2025 Nobel Prize in Medicine Awarded for Pioneering Research on Immune System Regulation

The 2025 Nobel Prize in Physiology or Medicine has been awarded to American scientists Mary E. Brunkow and Fred Ramsdell, along with Japanese researcher Shimon Sakaguchi, for their groundbreaking discoveries related to peripheral immune tolerance. Their work uncovered how regulatory T-cells control the immune system, preventing it from attacking the body's own tissues and thus protecting against autoimmune diseases.

According to Olle Kämpe, chair of the Nobel Committee, their research has been crucial in enhancing the understanding of immune system function and why severe autoimmune diseases do not develop in most people. Sakaguchi’s seminal discovery in 1995 identified a novel class of immune cells responsible for protecting against autoimmunity. Brunkow and Ramsdell further advanced this in 2001 by pinpointing a genetic mutation in the Foxp3 gene linked to autoimmune disorders such as IPEX disease.

Over 200 clinical studies are now underway building on these foundational findings, which hold promise for improved transplant procedures and treatments for autoimmune diseases. The prize of 11 million SEK will be shared among the laureates, although only Sakaguchi has been reached by the Nobel committee so far. Sakaguchi expressed gratitude and honor upon receiving the news.

This award marks a significant milestone in immunology and opens new avenues for preventing and treating immune-related illnesses. It is the first Nobel Prize announced during the 2025 Nobel week festivities in Sweden, with further prizes to follow in physics, chemistry, literature, peace, and economics.