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The 2025 Nobel prizes: six days that crowned science's breakthrough year

The 2025 Nobel prizes: six days that crowned science's breakthrough year

New Capabilities

From immune tolerance to quantum circuits and economic growth theory—a week that honored discoveries in medicine, physics, chemistry, literature, peace, and economics

December 10th, 2025: Stockholm Awards Ceremony

Overview

The Nobel Assembly kicked off October 2025 by awarding the Medicine Prize to three scientists who discovered the immune system's off-switch—regulatory T cells controlled by the Foxp3 gene. Mary Brunkow and Fred Ramsdell identified the gene in 2001 while studying scurfy mice that died from autoimmune storms. Shimon Sakaguchi had already discovered the cells themselves in 1995. Together, their work explained why our immune systems don't destroy us and opened the door to treatments for everything from diabetes to lupus.

Over the following week, Stockholm announced prizes in physics for quantum circuits you can hold in your hand and chemistry for molecular frameworks with spaces big enough for gases to flow through. Literature went to László Krasznahorkai for his apocalyptic visions, peace to Venezuelan democracy activist Maria Corina Machado, and economics to theorists explaining how creative destruction drives sustained growth. The laureates each received 11 million Swedish kronor, about $1.21 million.

Key Indicators

50M
Americans with autoimmune diseases
20% of U.S. population—conditions the laureates' discoveries help treat
11M SEK
Prize money per award
Approximately $1.21 million split among laureates in each category
6
Nobel Prizes awarded
Medicine, Physics, Chemistry, Literature, Peace, and Economics over 8 days
1995
Sakaguchi's breakthrough year
When he discovered regulatory T cells that prevent autoimmune attacks

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People Involved

Organizations Involved

Timeline

1960 December 2025

14 events Latest: December 10th, 2025 · 6 months ago Showing 8 of 14
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  1. Stockholm Awards Ceremony

    Latest Prize Ceremony

    Over 1,000 guests including Swedish royalty attend Stockholm Concert Hall as laureates receive 11 million SEK prizes.

  2. Economics Nobel: Innovation-Driven Growth

    Prize Announcement

    Joel Mokyr, Philippe Aghion, and Peter Howitt win for theories explaining sustained economic growth through creative destruction and technological progress.

  3. Peace Nobel: Maria Corina Machado

    Prize Announcement

    Venezuelan opposition leader honored for promoting democratic rights and peaceful transition from dictatorship.

  4. Literature Nobel: László Krasznahorkai

    Prize Announcement

    Hungarian author wins for compelling, apocalyptic visions that reaffirm art's power amid terror.

  5. Chemistry Nobel: Molecular Frameworks

    Prize Announcement

    Richard Robson, Susumu Kitagawa, and Omar Yaghi win for developing metal-organic frameworks—molecular constructions with spaces for gas flow.

  6. Physics Nobel: Quantum Circuits

    Prize Announcement

    John Clarke, Michel Devoret, and John Martinis win for demonstrating macroscopic quantum mechanical tunneling in circuits you can hold.

  7. Medicine Nobel: Regulatory T Cells

    Prize Announcement

    Brunkow, Ramsdell, and Sakaguchi win Nobel Prize in Physiology or Medicine for discoveries enabling autoimmune disease treatments.

  8. Cancer Immunotherapy Wins Nobel

    Scientific Recognition

    James Allison and Tasuku Honjo awarded Nobel for checkpoint blockade therapy—parallel breakthrough using immune system to fight cancer.

  9. Crafoord Prize Previews Nobel

    Scientific Recognition

    Ramsdell and Sakaguchi share Crafoord Prize for regulatory T cell discoveries—major award often preceding Nobel recognition.

  10. Foxp3 Controls Regulatory T Cells—The Connection

    Scientific Discovery

    Sakaguchi and other researchers prove Foxp3 gene governs regulatory T cell development, linking earlier discoveries.

