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The Nobel Prize in Physiology or Medicine has been awarded for transformative discoveries that clarify how the body's defense network targets harmful infections while sparing the body's own cells.

Three esteemed scientists—from Japan Prof. Sakaguchi and American scientists Dr. Brunkow and Fred Ramsdell—share this accolade.

The research uncovered unique "sentinels" within the defense system that eliminate rogue defense cells that could attacking the body.

These discoveries are now enabling new treatments for autoimmune diseases and malignancies.

These laureates will divide a prize fund valued at 11 million SEK.

Crucial Discoveries

"Their work has been essential for understanding how the body's defenses operates and the reason we do not all suffer from serious autoimmune diseases," stated the chair of the Nobel Committee.

This trio's studies address a fundamental mystery: How does the immune system defend us from numerous invaders while keeping our own tissues intact?

The immune system employs immune cells that scan for signs of infection, including viruses and bacteria it has never encountered.

These cells utilize detectors—known as receptors—that are produced by chance in countless variations.

That gives the immune system the capacity to fight a wide array of invaders, but the randomness of the process unavoidably creates immune cells that may target the body.

Security Guards of the Body

Researchers previously knew that some of these problematic white blood cells were destroyed in the immune organ—where white blood cells develop.

This year's award honors the discovery of regulatory T-cells—described as the immune system's "security guards"—which patrol the body to disarm other immune cells that attack the body's own tissues.

We know that this mechanism fails in autoimmune diseases such as juvenile diabetes, MS, and RA.

A Nobel panel stated, "The findings have established a novel area of investigation and spurred the creation of new treatments, for example for cancer and immune disorders."

Regarding cancer, regulatory T-cells block the system from fighting the growth, so research are focused on reducing their quantity.

In self-attack disorders, experiments are testing increasing T-reg cells so the body is no longer being harmed. A comparable method could also be useful in reducing the chances of organ transplant rejection.

Pioneering Experiments

Prof Sakaguchi, from Osaka University, conducted experiments on rodents that had their thymus removed, leading to self-attack conditions.

The researcher demonstrated that injecting defense cells from other mice could stop the illness—suggesting there was a system for preventing defenders from harming the host.

Dr. Brunkow, from the a research center in a US city, and Fred Ramsdell, currently at a biotech firm in San Francisco, were investigating an genetic immune disorder in rodents and humans that led to the identification of a gene vital for the way T-regs function.

"The groundbreaking work has uncovered how the body's defenses is kept in check by regulatory T cells, preventing it from mistakenly attacking the healthy cells," commented a leading physiology expert.

"The work is a remarkable illustration of how fundamental physiological research can have broad consequences for human health."