title: A randomized, placebo-controlled trial of the benzoquinone idebenone in a mouse model of OPA1-related dominant optic atrophy reveals a limited therapeutic effect on retinal ganglion cell dendropathy and visual function.
abstract: Dominant optic atrophy (DOA) arises from mutations in the OPA1 gene that promotes fusion of the inner mitochondrial membrane and plays a role in maintaining ATP levels. Patients display optic disc pallor, retinal ganglion cell (RGC) loss and bilaterally reduced vision. We report a randomized, placebo-controlled trial of idebenone at 2000 mg/kg/day in 56 Opa1 mutant mice (B6;C3-Opa1(Q285STOP)), with RGC dendropathy and visual loss, and 63 wildtype mice. We assessed cellular responses in the retina, brain and liver and RGC morphology, by diolistic labeling, Sholl analysis and quantification of dendritic morphometric features. Vision was assessed by optokinetic responses. ATP levels were raised by 0.57 nmol/mg (97.73%, p=0.035) in brain from idebenone-treated Opa1 mutant mice, but in the liver there was an 80.35% (p=0.011) increase in oxidative damage. NQO1 expression in Opa1 mutant mice was reduced in the brain (to 30.5%, p=0.002) but not in retina, and neither expression level was induced by idebenone. ON-center RGCs failed to show major recovery, other than improvements in secondary dendritic length (by 53.89%, p=0.052) and dendritic territory (by 2.22 × 10(4) μm(2) or 90.24%, p=0.074). An improvement in optokinetic response was observed (by 12.2 ± 3.2s, p=0.003), but this effect was not sustained over time. OFF-center RGCs from idebenone-treated wildtype mice showed shrinkage in total dendritic length by 2.40 mm (48.05%, p=0.025) and a 47.37% diminished Sholl profile (p=0.029). Visual function in wildtype idebenone-treated mice was impaired (2.9 fewer head turns than placebo, p=0.007). Idebenone appears largely ineffective in protecting Opa1 heterozygous RGCs from dendropathy. The detrimental effect of idebenone in wildtype mice has not been previously observed and raises some concerns.
authors.affiliation: School of Optometry and Vision Sciences, Cardiff University, Maindy Road, Cardiff CF24 4HQ, United Kingdom.
authors.forename: T G
authors.initials: TG
authors.lastname: Smith
authors.affiliation: School of Optometry and Vision Sciences, Cardiff University, Maindy Road, Cardiff CF24 4HQ, United Kingdom.
authors.forename: S
authors.initials: S
authors.lastname: Seto
authors.affiliation: Ipswich Hospital NHS Trust, Heath Road, Ipswich IP4 5PD, United Kingdom.
authors.forename: P
authors.initials: P
authors.lastname: Ganne
authors.affiliation: School of Optometry and Vision Sciences, Cardiff University, Maindy Road, Cardiff CF24 4HQ, United Kingdom; Cardiff Eye Unit, University Hospital Wales, Heath Park, Cardiff CF14 4XN, United Kingdom. Electronic address: VotrubaM@cardiff.ac.uk.
authors.forename: M
authors.initials: M
authors.lastname: Votruba
mesh_terms: D000818:Animals; D000975:Antioxidants / Q000494:pharmacology*; D015153:Blotting, Western; D003712:Dendrites / Q000473:pathology; D004195:Disease Models, Animal; D005260:Female; D020558:GTP Phosphohydrolases / Q000235:genetics; D007150:Immunohistochemistry; D008297:Male; D051379:Mice; D008817:Mice, Mutant Strains; D029241:Optic Atrophy, Autosomal Dominant / Q000473:pathology*; D011897:Random Allocation; D012165:Retinal Ganglion Cells / Q000187:drug effects* / Q000473:pathology; D014451:Ubiquinone / Q000031:analogs & derivatives* / Q000494:pharmacology; D014792:Visual Acuity / Q000187:drug effects*
chemical_list: D000975:Antioxidants; D014451:Ubiquinone; D020558:GTP Phosphohydrolases; C498809:Opa1 protein, mouse; C036619:idebenone
keywords: NQO1; OPA1; dominant optic atrophy; idebenone; mitochondria; retinal ganglion cell