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This year's prestigious award in Physiology or Medicine was granted for revolutionary discoveries that clarify how the body's defense network attacks dangerous infections while sparing the healthy tissues.

Three renowned scientists—from Japan Prof. Sakaguchi and US experts Mary Brunkow and Fred Ramsdell—received this honor.

Their work uncovered unique "security guards" within the defense system that eliminate malfunctioning immune cells that could harming the body.

The discoveries are now enabling innovative therapies for immune disorders and cancer.

These laureates will share a monetary award worth 11m Swedish kronor.

Crucial Findings

"The work has been decisive for comprehending how the immune system operates and the reason we do not all develop severe self-attack conditions," stated the chair of the Nobel Committee.

This trio's research address a core mystery: How does the immune system defend us from numerous infections while keeping our healthy cells intact?

Our body's protection system uses white blood cells that search for indicators of infection, including pathogens and bacteria it has not met before.

These cells utilize sensors—called receptors—that are produced by chance in countless combinations.

This gives the immune system the capacity to fight a broad range of invaders, but the unpredictability of the process unavoidably creates immune cells that may target the body.

Security Guards of the Immune System

Researchers previously understood that a portion of these harmful white blood cells were destroyed in the immune organ—where white blood cells develop.

This year's Nobel Prize recognizes the discovery of T-reg cells—known as the body's "peacekeepers"—which patrol the system to neutralize other defenders that attack the healthy cells.

It is known that this process malfunctions in autoimmune diseases such as juvenile diabetes, multiple sclerosis, and rheumatoid arthritis.

The prize committee added, "These findings have laid the foundation for a new field of research and spurred the creation of new therapies, for instance for cancer and autoimmune diseases."

In cancer, T-regs prevent the system from attacking the growth, so research are focused on reducing their quantity.

For self-attack disorders, trials are exploring increasing regulatory T-cells so the organism is no longer under attack. A similar method could also be effective in reducing the chances of organ transplant failure.

Innovative Studies

Prof Shimon Sakaguchi, of a Japanese institution, performed experiments on mice that had their thymus removed, causing autoimmune disease.

He demonstrated that injecting immune cells from other mice could prevent the disease—implying there was a system for preventing defenders from attacking the body.

Mary Brunkow, from the Institute for Systems Biology in a US city, and Fred Ramsdell, now at a biotech firm in San Francisco, were investigating an inherited immune disorder in rodents and people that resulted in the discovery of a genetic factor critical for how regulatory T-cells function.

"The groundbreaking work has revealed how the immune system is controlled by T-reg cells, stopping it from accidentally attacking the body's own tissues," commented a leading physiology specialist.

"This work is a remarkable example of how basic biological study can have far-reaching consequences for human health."