Microtubule acetylation and impaired axonal transport have been proposed as mechanisms causing amyotrophic lateral sclerosis (ALS). Furthermore, histone deacetylase 6 (HDAC6) is known to play a role in acetylation of α-tubulin, a subunit of microtubules. ACY-738 is an HDAC6 inhibitor that has been reported to slow neuron degeneration in Alzheimer’s disease and ALS models by increasing acetylation of α-tubulin.