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This year's Nobel Prize in Physiology or Medicine has been awarded for transformative findings that illuminate how the immune system targets harmful infections while protecting the body's own cells.

Three renowned scientists—from Japan Shimon Sakaguchi and US scientists Mary Brunkow and Fred Ramsdell—share this honor.

The work identified unique "sentinels" within the defense system that remove malfunctioning defense cells capable of harming the organism.

The findings are now paving the way for new therapies for autoimmune diseases and malignancies.

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

Decisive Findings

"The research has been decisive for comprehending how the immune system functions and why we do not all suffer from severe self-attack conditions," commented the head of the award panel.

This trio's research explain a core mystery: How does the immune system protect us from countless infections while leaving our own tissues unharmed?

The body's protection system uses white blood cells that search for signs of disease, including pathogens and bacteria it has never encountered.

Such defenders utilize detectors—known as receptors—that are produced randomly in countless combinations.

That gives the defense network the ability to fight a wide array of invaders, but the randomness of the mechanism unavoidably creates immune cells that can attack the host.

Security Guards of the Body

Scientists earlier understood that a portion of these harmful white blood cells were eliminated in the immune organ—where white blood cells develop.

The latest Nobel Prize recognizes the discovery of regulatory T-cells—described as the body's "security guards"—which patrol the body to neutralize any defenders that assault the body's own tissues.

It is known that this mechanism malfunctions in autoimmune diseases such as type-1 diabetes, multiple sclerosis, and rheumatoid arthritis.

A Nobel panel added, "These discoveries have laid the foundation for a novel area of research and accelerated the development of new treatments, for instance for tumors and immune disorders."

In malignancies, T-regs block the body from fighting the growth, so studies are aimed at reducing their quantity.

In self-attack disorders, trials are testing boosting T-reg cells so the organism is not under attack. A comparable method could also be effective in minimizing the chances of organ transplant failure.

Innovative Studies

Professor Sakaguchi, of a Japanese institution, conducted experiments on mice that had their immune gland removed, leading to self-attack conditions.

The researcher demonstrated that injecting immune cells from healthy animals could prevent the disease—implying there was a system for preventing defenders from harming the body.

Mary Brunkow, from the Institute for Systems Biology in Seattle, and Fred Ramsdell, currently at a biotech firm in a California city, were investigating an genetic autoimmune disease in rodents and humans that led to the discovery of a gene vital for how regulatory T-cells function.

"Their groundbreaking research has revealed how the body's defenses is kept in check by regulatory T cells, preventing it from mistakenly targeting the healthy cells," commented a leading physiology expert.

"This work is a remarkable example of how fundamental biological study can have broad consequences for human health."