Fig. 1. Bexarotene promotes PPARδ activation to ameliorate the neurotoxicity of mutant huntingtin. Bexarotene promotes PPARδ activation to ameliorate the.

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 Dominant neurodegenerative disease  Polyglutamine repeat expansions (CAG, codon, Q) in exon 1 of huntingtin gene (htt). Usually >35 CAG repeats. 

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Fig. 1. Bexarotene promotes PPARδ activation to ameliorate the neurotoxicity of mutant huntingtin. Bexarotene promotes PPARδ activation to ameliorate the neurotoxicity of mutant huntingtin. (A) We measured 3x–PPAR response element luciferase reporter activity in primary cortical neurons from WT control mice or bacterial artificial chromosome transgenic Huntington’s disease (BAC-HD) mice cotransfected with Renilla luciferase vector and treated with bexarotene (500 nM), GW501516 (100 nM), or vehicle. Peroxisome proliferator–activated receptor δ (PPARδ) activation in BAC-HD mouse neurons was repressed at baseline compared to wild-type (WT) mouse neurons. **P < 0.01, Student’s t test. Bexarotene and GW501516 treatment promoted PPARδ activation in BAC-HD mouse neurons. **P < 0.01, analysis of variance (ANOVA) with post-hoc Tukey test. n = 3 biological replicates; n = 3 technical replicates. Results were normalized to WT mouse neurons at baseline. (B) Mitochondrial membrane potential of primary cortical neurons from WT and BAC-HD mice, treated with vehicle or bexarotene (500 nM), was determined from the ratio of mitochondrial to cytosolic JC-1 fluorescence. *P < 0.05, Student’s t test. n = 3 biological replicates; n = 3 technical replicates. Results were normalized to WT mouse neurons at baseline. Similar results were obtained using tetramethylrhodamine methyl ester (TMRM) as the fluorescent probe (fig. S1B). (C) We quantified active caspase-3 immunostaining of primary cortical neurons from WT and BAC-HD mice, treated with vehicle or bexarotene (500 nM) for 24 hours and H2O2 (25 μM) for 4 hours. *P < 0.05, **P < 0.01, Student’s t test. n = 3 biological replicates; 30 to 50 cells were counted per experiment. (D) Mitochondrial membrane potential was measured in BAC-HD mouse primary cortical neurons, transfected with the indicated short hairpin RNA (shRNA) expression vector (control = scrambled shRNA), and treated with vehicle or bexarotene (500 nM). Mitochondrial membrane potential was determined from the ratio of mitochondrial to cytosolic JC-1 fluorescence. *P < 0.05, ANOVA with post-hoc Tukey test. n = 3 biological replicates; n = 3 technical replicates. Results were normalized to WT mouse neurons at baseline as in (B). (E) We quantified active caspase-3 immunostaining of BAC-HD mouse primary cortical neurons, transfected with the indicated shRNA expression vectors, and treated with vehicle or bexarotene (500 nM) for 24 hours and H2O2 (25 μM) for 4 hours. *P < 0.05, ANOVA with post-hoc Tukey test. n = 3 biological replicates; 30 to 50 cells were counted per experiment. (F) We performed reverse transcription polymerase chain reaction (RT-PCR) analysis of RNA expression of the PPARδ target genes pyruvate dehydrogenase kinase isoform 4 (PDK4), angiopoietin-like 4 (Angptl4), and uncoupling protein 2 (UCP2) in BAC-HD mouse primary cortical neurons, treated as indicated. **P < 0.01, ANOVA with post-hoc Tukey test. n = 6 independent experiments. Error bars represent SEM. Audrey S. Dickey et al., Sci Transl Med 2017;9:eaal2332 Published by AAAS