"Because it has not even been clear that dendrites can regenerate, it's a complete open question about what might be involved in that process. ... For example, in the case of stroke, when a region of the brain suffers blood loss, dendrites on brain cells are damaged and can be repaired only if blood loss is very brief.

What happens when dendrites are damaged?

They found that events within the neuron itself drive the resulting dendrite spine loss and hyper-excitability. Signals originating at the site of injury move rapidly back along the remaining portion of the axon to the neuronal soma and nucleus, triggering a new pattern of gene activity.

Do dendrites regenerate?

Cutting off the dendrites from nerve cells in fruit flies revealed that they can regenerate.