Counteracting the progressive neurological disability caused by neuronal and axonal loss is the major unmet clinical need in multiple sclerosis therapy. However, the mechanisms underlying irreversible neuroaxonal degeneration in multiple sclerosis and its animal model experimental autoimmune encephalomyelitis (EAE) are not well understood. A long-standing hypothesis holds that the distribution of voltage-gated sodium channels along demyelinated axons contributes to neurodegeneration by increasing neuroaxonal sodium influx and energy demand during CNS inflammation. Here, we tested this hypothesis in vivo by inserting a human gain-of-function mutation in the mouse NaV1.2-encoding gene
Benjamin Schattling, Walid Fazeli, Birgit Engeland, Yuanyuan Liu, Holger Lerche, Dirk Isbrandt, Manuel A. Friese
Enhanced NaV1.2 activity results in increased axonal injury and neuronal energy consumption during EAE.