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The Nobel Prize in medical science has been awarded for transformative findings that illuminate how the body's defense network targets dangerous pathogens while protecting the body's own cells.

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

The research identified specialized "security guards" within the defense system that eliminate malfunctioning immune cells capable of harming the body.

These discoveries are now paving the way for new therapies for immune disorders and malignancies.

These winners will share a monetary award valued at 11 million Swedish kronor.

Crucial Findings

"Their research has been essential for understanding how the immune system operates and why we do not all develop severe self-attack conditions," commented the chair of the Nobel Committee.

The team's studies address a fundamental question: In what way does the defense system defend us from numerous invaders while keeping our healthy cells unharmed?

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

Such cells utilize sensors—called recognition units—that are generated randomly in countless combinations.

This provides the immune system the capacity to fight a broad range of invaders, but the unpredictability of the process inevitably creates immune cells that can target the body.

Protectors of the Body

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

This year's Nobel Prize recognizes the discovery of regulatory T-cells—known as the immune system's "peacekeepers"—which travel through the system to disarm other immune cells that attack the body's own tissues.

We know that this mechanism fails in self-attack conditions such as juvenile diabetes, multiple sclerosis, and RA.

The prize committee stated, "The findings have established a new field of research and accelerated the creation of new therapies, for instance for cancer and immune disorders."

In malignancies, regulatory T-cells prevent the body from fighting the tumor, so research are focused on reducing their numbers.

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

Pioneering Studies

Prof Sakaguchi, from Osaka University, performed tests on mice that had their thymus removed, leading to autoimmune disease.

He demonstrated that introducing defense cells from other animals could prevent the illness—implying there was a system for blocking defenders from attacking the host.

Dr. Brunkow, affiliated with the a research center in a US city, and Fred Ramsdell, currently at a biotech firm in San Francisco, were investigating an inherited immune disorder in rodents and people that resulted in the identification of a gene critical for how T-regs function.

"The groundbreaking work has revealed how the immune system is controlled by regulatory T cells, stopping it from mistakenly targeting the healthy cells," said a leading physiology specialist.

"The research is a striking example of how fundamental biological study can have broad implications for human health."