2025 has been the most challenging year in the efforts to fight HIV since at least the advent of antiretroviral therapy. In a report on “Overcoming disruption, transforming the AIDS response,” released last week ahead of World AIDS Day on Dec. 1, the Joint United Nations Program on HIV/AIDS (UNAIDS) described “a global system in shock” by sharply reduced funding from the U.S. and other wealthy nations. Scientifically, for now, progress is ongoing.

Researchers from the Chinese Institute for Brain Research, the Chinese Academy of Medical Sciences, and their collaborators have identified adenosine as the driving force behind the rapid, fast-acting antidepressant effects of ketamine and electroconvulsive therapy (ECT). “Our journey into this area of research began over a decade ago, around 2013, when the clinical world was buzzing with excitement about ketamine's remarkably rapid antidepressant effects,” Minmin Luo, co-senior author of the study, told BioWorld.

Stem cells are a promising therapeutic modality to fight aging and age-related disease, speakers at the Bio-Plus Interphex Korea 2025 said. Progress in cell-based longevity medicine is being made, they added, although safety, ethical and regulatory issues are ongoing challenges.

Bio Japan 2025 was abuzz with the news that Japan has once again snagged the Nobel Prize in Physiology or Medicine, with Shimon Sakaguchi winning for his discovery of a subtype of CD4-expressing T cells that affect the immune response. Earlier today, Susumu Kitagawa snatched the second Nobel Prize for Japan, this time in chemistry. Both Nobel Prize winners were professors at Kyoto University.

The Nobel Committee announced today that it has awarded the 2025 Nobel Prize in Physiology or Medicine to three scientists for their discovery of regulatory T cells, which are a critical part of the way the body prevents autoimmune attacks.

Chinese scientists have discovered a common mechanism by which structurally distinct proteins elicit an allergic reaction, showing they cause the formation of pores in epithelial airway cells.

Around 10 million people globally live with the life-threatening human T-cell lymphotropic virus type-1 (HTLV-1), yet it remains a poorly understood disease that currently has no preventative treatments and no cure.

The switch will be flicked today to make the world’s largest dementia-related proteomics dataset freely available to researchers, at the same time as members of the consortium which compiled it publish the proteomics signatures of major neurodegenerative diseases that they uncovered in a first trawl of the data.

Lizards, zebrafish, salamanders and tritons can regrow a tail, a fin, or even an entire limb after amputation. Cut a planarian into pieces, and you will end up with a bunch of them. Researchers at the National Institute of Biological Sciences in Beijing have discovered a genetic switch linked to vitamin A. After activating this pathway, they managed to regenerate the ear pinna of a mouse, an animal that previously lacked this ability.

Using a customized gene editing therapy, researchers at the Children’s Hospital of Philadelphia have reported success in treating an infant with a severe metabolic disorder. Kiran Musunuru, Barry J. Gertz Professor for Translational Research in the University of Pennsylvania’s Perelman School of Medicine, presented the case at the American Society of Gene and Cell Therapy’s 2025 annual meeting. The case study was simultaneously published in The New England Journal of Medicine.