer.

These laureates will share a prize fund worth 11m Swedish kronor.

Crucial Findings

"Their research has been decisive for understanding how the body's defenses operates and the reason we don't all develop severe autoimmune diseases," commented the chair of the Nobel Committee.

The team's studies address a fundamental mystery: How does the defense system protect us from countless infections while keeping our healthy cells intact?

The body's protection system employs immune cells that scan for signs of disease, including viruses and germs it has never encountered.

These cells utilize detectors—called recognition units—that are generated randomly in a vast number of combinations.

This provides the immune system the capacity to fight a wide array of invaders, but the unpredictability of the mechanism inevitably creates immune cells that may attack the body.

Security Guards of the Immune System

Researchers earlier understood that a portion of these harmful defense cells were destroyed in the immune organ—where white blood cells mature.

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

We know that this mechanism malfunctions in self-attack conditions such as type-1 diabetes, multiple sclerosis, and rheumatoid arthritis.

A prize committee added, "These discoveries have laid the foundation for a new field of investigation and spurred the development of new treatments, for example for tumors and immune disorders."

Regarding cancer, T-regs block the system from attacking the growth, so research are aimed at reducing their numbers.

In autoimmune diseases, trials are testing boosting T-reg cells so the organism is not being harmed. A comparable method could also be useful in reducing the chances of transplanted organ rejection.

Pioneering Studies

Prof Sakaguchi, from a Japanese institution, conducted tests on rodents that had their immune gland removed, leading to self-attack conditions.

The researcher demonstrated that introducing immune cells from healthy animals could prevent the illness—suggesting there was a system for preventing defenders from attacking the host.

Dr. Brunkow, from the a research center in a US city, and Fred Ramsdell, now at a biotech firm in San Francisco, were investigating an inherited autoimmune disease in rodents and humans that led to the identification of a gene vital for how T-regs function.

"The groundbreaking research has revealed how the immune system is kept in check by regulatory T cells, preventing it from mistakenly attacking the healthy cells," commented a prominent biological science specialist.

"This research is a striking illustration of how basic biological research can have broad consequences for human health."