Zebrafish study reveals brain cells can regenerate throughout life
Researchers found that cerebellar Purkinje cells—critical for movement and coordination—can be completely replaced even in adulthood, challenging decades of neuroscience dogma. The discovery opens pathways for treating neurological diseases and could reshape how the pharmaceutical industry approaches brain cell damage.
Originaltitel: Lifelong regeneration of cerebellar Purkinje cells after induced cell ablation in zebrafish
Zebrafish have an impressive capacity to regenerate neurons in the central nervous system. However, regeneration of the principal neuron of the evolutionary conserved cerebellum, the Purkinje cell (PC), is believed to be limited to developmental stages based on invasive lesions. In contrast, non-invasive cell type specific ablation by induced apoptosis closer represents processes of neurodegeneration. We demonstrate that the ablated larval PC population entirely recovers in number, quickly reestablishes electrophysiological properties and properly integrates into circuits to regulate cerebellum-controlled behavior. PC progenitors are present in larvae and adults, and PC ablation in adult cerebelli results in an impressive PC regeneration of different PC subtypes able to restore behavioral impairments. Interestingly, caudal PCs are more resistant to ablation and regenerate more efficiently, suggesting a rostro-caudal pattern of de- and regeneration properties. These findings demonstrate that the zebrafish cerebellum is able to regenerate functional PCs during all stages of the animal’s life.