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The Nobel Prize in Physiology or Medicine has been granted for revolutionary findings that illuminate how the body's defense network targets harmful pathogens while protecting the body's own cells.

Three esteemed scientists—Japan's Shimon Sakaguchi and American experts Dr. Brunkow and Dr. Ramsdell—received this accolade.

The work uncovered unique "security guards" within the defense system that eliminate malfunctioning defense cells that could attacking the body.

The discoveries are now paving the way for new treatments for immune disorders and cancer.

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

Crucial Discoveries

"The work has been essential for comprehending how the body's defenses functions and the reason we do not all develop serious self-attack conditions," commented the head of the Nobel Committee.

This team's studies address a fundamental question: In what way does the immune system protect us from countless infections while keeping our healthy cells unharmed?

Our body's protection system uses immune cells that scan for indicators of disease, even pathogens and germs it has not met before.

Such cells employ detectors—called recognition units—that are produced randomly in countless variations.

This provides the defense network the capacity to combat a broad range of invaders, but the randomness of the process unavoidably creates immune cells that may attack the host.

Protectors of the Body

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

The latest award recognizes the discovery of regulatory T-cells—described as the body's "peacekeepers"—which travel through the system to disarm other defenders that attack the body's own tissues.

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

A Nobel panel stated, "These discoveries have established a novel area of investigation and spurred the creation of new therapies, for instance for tumors and autoimmune diseases."

In cancer, T-regs prevent the body from fighting the growth, so research are aimed at reducing their quantity.

For autoimmune diseases, trials are exploring increasing T-reg cells so the organism is no longer under attack. A similar method could also be useful in reducing the chances of transplanted organ rejection.

Innovative Experiments

Prof Sakaguchi, from Osaka University, conducted experiments on rodents that had their immune gland removed, leading to self-attack conditions.

He demonstrated that introducing defense cells from healthy animals could stop the disease—suggesting there was a mechanism for preventing immune cells from harming the body.

Mary Brunkow, affiliated with the Institute for Systems Biology in Seattle, and Fred Ramsdell, currently at a biotech firm in a California city, were investigating an inherited immune disorder in rodents and people that led to the identification of a gene critical for the way regulatory T-cells operate.

"The pioneering research has revealed how the body's defenses is controlled by regulatory T cells, stopping it from accidentally targeting the body's own tissues," commented a leading biological science specialist.

"This work is a striking example of how fundamental biological research can have broad implications for public health."