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This year's Nobel Prize in medical science was granted for transformative discoveries that illuminate how the body's defense network targets harmful pathogens while sparing the body's own cells.

A trio of renowned scientists—from Japan Shimon Sakaguchi and American experts Mary Brunkow and Fred Ramsdell—share this honor.

Their research uncovered unique "security guards" within the immune system that remove rogue immune cells capable of harming the body.

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

These laureates will divide a monetary award worth 11m SEK.

Crucial Findings

"Their research has been decisive for understanding how the immune system functions and why we do not all suffer from serious self-attack conditions," stated the chair of the award panel.

This team's research address a fundamental mystery: In what way does the immune system protect us from numerous infections while leaving our healthy cells intact?

Our immune system uses white blood cells that scan for signs of disease, even viruses and bacteria it has never encountered.

These defenders utilize sensors—known as recognition units—that are generated randomly in countless variations.

This gives the immune system the ability to fight a wide array of threats, but the randomness of the mechanism inevitably produces white blood cells that can target the body.

Security Guards of the Body

Researchers previously understood that some of these problematic defense cells were eliminated in the thymus—where white blood cells mature.

The latest award recognizes the discovery of T-reg cells—described as the body's "peacekeepers"—which patrol the system to disarm any defenders that attack the healthy cells.

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

A prize committee stated, "These discoveries have established a new field of investigation and accelerated the development of innovative therapies, for example for tumors and autoimmune diseases."

In cancer, T-regs block the system from fighting the growth, so studies are focused on reducing their numbers.

In autoimmune diseases, experiments are exploring increasing regulatory T-cells so the body is not under attack. A similar method could also be effective in minimizing the risks of organ transplant rejection.

Innovative Experiments

Professor Sakaguchi, from a Japanese institution, performed tests on rodents that had their thymus removed, leading to self-attack conditions.

The researcher demonstrated that injecting defense cells from healthy animals could prevent the illness—implying there was a mechanism for blocking defenders from harming the host.

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 studying an genetic immune disorder in rodents and humans that resulted in the identification of a gene vital for how regulatory T-cells function.

"The pioneering work has uncovered how the immune system is controlled by regulatory T cells, stopping it from accidentally targeting the body's own tissues," commented a leading physiology specialist.

"This work is a remarkable illustration of how basic physiological study can have broad consequences for public health."