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This year's Nobel Prize in Physiology or Medicine was granted for transformative discoveries that clarify how the immune system attacks dangerous pathogens while protecting the healthy tissues.

A trio of esteemed researchers—from Japan Shimon Sakaguchi and US experts Dr. Brunkow and Fred Ramsdell—received this honor.

Their work identified specialized "sentinels" within the immune system that eliminate malfunctioning immune cells capable of harming the organism.

The discoveries are now enabling new therapies for immune disorders and malignancies.

The laureates will share a prize fund valued at 11m Swedish kronor.

Crucial Findings

"The work has been essential for comprehending how the immune system functions and the reason we do not all suffer from severe self-attack conditions," stated the head of the Nobel Committee.

The team's research explain a core question: How does the immune system protect us from countless infections while leaving our healthy cells intact?

The immune system uses white blood cells that scan for signs of disease, including pathogens and bacteria it has not met before.

Such cells employ sensors—called receptors—that are generated by chance in countless variations.

This provides the defense network the ability to fight a wide array of threats, but the randomness of the mechanism inevitably creates immune cells that can attack the body.

Protectors of the Immune System

Scientists earlier understood that a portion of these problematic white blood cells were destroyed in the thymus—where immune cells develop.

This year's Nobel Prize recognizes the discovery of regulatory T-cells—known as the body's "security guards"—which travel through the body to neutralize other defenders that assault the healthy cells.

We know that this process fails in autoimmune diseases such as juvenile diabetes, MS, and RA.

A prize committee added, "The discoveries have established a new field of research and spurred the creation of new therapies, for example for cancer and autoimmune diseases."

In malignancies, regulatory T-cells prevent the system from attacking the growth, so research are focused on lowering their quantity.

In self-attack disorders, trials are testing boosting T-reg cells so the body is not being harmed. A similar approach could also be effective in minimizing the chances of transplanted organ failure.

Pioneering Studies

Professor Sakaguchi, from Osaka University, conducted tests on rodents that had their immune gland removed, leading to self-attack conditions.

The researcher demonstrated that injecting defense cells from other animals could prevent the disease—implying there was a system for preventing immune cells from attacking the host.

Mary Brunkow, from the a research center in Seattle, and Dr. Ramsdell, currently at Sonoma Biotherapeutics in a California city, were investigating an inherited immune disorder in mice and people that led to the identification of a genetic factor vital for the way T-regs operate.

"Their groundbreaking work has revealed how the body's defenses is controlled by regulatory T cells, stopping it from mistakenly attacking the healthy cells," said a leading biological science expert.

"The research is a striking illustration of how basic physiological study can have far-reaching implications for human health."