Three Scientists Win 2025 Nobel Prize for Immune Research

Three Scientists Win 2025 Nobel Prize for Immune Research
Above: (L-R) The portraits of Mary E. Brunkow, Fred Ramsdell and Shimon Sakaguchi. Image credit: Claudio Bresciani/TT NEWS AGENCY/AFP/Getty Images

The Facts

  • Mary E. Brunkow, Fred Ramsdell and Shimon Sakaguchi received the 2025 Nobel Prize in Physiology or Medicine on Monday for their discoveries concerning peripheral immune tolerance, which prevents the immune system from attacking the body's own tissues.
  • Sakaguchi discovered regulatory T cells in 1995, while Brunkow and Ramsdell identified the Foxp3 gene mutation in 2001. Sakaguchi later linked these findings to show how the gene controls the development of regulatory T cells.
  • Regulatory T cells function as "security guards" that suppress overreactive immune responses, helping to explain why most people do not develop serious autoimmune diseases, such as type 1 diabetes or rheumatoid arthritis.

Sources Split


The Spin


Narrative A

The 2025 Nobel Prize in Medicine is a monumental breakthrough that will revolutionize health care. These three scientists discovered regulatory T cells and the Foxp3 gene, thereby solving the mystery of how the immune system prevents its own body from being attacked. Their work is already spurring life-saving treatments for cancer, autoimmune diseases and transplant medicine.

Narrative B

The Nobel Prizes spotlight transformative discoveries, shaping our view of scientific genius. Yet, they often celebrate only narrow slices of science while ignoring vast fields like ecology, climate and geology that are equally important. The awards systematically exclude hundreds of researchers who contribute to discoveries, recognizing only lab heads. This creates harmful bias that frequently overlooks women and people of color.


Metaculus Prediction

© 2026 Improve the News Foundation. All rights reserved.Version 7.18.2

© 2026 Improve the News Foundation.

All rights reserved.

Version 7.18.2