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The Nobel Prize in Physiology or Medicine has been granted for transformative discoveries that illuminate how the body's defense network targets harmful infections while sparing the body's own cells.

A trio of esteemed scientists—from Japan Prof. Sakaguchi and American experts Dr. Brunkow and Fred Ramsdell—received this accolade.

Their work uncovered specialized "sentinels" within the defense system that eliminate rogue defense cells capable of harming the organism.

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

The laureates will share a monetary award valued at 11m SEK.

Decisive Findings

"The research has been essential for comprehending how the immune system operates and the reason we do not all suffer from severe autoimmune diseases," stated the head of the award panel.

The team's studies address a fundamental question: In what way does the defense system defend us from countless infections while leaving our healthy cells intact?

The immune system uses immune cells that search for signs of disease, including pathogens and germs it has never encountered.

These defenders utilize detectors—known as receptors—that are produced randomly in countless variations.

This gives the immune system the capacity to fight a broad range of invaders, but the unpredictability of the process inevitably creates white blood cells that may target the body.

Security Guards of the Body

Scientists previously understood that some of these harmful white blood cells were destroyed in the thymus—where white blood cells develop.

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

We know that this mechanism fails in self-attack conditions such as juvenile diabetes, MS, and rheumatoid arthritis.

The prize committee added, "The findings have laid the foundation for a novel area of research and accelerated the creation of innovative therapies, for example for tumors and autoimmune diseases."

In cancer, regulatory T-cells prevent the body from fighting the growth, so research are focused on reducing their quantity.

In self-attack disorders, experiments are exploring increasing T-reg cells so the organism is no longer being harmed. A similar approach could also be effective in reducing the risks of transplanted organ rejection.

Innovative Studies

Prof Sakaguchi, of a Japanese institution, performed experiments on mice that had their immune gland extracted, causing autoimmune disease.

The researcher demonstrated that injecting defense cells from other animals could prevent the disease—suggesting there was a mechanism for blocking defenders from attacking the body.

Dr. Brunkow, from the Institute for Systems Biology in a US city, and Fred Ramsdell, now at a biotech firm in a California city, were investigating an genetic autoimmune disease in mice and people that resulted in the identification of a gene vital for the way T-regs function.

"Their pioneering research has uncovered how the immune system is controlled by regulatory T cells, stopping it from mistakenly attacking the body's own tissues," said a prominent physiology specialist.

"The research is a remarkable illustration of how fundamental biological research can have broad implications for public health."