For five decades, the University of California, San Francisco (UCSF) has been recognized as a leading institution in scientific research, with its faculty members earning six Nobel Prizes in physiology or medicine since the award’s inception in 1901. This achievement places UCSF among the top U.S. medical schools for Nobel laureates.
The annual Nobel Prize in physiology or medicine honors scientists whose work has had a lasting impact on medicine and human health. As this year’s Nobel announcements approach, UCSF is reflecting on some of the significant discoveries made by its researchers.
David Julius, Ph.D., a professor of physiology at UCSF, was awarded the 2021 Nobel Prize for his research into how humans sense pain, heat, and touch. Julius explored natural substances such as tarantula toxins and capsaicin—the compound that gives chili peppers their spiciness—to understand how these produce sensations of pain and temperature. His findings revealed that certain proteins play a central role in sensory pathways within the nervous system. “Science is a lot like real estate: It’s about location, location, location,” Julius said after receiving his prize.
Julius’ work provided new insight into pain at the molecular level and opened possibilities for developing safer pain treatments that are not addictive.
Another notable UCSF discovery came from Shinya Yamanaka, M.D., Ph.D., an anatomy professor who found a way to reprogram mature cells to become pluripotent—meaning they can develop into almost any type of cell. In 2007, Yamanaka demonstrated that introducing just a few genes could return mature cells to this versatile state. His research has led to advances in studying diseases such as Alzheimer’s and leukemia and holds promise for future therapies.
Elizabeth Blackburn, Ph.D., professor of biochemistry and biophysics at UCSF, identified telomeres—protective end caps on chromosomes—and explained their role in safeguarding genetic information during cell division. Her work clarified how telomere length influences cellular aging and cancer growth. The study of telomeres continues to drive new approaches to cancer treatment and understanding aging processes.
In 1982, Stanley Prusiner, M.D., professor of neurology at UCSF, discovered prions—a previously unknown class of infectious proteins responsible for diseases like Kuru and Creutzfeldt–Jakob disease. These misfolded proteins cause normal brain proteins to change shape abnormally as well, resulting in neurodegeneration over time. Since then, researchers have expanded on Prusiner’s work by identifying other prion-like mechanisms involved in conditions such as Parkinson’s disease and Alzheimer’s disease.
The origins of cancer became clearer thanks to former UCSF Chancellor J. Michael Bishop and colleague Harold E. Varmus. Their research built upon studies involving Rous sarcoma virus—a virus causing cancer in chickens—and established that normal cells contain genes capable of becoming oncogenes when mutated or activated abnormally. This discovery shifted scientific understanding by showing that cancer can originate from changes within healthy cells themselves rather than external invaders.
Their findings paved the way for modern targeted cancer therapies—including drugs developed specifically for cancers driven by particular oncogenes.
UCSF continues to be recognized internationally for contributions that have shaped fundamental areas of biology and medicine through decades of Nobel Prize-winning research.
