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The prestigious award in Physiology or Medicine was granted for transformative discoveries that illuminate how the immune system attacks dangerous infections while protecting the body's own cells.

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

The research identified unique "security guards" within the defense system that eliminate malfunctioning defense cells capable of harming the body.

These discoveries are now enabling innovative treatments for immune disorders and cancer.

The winners will share a monetary award worth 11m Swedish kronor.

Decisive Findings

"The work has been essential for comprehending how the immune system functions and why we don't all suffer from severe self-attack conditions," stated the chair of the Nobel Committee.

The trio's studies address a fundamental mystery: How does the defense system defend us from numerous invaders while keeping our own tissues unharmed?

Our immune system employs immune cells that scan for signs of disease, including pathogens and bacteria it has never encountered.

Such cells utilize detectors—known as recognition units—that are produced randomly in countless combinations.

This provides the immune system the capacity to combat a wide array of threats, but the randomness of the process unavoidably creates immune cells that may attack the body.

Protectors of the Body

Scientists earlier knew that a portion of these harmful defense cells were destroyed in the thymus—the site where white blood cells develop.

This year's award honors the identification of regulatory T-cells—known as the immune system's "peacekeepers"—which travel through the system to neutralize other defenders that attack the healthy cells.

We know that this mechanism malfunctions in self-attack conditions such as juvenile diabetes, MS, and RA.

The Nobel panel added, "These findings have established a new field of research and spurred the creation of new treatments, for instance for tumors and autoimmune diseases."

Regarding malignancies, T-regs prevent the system from attacking the tumor, so studies are focused on lowering their numbers.

For autoimmune diseases, experiments are exploring boosting regulatory T-cells so the organism is no longer being harmed. A similar method could also be effective in minimizing the risks of transplanted organ failure.

Innovative Experiments

Prof Shimon Sakaguchi, from a Japanese institution, performed tests on rodents that had their immune gland extracted, leading to autoimmune disease.

He showed that injecting immune cells from healthy animals could prevent the disease—suggesting there was a mechanism for preventing immune cells from attacking the body.

Dr. Brunkow, from the Institute for Systems Biology in a US city, and Dr. Ramsdell, currently at a biotech firm in San Francisco, were investigating an genetic immune disorder in mice and people that led to the identification of a gene vital for the way T-regs operate.

"Their groundbreaking work has uncovered how the body's defenses is kept in check by regulatory T cells, stopping it from mistakenly attacking the body's own tissues," commented a leading physiology expert.

"The work is a striking illustration of how basic biological research can have broad consequences for public health."