Alzheimer's drugs & tackling HIV

This episode of The Naked Scientists explores two groundbreaking medical developments: the ongoing debate over the clinical effectiveness of newly approved Alzheimer's drugs, and the remarkable case of a man in Oslo who appears to be cured of HIV. Tara Spires-Jones, a leading neurodegeneration expert, discusses the controversial new analysis suggesting anti-amyloid drugs like donanemab and lecanemab offer only marginal benefits, though she argues the criticism unfairly groups successful and failed trials together. She emphasizes the drugs' ability to slow cognitive decline by an estimated five months, which could be meaningful for patients, and expresses optimism about future treatments targeting earlier stages of Alzheimer’s. Meanwhile, the Oslo patient’s cure—achieved through a bone marrow transplant from his brother, who carried the CCR5 Delta 32 mutation—has led researchers to rethink the mechanism of HIV eradication, suggesting it’s not just the genetic mutation but the complete replacement of the immune system that clears the viral reservoir. The episode also covers the emerging science of the 'estrobilome,' a subset of gut bacteria that recycles estrogen, with industrialized populations showing up to seven times higher recycling capacity than non-industrialized groups, raising concerns about fertility and cancer risks. Finally, Megan Argo explains the Lyrid meteor shower, caused by debris from Comet Thatcher, and offers tips for optimal viewing on the night of April 21–22.