Alzheimer’s disease and related brain disorders are among the most important medical challenges of our time. As people live longer, the number of patients continues to increase, placing enormous pressure on families, healthcare systems, and society. Current treatments provide only limited benefits, and new approaches are urgently needed.
One of the hallmarks of Alzheimer’s disease is the abnormal deposition of the protein Tau. Normally, Tau acts like the trees of a healthy forest, giving stability and structure to nerve cells. But under disease conditions, Tau changes its structure and becomes unstable. Like dry tinder ready to catch fire, misfolded Tau molecules act as sparks that ignite nearby healthy “trees” and ignite new fires. These sparks represent toxic protein clumps (so-called aggregates) that trigger a chain reaction, leading to the larger ‘fires’ of aggregation spreading from cell to cell. The build-up and multiplication of these toxic aggregates over time is thought to be one of the main drivers of dementia.
Past therapies mainly focused on removing the large “fires” or plaques in the brain. The results were modest and sometimes harmful, showing that tackling only the big flames is not enough. This project set out to understand how the first sparks appear in the form of small aggregates termed oligomers, how they spread through the forest, and how the brain’s natural “firefighters”, so-called molecular chaperones, try to put them out. By using advanced microscopy in living cells, we aimed to create a new framework for understanding Alzheimer’s disease and to pave the way for safer and more effective therapies.
