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This year's Nobel Prize in Physiology or Medicine was awarded for transformative findings that clarify how the body's defense network attacks dangerous infections while protecting the body's own cells.

A trio of renowned researchers—Japan's Shimon Sakaguchi and American experts Dr. Brunkow and Fred Ramsdell—received this accolade.

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

These findings are now paving the way for new treatments for autoimmune diseases and cancer.

These winners will divide a monetary award worth 11m Swedish kronor.

Crucial Discoveries

"Their work has been essential for comprehending how the immune system functions and why we do not all develop serious autoimmune diseases," commented the head of the Nobel Committee.

This team's studies address a fundamental question: How does the defense system protect us from countless invaders while keeping our healthy cells intact?

Our immune system uses immune cells that search for signs of disease, including viruses and bacteria it has not met before.

Such defenders utilize detectors—known as recognition units—that are produced randomly in countless variations.

That gives the immune system the capacity to fight a broad range of invaders, but the unpredictability of the mechanism inevitably creates immune cells that may target the host.

Protectors of the Immune System

Scientists earlier knew that a portion of these harmful defense cells were eliminated in the thymus—the site where immune cells mature.

This year's Nobel Prize honors the discovery of regulatory T-cells—known as the body's "security guards"—which patrol the body to disarm other defenders that attack the healthy cells.

We know that this process fails in self-attack conditions such as type-1 diabetes, MS, and rheumatoid arthritis.

A prize committee stated, "The discoveries have laid the foundation for a novel area of investigation and spurred the creation of new therapies, for example for cancer and autoimmune diseases."

Regarding cancer, regulatory T-cells prevent the body from attacking the growth, so studies are focused on reducing their quantity.

In self-attack disorders, trials are testing boosting regulatory T-cells so the organism is not being harmed. A similar method could also be useful in reducing the risks of organ transplant rejection.

Pioneering Experiments

Prof Shimon Sakaguchi, of Osaka University, conducted experiments on rodents that had their immune gland removed, causing self-attack conditions.

The researcher showed that introducing defense cells from other animals could stop the disease—suggesting there was a system for blocking defenders from attacking the host.

Dr. Brunkow, affiliated with the a research center in Seattle, and Dr. Ramsdell, currently at Sonoma Biotherapeutics in San Francisco, were studying an inherited immune disorder in rodents and people that led to the discovery of a genetic factor vital for the way T-regs operate.

"The groundbreaking work has revealed how the immune system is kept in check by T-reg cells, stopping it from mistakenly attacking the body's own tissues," commented a leading physiology expert.

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