TDP-43 Protein Loss Linked to Neurological Disease

A research team led by Rosa Chiara Paolicelli at the Department of Biomedical Sciences at the University of Lausanne (Unil) has identified a novel role for the TDP-43 protein in regulating microglial function, the brain's resident immune cells. Published in *Nature Neuroscience*, their study reveals that the absence of TDP-43 in microglia disrupts their ability to maintain brain health, potentially contributing to the progression of neurological disorders such as Alzheimer’s disease and amyotrophic lateral sclerosis (ALS). This discovery sheds light on a previously underappreciated mechanism linking protein dysfunction to neuroinflammation and disease pathology.

The study demonstrates that TDP-43, known for its role in RNA processing, is critical for sustaining microglial metabolism and immune responses. Using mouse models and human postmortem brain tissue, the team observed that TDP-43 deficiency in microglia leads to impaired clearance of cellular debris and excessive inflammation, creating a toxic environment for neurons. These findings suggest that therapeutic strategies targeting TDP-43 pathways in microglia could offer new avenues for treating neurodegenerative conditions, where immune dysfunction is increasingly recognized as a key driver of disease. The research underscores the complex interplay between protein homeostasis and immune regulation in the brain.