Published: 5 October 2025NobelPrize.orgScience & Technology
Significance of Regulatory T Cells Discovery: Nobel Medicine Prize 2025 and Its Impact on Autoimmune Disease Treatment
The 2025 Nobel Prize in Physiology or Medicine recognises a landmark in immunology: the discovery of regulatory T cells (Tregs). Shimon Sakaguchi, a Professor at Osaka University, Japan, first showed in the 1990s that a specific subset of T cells actively suppresses immune responses against self-tissues. This was a paradigm shift, as it proved the immune system has a dedicated 'brake' mechanism.
Mary Brunkow at the Institute for Systems Biology, Seattle, and Fred Ramsdell independently identified the FOXP3 gene as the master regulator of Treg development. Mutations in FOXP3 cause IPEX syndrome (Immune dysregulation, Polyendocrinopathy, Enteropathy, X-linked) in humans, a fatal autoimmune disorder.
This discovery has transformed understanding of immune tolerance and opened therapeutic possibilities including Treg-based cell therapies for organ transplant rejection, type 1 diabetes, inflammatory bowel disease, and cancer immunotherapy. Clinical trials for Treg therapies are now underway globally.
Mains angle
Q: Explain the scientific significance of regulatory T cell discovery recognised by the 2025 Nobel Medicine Prize for autoimmune disease therapeutics.
Answer (50 words): Shimon Sakaguchi, Mary Brunkow and Fred Ramsdell won 2025 Nobel Medicine for discovering regulatory T cells and FOXP3 gene as master regulator of immune tolerance. FOXP3 mutations cause IPEX syndrome. Treg-based therapies now target organ transplant rejection, type 1 diabetes, inflammatory bowel disease and cancer immunotherapy through global clinical trials.
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Linked questionMedium
Which of the following scientists was the first to identify regulatory T cells?
Explanation · Correct answer CShimon Sakaguchi, Professor at Osaka University, Japan, first identified regulatory T cells in the 1990s and showed their crucial role in preventing autoimmune disease. Brunkow and Ramsdell later discovered the FOXP3 gene connection. James Allison won the 2018 Nobel for cancer immunotherapy (checkpoint inhibitors), a different area.
Frequently asked questions
What discovery did the 2025 Nobel Prize in Physiology or Medicine recognise?
The 2025 Nobel Prize in Physiology or Medicine recognised the discovery of regulatory T cells (Tregs), a landmark in immunology.
What did Shimon Sakaguchi show about T cells in the 1990s?
Shimon Sakaguchi, a Professor at Osaka University, Japan, first showed in the 1990s that a specific subset of T cells actively suppresses immune responses against self-tissues. This proved the immune system has a dedicated 'brake' mechanism.
What role did Mary Brunkow and Fred Ramsdell identify for FOXP3?
Mary Brunkow at the Institute for Systems Biology, Seattle, and Fred Ramsdell independently identified the FOXP3 gene as the master regulator of Treg development. Mutations in FOXP3 cause IPEX syndrome in humans, a fatal autoimmune disorder.
Which therapies did the regulatory T cell discovery open up?
It opened therapeutic possibilities including Treg-based cell therapies for organ transplant rejection, type 1 diabetes, inflammatory bowel disease, and cancer immunotherapy. Clinical trials for Treg therapies are now underway globally.
