Long term survival of chronically demyelinated axons in the taiep rat

Small diameter axons in the dorsal column of taiep rats survive for many months after chronic demyelination, with survival assessed in spinal cord tracts from 1- to 24-month-old animals.

• Why it matters: Neuroaxonal loss in multiple sclerosis drives permanent disability, but the specific role of chronic demyelination in axon demise has been hard to test due to limited long-lived models and uncertain injury localization.
• What they did: Using light and electron microscopy, the study examined chronically demyelinated spinal cord tracts in taiep rats expressing Tubb4a p.A302T highly in oligodendrocytes, spanning 1–24 months.
• The result: Demyelination is linked to significantly increased oligodendroglia density and supernumerary glial cell processes, implying that close axon–glia contact may provide trophic/metabolic support for axon survival.

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