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This year's prestigious award in Physiology or Medicine was granted for transformative findings that clarify how the body's defense network attacks harmful infections while sparing the healthy tissues.

Three esteemed scientists—from Japan Prof. Sakaguchi and American scientists Mary Brunkow and Dr. Ramsdell—received this accolade.

Their research identified specialized "security guards" within the immune system that eliminate malfunctioning defense cells that could harming the body.

The findings are now enabling new therapies for autoimmune diseases and malignancies.

The winners will share a prize fund worth 11m Swedish kronor.

Crucial Findings

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

This team's research address a core question: How does the defense system protect us from numerous invaders while keeping our healthy cells unharmed?

The body's protection system uses immune cells that search for signs of infection, including viruses and germs it has not met before.

Such defenders utilize detectors—called recognition units—that are produced by chance in a vast number of combinations.

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 can target the host.

Protectors of the Immune System

Scientists earlier understood that a portion of these problematic white blood cells were eliminated in the thymus—the site where white blood cells develop.

The latest Nobel Prize recognizes the identification of T-reg cells—known as the body's "peacekeepers"—which patrol the body to disarm other defenders that assault the body's own tissues.

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

The Nobel panel stated, "These discoveries have laid the foundation for a new field of research and spurred the creation of innovative therapies, for instance for cancer and autoimmune diseases."

In malignancies, regulatory T-cells prevent the body from fighting the tumor, so studies are focused on lowering their numbers.

In self-attack disorders, trials are testing increasing regulatory T-cells so the body is not under attack. A similar approach could also be useful in minimizing the chances of organ transplant rejection.

Innovative Studies

Professor Sakaguchi, from a Japanese institution, performed tests on rodents that had their immune gland extracted, causing self-attack conditions.

The researcher showed that introducing defense cells from other animals could prevent the disease—suggesting there was a system for preventing immune cells from harming the host.

Dr. Brunkow, from the a research center in Seattle, and Dr. Ramsdell, currently at Sonoma Biotherapeutics in San Francisco, were investigating an inherited autoimmune disease in mice and people that resulted in the identification of a gene vital for how regulatory T-cells operate.

"Their groundbreaking research has revealed how the immune system is controlled by T-reg cells, stopping it from mistakenly attacking the healthy cells," commented a leading biological science expert.

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