Researchers at King's College London have identified a previously unknown process called karyoptosis that may explain how brain cells die in Alzheimer's disease and frontotemporal dementia. The mechanism, triggered by toxic protein buildup, causes the cell's nucleus to shrink and disintegrate. Blocking key molecular switches in this pathway could open the door to new treatments that slow or halt neuron loss in dementia.
Scientists at King's College London, working with the UK Dementia Research Institute, have uncovered a previously overlooked cell death mechanism called karyoptosis that may be a major driver of neuron loss in Alzheimer's disease and frontotemporal dementia (FTD). Published in Nature Communications, the study analyzed 3,000 brain cells from 28 patients with FTD or end-stage Alzheimer's, using computational algorithms to map different forms of cell death in the tissue.
The researchers found that toxic protein buildup — a hallmark of many neurodegenerative diseases — destabilizes the outer membrane of a neuron's nucleus, causing it to shrink and eventually break apart. Crucially, they also identified a molecular pathway controlling this process, centered on the interaction between a protein switch called p38 MAP kinase and a structural protein called LaminB1. In lab experiments with rat neurons, blocking this interaction reduced markers of karyoptosis.
By the Numbers
Why it matters: For decades, scientists knew toxic proteins accumulate in Alzheimer's but couldn't fully explain the resulting neuron death. Karyoptosis may be the missing link — and the p38 MAP kinase/LaminB1 interaction is now a concrete therapeutic target that could help slow brain cell loss and buy time for more targeted dementia treatments.
