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This year's prestigious award in Physiology or Medicine has been granted for revolutionary discoveries that illuminate how the body's defense network targets dangerous pathogens while sparing the body's own cells.

Three renowned researchers—Japan's Prof. Sakaguchi and American experts Dr. Brunkow and Fred Ramsdell—share this honor.

Their research identified specialized "security guards" within the immune system that remove rogue defense cells capable of harming the body.

These findings are now paving the way for innovative treatments for immune disorders and malignancies.

These winners will share a prize fund worth 11 million Swedish kronor.

Crucial Discoveries

"The research has been essential for understanding how the body's defenses functions and the reason we do not all suffer from severe self-attack conditions," stated the chair of the Nobel Committee.

This team's studies address a fundamental question: In what way does the immune system defend us from countless invaders while leaving our healthy cells intact?

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

These defenders utilize sensors—known as receptors—that are produced randomly in a vast number of combinations.

That gives the immune system the ability to combat a broad range of invaders, but the randomness of the process inevitably produces immune cells that may attack the body.

Protectors of the Immune System

Scientists earlier knew that a portion of these problematic defense cells were destroyed in the thymus—the site where immune cells develop.

This year's Nobel Prize honors the discovery of T-reg cells—described as the body's "security guards"—which patrol the body to disarm other immune cells that assault the body's own tissues.

It is known that this process malfunctions in self-attack conditions such as type-1 diabetes, MS, and rheumatoid arthritis.

A Nobel panel added, "These discoveries have laid the foundation for a new field of investigation and accelerated the creation of new treatments, for instance for tumors and immune disorders."

In cancer, regulatory T-cells prevent the body from attacking the growth, so studies are aimed at reducing their numbers.

For autoimmune diseases, experiments are testing increasing T-reg cells so the body is not under attack. A comparable approach could also be useful in minimizing the chances of transplanted organ failure.

Innovative Studies

Prof Shimon Sakaguchi, of Osaka University, performed experiments on rodents that had their thymus extracted, leading to autoimmune disease.

The researcher showed that injecting defense cells from other mice could prevent the illness—suggesting there was a system for preventing defenders from attacking the host.

Mary Brunkow, from the Institute for Systems Biology in a US city, and Dr. Ramsdell, currently at a biotech firm in San Francisco, were investigating an genetic autoimmune disease in rodents and humans that led to the identification of a genetic factor 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, preventing it from mistakenly targeting the healthy cells," commented a prominent biological science specialist.

"This work is a remarkable illustration of how basic physiological study can have far-reaching consequences for public health."