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The Nobel Prize in medical science was awarded for revolutionary discoveries that clarify how the immune system targets dangerous infections while sparing the healthy tissues.

A trio of renowned scientists—Japan's Shimon Sakaguchi and American scientists Mary Brunkow and Fred Ramsdell—share this accolade.

Their work uncovered specialized "security guards" within the defense system that eliminate rogue defense cells capable of harming the body.

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

These laureates will divide a monetary award worth 11 million Swedish kronor.

Crucial Findings

"The research has been essential for understanding how the body's defenses functions and the reason we don't all develop serious self-attack conditions," stated the chair of the Nobel Committee.

This team's research address a fundamental mystery: In what way does the defense system defend us from countless infections while leaving our own tissues intact?

The body's protection system uses immune cells that scan for indicators of disease, even pathogens and bacteria it has not met before.

Such defenders employ detectors—called recognition units—that are produced by chance in a vast number of variations.

This provides the immune system the ability to combat a wide array of invaders, but the unpredictability of the mechanism inevitably creates immune cells that can attack the body.

Protectors of the Immune System

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

The latest award honors the identification of regulatory T-cells—described as the body's "peacekeepers"—which travel through the body to disarm any defenders that attack the body's own tissues.

It is known that this mechanism fails in autoimmune diseases such as juvenile diabetes, multiple sclerosis, and RA.

The prize committee added, "These discoveries have laid the foundation for a novel area of investigation and spurred the creation of new treatments, for example for tumors and immune disorders."

In malignancies, T-regs block the system from fighting the tumor, so research are focused on lowering their quantity.

For autoimmune diseases, experiments are exploring boosting regulatory T-cells so the body is no longer under attack. A similar method could also be useful in minimizing the chances of organ transplant rejection.

Pioneering Experiments

Professor Shimon Sakaguchi, from a Japanese institution, performed tests on rodents that had their immune gland removed, causing self-attack conditions.

The researcher showed that injecting immune cells from other animals could prevent the illness—implying there was a system for blocking defenders from harming the host.

Mary Brunkow, from the a research center in a US city, and Dr. Ramsdell, currently at a biotech firm in a California city, were studying an genetic immune disorder in rodents and people that led to the identification of a gene critical for the way regulatory T-cells operate.

"The groundbreaking research has uncovered how the immune system is controlled by T-reg cells, preventing it from accidentally attacking the body's own tissues," commented a prominent physiology expert.

"The research is a striking illustration of how fundamental physiological research can have broad consequences for public health."