Longevity & AgingCalico's Rare Disease Drug Targets a Cellular Stress Pathway Linked to Brain Aging
Calico Life Sciences has earned FDA Breakthrough Therapy Designation for fosigotifator, a drug targeting the Integrated Stress Response (ISR) in Vanishing White Matter disease, a fatal childhood brain disorder. The ISR is a cellular emergency switch that, when stuck permanently on, drives the protein damage and chronic stress seen in aging brains. By proving this mechanism can be modulated safely in humans, Calico is laying groundwork that could extend to Alzheimer's, ALS, and broader age-related neurodegeneration. This marks arguably the first serious clinical translation of ISRIB research — celebrated in mice — into human medicine, signaling the ISR is graduating from academic hypothesis to genuine therapeutic strategy.
