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The prestigious award in medical science has been granted for revolutionary discoveries that clarify how the body's defense network targets harmful infections while sparing the healthy tissues.

Three esteemed researchers—Japan's Shimon Sakaguchi and American scientists Dr. Brunkow and Fred Ramsdell—share this accolade.

Their work uncovered specialized "security guards" within the immune system that eliminate malfunctioning immune cells capable of harming the organism.

The findings are now paving the way for innovative therapies for autoimmune diseases and cancer.

The laureates will divide a prize fund valued at 11 million Swedish kronor.

Crucial Findings

"The work has been essential for comprehending how the body's defenses functions and why we do not all suffer from severe autoimmune diseases," commented the chair of the Nobel Committee.

This trio's research address a fundamental mystery: How does the immune system protect us from numerous invaders while keeping our healthy cells unharmed?

The immune system uses immune cells that scan for indicators of disease, even viruses and bacteria it has never encountered.

Such defenders employ sensors—known as recognition units—that are produced randomly in countless variations.

This gives the immune system the ability to combat a wide array of invaders, but the randomness of the process inevitably creates immune cells that can attack the host.

Security Guards of the Immune System

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

The latest award recognizes the discovery of T-reg cells—described as the immune system's "security guards"—which patrol the body to disarm any defenders that assault the body's own tissues.

We know that this process malfunctions in autoimmune diseases such as type-1 diabetes, MS, and RA.

The Nobel panel added, "The discoveries have laid the foundation for a new field of investigation and accelerated the development of new therapies, for instance for cancer and immune disorders."

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

For self-attack disorders, trials are testing increasing T-reg cells so the body is no longer under attack. A similar method could also be useful in minimizing the chances of transplanted organ rejection.

Innovative Experiments

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

He demonstrated that introducing defense cells from healthy animals could stop the illness—suggesting there was a system for preventing immune cells from harming the host.

Dr. Brunkow, from the Institute for Systems Biology in a US city, and Dr. Ramsdell, currently at a biotech firm in a California city, were investigating an inherited immune disorder in mice and humans that led to the discovery of a gene critical for the way regulatory T-cells operate.

"The groundbreaking research has uncovered how the immune system is kept in check by T-reg cells, preventing it from mistakenly attacking the body's own tissues," said a prominent physiology expert.

"This research is a remarkable illustration of how basic physiological research can have broad consequences for public health."