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The Nobel Prize in medical science was granted for revolutionary findings that illuminate how the body's defense network attacks harmful infections while protecting the body's own cells.

A trio of renowned scientists—from Japan Shimon Sakaguchi and American scientists Mary Brunkow and Dr. Ramsdell—share this honor.

Their research uncovered specialized "sentinels" within the defense system that eliminate malfunctioning defense cells capable of attacking the organism.

These findings are now paving the way for new treatments for autoimmune diseases and malignancies.

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

Crucial Findings

"Their work has been essential for comprehending how the immune system operates and why we don't all suffer from severe self-attack conditions," commented the head of the award panel.

The trio's research explain a fundamental mystery: How does the immune system protect us from numerous invaders while keeping our own tissues intact?

The immune system employs immune cells that scan for signs of infection, including pathogens and bacteria it has not met before.

These cells utilize sensors—called receptors—that are generated by chance in countless combinations.

That provides the immune system the capacity to combat a broad range of threats, but the randomness of the process inevitably produces white blood cells that can attack the host.

Protectors of the Immune System

Researchers previously knew that a portion of these harmful white blood cells were eliminated in the immune organ—where white blood cells mature.

This year's award honors the discovery of regulatory T-cells—described as the body's "security guards"—which travel through the body to disarm other immune cells that attack the body's own tissues.

We know that this process malfunctions in self-attack conditions such as type-1 diabetes, MS, and rheumatoid arthritis.

The prize committee stated, "The findings have established a new field of investigation and spurred the creation of new treatments, for instance for cancer and autoimmune diseases."

Regarding cancer, regulatory T-cells block the system from attacking the growth, so studies are aimed at reducing their numbers.

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

Pioneering Studies

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

The researcher demonstrated that injecting defense cells from healthy mice could prevent the illness—suggesting there was a mechanism for blocking immune cells from harming the host.

Dr. Brunkow, from the a research center in a US city, and Fred Ramsdell, now at Sonoma Biotherapeutics in San Francisco, were studying an genetic autoimmune disease in rodents and humans that led to the identification of a genetic factor critical for the way T-regs function.

"Their pioneering work has uncovered how the immune system is controlled by regulatory T cells, stopping it from accidentally attacking the healthy cells," commented a prominent biological science expert.

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