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The prestigious award in medical science was granted for transformative discoveries that illuminate how the immune system attacks dangerous infections while protecting the healthy tissues.

A trio of renowned scientists—Japan's Prof. Sakaguchi and US experts Mary Brunkow and Fred Ramsdell—received this accolade.

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

The findings are now paving the way for innovative therapies for immune disorders and malignancies.

The laureates will divide a prize fund valued at 11m SEK.

Decisive Findings

"The research has been essential for comprehending how the body's defenses operates and the reason we do not all develop severe self-attack conditions," stated the chair of the Nobel Committee.

The team's research explain a core question: How does the immune system protect us from numerous invaders while keeping our healthy cells intact?

The body's protection system employs white blood cells that scan for indicators of infection, including pathogens and bacteria it has not met before.

These cells employ sensors—known as recognition units—that are produced randomly in a vast number of combinations.

This gives the defense network the ability to fight a wide array of threats, but the unpredictability of the mechanism unavoidably creates white blood cells that may target the host.

Protectors of the Body

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

The latest award honors the discovery of regulatory T-cells—known as the body's "security guards"—which travel through the system to neutralize any immune cells that assault the healthy cells.

It is known that this mechanism fails in self-attack conditions such as type-1 diabetes, multiple sclerosis, and rheumatoid arthritis.

The Nobel panel stated, "These findings have established a new field of research and spurred the development of new therapies, for instance for tumors and autoimmune diseases."

Regarding cancer, regulatory T-cells prevent the system from attacking the tumor, so studies are focused on lowering their numbers.

For autoimmune diseases, experiments are exploring increasing T-reg cells so the organism is not under attack. A similar method could also be effective in reducing the risks of organ transplant failure.

Pioneering Experiments

Professor Sakaguchi, from Osaka University, conducted experiments on mice that had their thymus extracted, leading to self-attack conditions.

The researcher demonstrated that injecting defense cells from other mice could stop the disease—implying there was a system for blocking immune cells from attacking the body.

Mary Brunkow, from the a research center in Seattle, and Fred Ramsdell, now at a biotech firm in San Francisco, were investigating an genetic autoimmune disease in mice and humans that resulted in the identification of a gene critical for how T-regs function.

"The pioneering work has revealed how the immune system is controlled by regulatory T cells, stopping it from accidentally targeting the body's own tissues," said a prominent physiology specialist.

"This research is a striking example of how fundamental biological research can have far-reaching consequences for human health."