How Brain Cells Affect Balance in Aged Mice

The cerebellum, a crucial part of the brain, plays a significant role in balance, gaze stability, and spatial orientation by processing various sensory signals and motor commands. Within this region, certain brain cells called unipolar brush cells (UBCs) are abundant. UBCs receive direct and indirect signals from the vestibular system, which is responsible for balance. Each UBC can activate many other brain cells, potentially aiding in balance-related functions. Previous studies have hinted at UBCs' role in motor functions, but their impact on balance, especially in older mice, was uncertain. Scientists tested this by temporarily disrupting UBC activity in mice using a chemical method. They found that aged mice (older than 6 months) performed worse on balance tasks and showed altered swimming behaviors, which are linked to balance issues. This effect was not seen in younger mice (7 weeks old). Therefore, it seems that UBCs are vital for maintaining balance and vestibular functions in aged mice.