advertisement
Abstract #118799 Published in IGR 24-4
Optineurin-facilitated axonal mitochondria delivery promotes neuroprotection and axon regeneration
Liu D; Webber HC; Bian F; Xu Y; Prakash M; Feng X; Yang M; Yang H; You IJ; Li L; Liu P; Huang H; Chang CY; Liu L; Shah SH; Torre A; Welsbie DS; Sun Y; Duan X; Goldberg JL; Braun M; Braun M; Lansky Z; Hu YbioRxiv : the preprint server for biology 2024; 0:
Optineurin (OPTN) mutations are linked to amyotrophic lateral sclerosis (ALS) and normal tension glaucoma (NTG), but a relevant animal model is lacking, and the molecular mechanisms underlying neurodegeneration are unknown. We found that OPTN C-terminus truncation (OPTN∆C) causes late-onset neurodegeneration of retinal ganglion cells (RGCs), optic nerve (ON), and spinal cord motor neurons, preceded by a striking decrease of axonal mitochondria. Surprisingly, we discover that OPTN directly interacts with both microtubules and the mitochondrial transport complex TRAK1/KIF5B, stabilizing them for proper anterograde axonal mitochondrial transport, in a C-terminus dependent manner. Encouragingly, overexpressing OPTN/TRAK1/KIF5B reverses not only OPTN truncation-induced, but also ocular hypertension-induced neurodegeneration, and promotes striking ON regeneration. Therefore, in addition to generating new animal models for NTG and ALS, our results establish OPTN as a novel facilitator of the microtubule-dependent mitochondrial transport necessary for adequate axonal mitochondria delivery, and its loss as the likely molecular mechanism of neurodegeneration.
Spencer Center for Vision Research, Department of Ophthalmology, Byers Eye Institute at Stanford University School of Medicine, Palo Alto, CA 94304, USA.
Full article