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The prestigious award in Physiology or Medicine has been granted for revolutionary findings that clarify how the immune system targets harmful pathogens while protecting the healthy tissues.

Three esteemed scientists—Japan's Shimon Sakaguchi and US scientists Dr. Brunkow and Dr. Ramsdell—share this accolade.

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

These discoveries are now paving the way for new treatments for immune disorders and cancer.

The laureates will divide a prize fund worth 11m SEK.

Decisive Discoveries

"Their work has been essential for understanding how the immune system functions and the reason we don't all suffer from severe self-attack conditions," commented the chair of the award panel.

The trio's studies explain a fundamental mystery: How does the defense system defend us from countless infections while leaving our own tissues unharmed?

The immune system uses immune cells that scan for indicators of infection, including pathogens and germs it has never encountered.

These defenders employ detectors—known as receptors—that are produced by chance in countless combinations.

This gives the immune system the capacity to fight a wide array of threats, but the randomness of the process unavoidably creates immune cells that can target the body.

Security Guards of the Body

Researchers previously knew that some of these harmful white blood cells were eliminated in the immune organ—where immune cells mature.

This year's Nobel Prize recognizes the identification of regulatory T-cells—described as the body's "security guards"—which patrol the body to disarm other immune cells that assault the healthy cells.

We know that this process malfunctions in autoimmune diseases such as type-1 diabetes, MS, and RA.

The Nobel panel stated, "The discoveries have established a new field of investigation and spurred the development of new therapies, for example for cancer and immune disorders."

In cancer, T-regs block the body from fighting the tumor, so research are aimed at lowering their numbers.

For autoimmune diseases, experiments are exploring boosting regulatory T-cells so the body is no longer under attack. A comparable method could also be useful in reducing the risks of organ transplant failure.

Innovative Experiments

Prof Sakaguchi, from Osaka University, conducted tests on mice that had their immune gland removed, leading to autoimmune disease.

The researcher demonstrated that introducing immune cells from other animals could stop the illness—implying there was a system for preventing defenders from harming the host.

Dr. Brunkow, affiliated with the Institute for Systems Biology in a US city, and Fred Ramsdell, currently at a biotech firm in San Francisco, were investigating an inherited immune disorder in rodents and humans that led to the discovery of a gene vital for the way regulatory T-cells function.

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

"The work is a striking example of how basic physiological study can have far-reaching implications for public health."