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Finding immune cells that stop a body from attacking itself wins medicine Nobel

The 2025 prize goes to 3 researchers who ID’d T-regs and their role in autoimmune disease

Line sketches of the three winners of the 2025 Nobel Prize in physiology and medicine from left to right: Mary Brunkow, Fred Ramsdell, Shimon Sakaguchi, The trio won for discovering a type of immune cell.

Mary Brunkow (left), Fred Ramsdell (middle) and Shimon Sakaguchi (right) have won the Nobel Prize in physiology or medicine for discovering regulatory T cells, which keep the immune system from attacking the body.

Niklas Elmehed © Nobel Prize Outreach

By Tina Hesman Saey

Read another version of this article at Science News Explores

Work on peacemakers in the immune system won the 2025 Nobel Prize in physiology or medicine.