Overview
- The JNeurosci study, published Monday, reports that some visual-cortex neurons in hibernating ground squirrels shrink in deep torpor then return to normal within about 90 minutes of arousal.
- Researchers measured an average dendritic regrowth of about 0.75 millimeters, or roughly 65 percent, during the brief inter-torpor arousal period.
- The team compared Golgi-stained neurons from squirrels in deep torpor, brief arousal, and non-hibernating controls to map changes in the primary visual cortex.
- The remodeling was selective, affecting layer 2/3 pyramidal cells but not layer 4 spiny stellate cells, and no lasting differences were seen six months later.
- Authors and reporters link the work to stroke care because torpor slashes oxygen and nutrient supply much like ischemia, though proposed molecular drivers such as increased SUMOylation now require targeted tests.