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The Nobel Prize in Physiology or Medicine has been granted for revolutionary findings that clarify how the body's defense network attacks harmful pathogens while sparing the body's own cells.

A trio of esteemed scientists—Japan's Shimon Sakaguchi and American experts Dr. Brunkow and Dr. Ramsdell—received this accolade.

Their research uncovered specialized "security guards" within the defense system that remove malfunctioning defense cells that could attacking the body.

The findings are now enabling new therapies for autoimmune diseases and malignancies.

These laureates will share a monetary award valued at 11m Swedish kronor.

Crucial Discoveries

"Their work has been essential for comprehending how the body's defenses operates and the reason we do not all suffer from serious self-attack conditions," commented the chair of the Nobel Committee.

The trio's research explain a core question: How does the defense system defend us from countless invaders while leaving our own tissues unharmed?

The body's protection system employs immune cells that search for indicators of infection, even viruses and bacteria it has never encountered.

Such cells utilize sensors—called receptors—that are produced by chance in countless variations.

That gives the defense network the capacity to fight a broad range of threats, but the randomness of the mechanism unavoidably creates white blood cells that may target the host.

Protectors of the Immune System

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

This year's Nobel Prize recognizes the identification of regulatory T-cells—known as the immune system's "security guards"—which patrol the body to disarm other defenders that attack the body's own tissues.

It is known that this process fails in autoimmune diseases such as type-1 diabetes, MS, and RA.

A prize committee added, "These discoveries have established a novel area of investigation and accelerated the creation of innovative treatments, for instance for cancer and autoimmune diseases."

In malignancies, regulatory T-cells block the body from fighting the growth, so studies are focused on lowering their quantity.

For autoimmune diseases, trials are testing boosting T-reg cells so the body is no longer under attack. A comparable method could also be effective in minimizing the risks of organ transplant rejection.

Pioneering Studies

Prof Sakaguchi, from Osaka University, conducted experiments on mice that had their thymus extracted, leading to self-attack conditions.

The researcher demonstrated that introducing immune cells from other mice could stop the illness—suggesting there was a system for blocking defenders from attacking the host.

Mary Brunkow, affiliated with the Institute for Systems Biology in Seattle, and Fred Ramsdell, now at Sonoma Biotherapeutics in San Francisco, were studying an inherited autoimmune disease in mice and humans that resulted in the discovery of a genetic factor critical for how regulatory T-cells operate.

"The groundbreaking work has uncovered how the immune system is controlled by regulatory T cells, preventing it from accidentally targeting the healthy cells," said a prominent physiology specialist.

"This work is a remarkable example of how basic biological research can have broad implications for human health."