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This year's Nobel Prize in medical science was granted for transformative discoveries that illuminate how the body's defense network targets harmful infections while sparing the body's own cells.

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

The work identified unique "security guards" within the immune system that eliminate rogue immune cells that could harming the body.

The discoveries are now paving the way for innovative treatments for autoimmune diseases and malignancies.

These laureates will share a monetary award worth 11 million Swedish kronor.

Crucial Discoveries

"Their research has been essential for understanding how the immune system operates and the reason we don't all suffer from serious self-attack conditions," commented the head of the Nobel Committee.

This team's studies address a fundamental mystery: In what way does the defense system defend us from numerous infections while leaving our own tissues intact?

Our immune system employs immune cells that scan for indicators of disease, even viruses and bacteria it has not met before.

These defenders employ sensors—known as receptors—that are generated by chance in a vast number of combinations.

That gives the defense network the capacity to combat a broad range of invaders, but the randomness of the process unavoidably creates white blood cells that can attack the body.

Security Guards of the Body

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

The latest Nobel Prize honors the discovery of T-reg cells—known as the immune system's "security guards"—which travel through the system to neutralize any defenders that attack the body's own tissues.

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

The prize committee added, "These findings have established a new field of investigation and accelerated the development of innovative treatments, for instance for cancer and immune disorders."

In malignancies, T-regs block the body from attacking the growth, so research are aimed at reducing their quantity.

For self-attack disorders, experiments are testing increasing T-reg cells so the body is no longer being harmed. A similar approach could also be effective in reducing the risks of organ transplant failure.

Pioneering Experiments

Prof Shimon Sakaguchi, from Osaka University, performed experiments on rodents that had their immune gland removed, causing self-attack conditions.

The researcher showed that injecting defense cells from other animals could stop the disease—suggesting there was a system for preventing defenders from attacking the body.

Mary Brunkow, affiliated with the Institute for Systems Biology in Seattle, and Fred Ramsdell, now at a biotech firm in San Francisco, were studying an genetic autoimmune disease in rodents and people that led to the identification of a gene critical for the way regulatory T-cells function.

"The pioneering research has revealed how the immune system is controlled by regulatory T cells, stopping it from mistakenly targeting the body's own tissues," commented a prominent biological science specialist.

"This work is a striking example of how fundamental physiological research can have far-reaching implications for human health."