  11. Brunkow and Ramsdell Identify Foxp3 Gene

    Scientific Discovery

    Working at Darwin Molecular Corporation, they discover Foxp3 mutation causes fatal autoimmune disease in scurfy mice and IPEX syndrome in humans.

  12. Sakaguchi Discovers Regulatory T Cells

    Scientific Discovery

    Shimon Sakaguchi identifies previously unknown immune cells expressing CD4 and CD25 that prevent autoimmune attacks.

  13. MHC Structure Wins Nobel Prize

    Scientific Recognition

    Benacerraf, Dausset, and Snell awarded Nobel for describing major histocompatibility complexes—how bodies distinguish self from non-self.

  14. Nobel Prize Recognizes Immune Tolerance Discovery

    Scientific Recognition

    MacFarlane Burnet and Peter Medawar win Nobel for discovering acquired immune tolerance—the foundation for later regulatory T cell research.

Historical Context

3 moments from history that rhyme with this story — and how they unfolded.

1945-1960

1960 Nobel Prize: Acquired Immune Tolerance

MacFarlane Burnet and Peter Medawar discovered that the immune system learns to tolerate 'self' tissues—you can train an immune system during development to accept foreign tissue. Medawar showed that mice exposed to cells from another strain as fetuses would later accept skin grafts from that strain. Burnet provided the theoretical framework: the immune system develops tolerance by eliminating self-reactive cells during development.

Then

Explained why organ transplants fail and pointed toward how to prevent rejection.

Now

Laid foundation for transplant medicine and the entire field of immune tolerance research that produced the 2025 laureates' discoveries.

Why this matters now

Burnet and Medawar explained central tolerance—deleting self-reactive immune cells during development. Sakaguchi, Brunkow, and Ramsdell discovered peripheral tolerance—regulatory T cells that patrol the body and suppress autoimmune attacks that escaped central tolerance. Together, they explain how we don't destroy ourselves.

1992-2018

2018 Nobel Prize: Cancer Immunotherapy via Checkpoint Blockade

James Allison and Tasuku Honjo discovered immune checkpoints—CTLA-4 and PD-1—that act as brakes on T cells. They realized blocking these brakes unleashes immune cells to attack tumors. Allison's 1996 work on anti-CTLA-4 antibodies cured cancer in mice. Honjo cloned PD-1 in 1992 and showed it's another checkpoint. Their discoveries led to drugs like ipilimumab and pembrolizumab that have saved hundreds of thousands of cancer patients.

Then

Checkpoint inhibitors became standard treatment for melanoma, lung cancer, and other malignancies.

Now

Revolutionized cancer treatment and created a $50+ billion immunotherapy industry. Side effect: autoimmune complications in 10-20% of patients.

Why this matters now

Allison and Honjo took the brakes off immunity to fight cancer. Sakaguchi, Brunkow, and Ramsdell discovered the brake system itself—regulatory T cells controlled by Foxp3. Both Nobel-winning discoveries manipulate the same fundamental immune tolerance machinery, just in opposite directions: one to attack tumors, one to prevent autoimmunity.

1960-1980

1980 Nobel Prize: Major Histocompatibility Complex

Baruj Benacerraf, Jean Dausset, and George Snell described the major histocompatibility complex (MHC)—the genetic system that lets immune cells distinguish 'self' from 'non-self.' Snell discovered MHC genes control tissue rejection in mice. Dausset found the human equivalent (HLA system). Benacerraf showed MHC determines which antigens trigger immune responses. This explained why transplants between unrelated individuals fail and why some people develop autoimmune diseases.

Then

Enabled tissue typing for transplants and explained genetic susceptibility to autoimmune diseases.

Now

Created the foundation for understanding T cell recognition and immune system specificity, which regulatory T cells regulate.

Why this matters now

MHC explains how T cells recognize targets. Regulatory T cells—the 2025 laureates' discovery—use that same MHC system to police other T cells and prevent autoimmune attacks. Without MHC, you can't have adaptive immunity. Without regulatory T cells, that adaptive immunity destroys you.

Sources

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