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This year's Nobel Prize in Physiology or Medicine has been granted for revolutionary findings that clarify how the body's defense network targets dangerous pathogens while protecting the body's own cells.

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

The work uncovered specialized "sentinels" within the immune system that remove rogue defense cells that could attacking the body.

These findings are now enabling innovative treatments for autoimmune diseases and malignancies.

These winners will share a prize fund valued at 11 million Swedish kronor.

Decisive Discoveries

"Their work has been decisive for comprehending how the body's defenses operates and the reason we don't all develop severe self-attack conditions," stated the head of the Nobel Committee.

This trio's research explain a core question: In what way does the defense system defend us from countless infections while keeping our own tissues unharmed?

Our body's protection system employs immune cells that scan for signs of infection, including pathogens and germs it has not met before.

These defenders employ sensors—called receptors—that are produced randomly in countless variations.

This provides the defense network the capacity to fight a broad range of invaders, but the randomness of the mechanism unavoidably produces immune cells that may attack the host.

Security Guards of the Body

Researchers previously understood that a portion of these problematic defense cells were destroyed in the thymus—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 disarm other immune cells that attack the healthy cells.

It is known that this process fails in autoimmune diseases such as juvenile diabetes, multiple sclerosis, and rheumatoid arthritis.

A prize committee stated, "The discoveries have laid the foundation for a novel area of investigation and spurred the development of new therapies, for example for tumors and autoimmune diseases."

In malignancies, regulatory T-cells prevent the body from attacking the growth, so studies are aimed at reducing their quantity.

In self-attack disorders, trials are exploring boosting regulatory T-cells so the body is no longer under attack. A comparable approach could also be effective in minimizing the chances of transplanted organ rejection.

Pioneering Experiments

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

The researcher demonstrated that introducing defense cells from healthy animals could prevent the disease—suggesting there was a system for blocking immune cells from harming the body.

Mary 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 rodents and people that resulted in the discovery of a gene critical for the way T-regs function.

"The groundbreaking work has uncovered how the immune system is kept in check by regulatory T cells, stopping it from accidentally targeting the body's own tissues," said a prominent biological science expert.

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