New Brain Cell Death Mechanism Found in Alzheimer's
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- King's College London researchers, working with the UK Dementia Research Institute, identified karyoptosis as a previously overlooked mechanism of brain cell death in Alzheimer's disease and frontotemporal dementia (FTD).
- The study, published in Nature Communications, analyzed 3,000 brain cells from 28 people with FTD or end-stage Alzheimer's and found karyoptosis in 35% of frontal cortex cells from Alzheimer's patients versus just 15% in healthy older adults.
- Toxic protein buildup destabilizes the nuclear membrane, triggering a cascade driven by the kinase p38 MAP kinase interacting with the protein LaminB1, causing the nucleus to shrivel and ultimately break apart.
- In lab experiments on rat neurons, blocking the p38 MAP kinase / LaminB1 interaction reduced markers of karyoptosis — a finding the team calls the culmination of a 10-year research arc at King's.
- Dr. Manolis Fanto, Reader in Functional Genomics at King's, said targeting that interaction may slow cell death and 'buy time for more pinpointed therapies' against specific neurodegenerative diseases.
- The research was funded by Alzheimer's Research UK and the Biotechnology and Biological Sciences Research Council; the team's stated next step is developing ways to selectively target the p38 MAP kinase / LaminB1 interaction in humans.
Why it matters: The p38 MAP kinase / LaminB1 pathway gives drug developers a concrete molecular target that didn't previously exist for halting neuron loss, and the researchers' next goal is translating to humans an intervention that already reduced karyoptosis markers in rat neurons. For Alzheimer's and FTD patients, a therapy that interrupts cell death directly — rather than just clearing toxic proteins — represents a fundamentally different therapeutic angle than current approaches.
