Since glutamate receptor activation and neuronal firing both induce calcium influx, we determined their relative contributions to the increased Gcamp6 activation by. using the ion channel inhibitors TTX and TEA to block neuronal firing. C9ORF72+/− iMNs still displayed more frequent Gcamp6 activation than C9ORF72+/+ iMNs (Supplementary Fig. 13a), indicating that part of the hyperexcitability is due to increased glutamate receptor activation. To determine which receptors were responsible for the increased glutamate response, we tested small molecule agonists of specific glutamate receptor subtypes. Activation of NMDA, AMPA, and kainate receptors was higher in C9ORF72+/− iMNs than controls (Supplementary Fig. 13a).
HEK 293T cells were used to produce retrovirus, lentivirus, and C9ORF72 protein. HEK cells were used for these purposes based on previous published studies using HEK cells in order to produce viral particles and mammalian proteins. HEK cells were obtained from American Type Culture Collection, catalog number CRL-11268. HEK and iPS cells were tested for mycoplasma before, during, and after the study and were negative.
Base text for this translation. ___. Wang Meng’ou’s , ed. Tangren xiaoshuo jiaoshi . Taipei: Zhongzheng Shuju, 1983, 2319-38. For other texts and editions see footnote 1. Translations Birch, Cyril. “The Curly-bearded Hero,” in Anthology of Chinese Literature, v. 1, New York, 1965, pp. 314-322. Chai, Ch’u, and Winberg Chai. “The Curly-Bearded Guest,” in A Treasury of Chinese Literature, New York, 1965, pp. 117-124. Hsu Sung-nien. “Biographie d’un preux barbu,” Anthologie de la littérature chinoise.Paris: Delagrave, 1933, pp. 241-6. Levenson, Christopher, tran., The Golden Casket. Harmondsworth, Middlesex: Penguin Books, 1967, pp. 137-47. Lévy, André. “Barbe-bouclée, L’étranger à la barbe et aux favoris bouclés,” in Histoires extraordinaires et récits fantastiques de la Chine ancienne.Paris: Flammarion, 1993, pp. 177-195 (with notes). Lin Yutang. “Curly-Beard,” in Famous Chinese Short Stories. New York: John Day (Cardinal), 1953, pp. 3-22. Schafer, E.H. “Three Divine Women of South China,” CLEAR, 1 (1979), pp. 31-42. Wang, Elizabeth Te-chen, tran. “The Curly-Bearded Guest,” in Wang’s Ladies of the Tang: 22 Classical Chinese Stories. Taipei: Mei Ya Publications, 1973, pp. 133-50.
For experiments other than the comparison of Apilimod and the reduced-activity analog, Apilimod was purchased from Axon Medchem (cat. no. 1369). For the reduced-activity analog assays, Apilimod and the reduced activity analog were synthesized at Icagen, Inc. according to the schemes shown in Supplementary Fig. 16. PIKFYVE kinase inhibition was measured using the ADP-Glo kinase assay from SignalChem according to the manufacturer’s instructions, using purified PIKFYVE kinase (SignalChem cat. no. P17–11BG-05).
Hb9::RFP+ C9ORF72 ALS/FTD iMNs were generated in 96-well plates. On Day 15 post transduction, neurotrophic factors and RepSox were withdrawn and the small molecule library was added (EMD Millipore kinase collection and Stemselect library, 3.3 µM final concentration) and added fresh every other day until the screen was terminated on Day 25 post-transduction. Identification of neuroprotective compounds was identified using SVcell 3.0 (DRVision Technologies) and further verification by manual iMN tracking.
Mice were anesthetized with i.p. ketamine (100 mg ⁄ kg) and xylazine (10 mg ⁄ kg), and body temperature kept at 36.9 ± 0.1°C with a thermostatic heating pad. Mice were placed in a stereotactic apparatus (ASI Instruments, USA) and the head is fixed accordingly. A burr hole was drilled, and an injection needle (33 gauge) was lowered into the hippocampus between CA1 and the dentate gyrus (AP −2.0, ML +1.5, DV −1.8). NMDA (20 nmol in 0.3 μl of phosphate-buffered saline, pH 7.4) was infused over 2 min using a micro-injection system (World Precision Instruments, Sarasota, FL, USA). Simultaneously, or independently, Apilimod (0.3 μl of 20 μM in phosphate-buffered saline, pH 7.4) was infused over 2 min using a micro-injection system (World Precision Instruments, Sarasota, FL, USA). The needle was left in place for an additional 8 min after the injection. Animals were euthanized 48 h later. Brains were quickly removed, frozen on dry ice, and stored at −80°C until processing. Thirty-micrometer-thick coronal sections were prepared using a cryostat. Every fifth section 1 mm anterior and posterior to the site of injection was stained with cresyl violet. The lesion area was identiﬁed by the loss of staining, measured by NIH ImageJ software and integrated to obtain the volume of injury.
All experiments involving live vertebrates (cortical glial isolation) performed at USC were done in compliance with ethical regulations approved by the USC IACUC committee. All animal use and care at the University Medical Center Utrecht were in accordance with local institution guidelines of the University Medical Center Utrecht (Utrecht, the Netherlands) and approved by the Dierexperimenten Ethische Commissie Utrecht with the protocol number DEC 2013.I.09.069.
To generate Dox-NIL iMNs, the Dox-NIL construct was integrated into the AAVS1 safe harbor locus of the control, C9+/−, and C9-ALS patient iPSC lines using CRISPR/Cas9 editing (gRNA sequence shown in Supplementary Table 4). Dox-NIL iMNs were generated by plating at ~25% confluency on matrigel coated plates and adding 1 μg/ml of doxycylin in N3 media +7.5 μM RepSox 1 day after plating. Mouse primary mixed glia were added to the cultures at day 6, and doxycyline was maintained throughout conversion. iMN cultures were harvested at day 17.
The fabrication of composite cathode with boroxine ring for all-solid-polymer lithium cell was described. Composite polymer electrolyte (CPE) was applied between the lithium metal anode and the composite cathode in a coin-shaped cell in order to prepare the solid-polymer electrolyte cell. The CPE films were cast on a flat polytetrafluoroethylene vessel from an acetonitrile slurry containing BaTiO ... [Show full abstract]Read more
(a) Production of Hb9::RFP+ iMNs and survival tracking by time-lapse microscopy. (b-d) Survival of control (CTRL) and C9ORF72 patient (C9-ALS) iMNs with neurotrophic factors (b) or in excess glutamate (shown with iMNs from all lines in aggregate (b, c) or for each individual line separately (d)). For (b-d), n=50 iMNs per line for 2 control and 3 C9-ALS lines, iMNs quantified from 3 biologically independent iMN conversions per line. (e) iMNs at day 22 in excess glutamate. This experiment was repeated three times with similar results. (f-g) Survival of control and C9-ALS iMNs in excess glutamate with glutamate receptor antagonists (f) or without neurotrophic factors (g). For (f-g), n=50 iMNs per line for 2 control and 3 C9-ALS lines, iMNs quantified from 3 biologically independent iMN conversions per line. (h) Survival of induced dopaminergic (iDA) neurons in excess glutamate. n=50 iMNs per line for 2 control and 2 C9-ALS lines, iMNs quantified from 3 biologically independent iMN conversions per line. Except in (d), each trace includes neurons from at least 2 donors with the specified genotype; see full detail in Methods. Scale bar: 100 μm (e). All iMN survival experiments were analyzed by two-sided log-rank test, and statistical significance was calculated using the entire survival time course. iMN survival experiments in (b-g) were performed in a Nikon Biostation and experiments in (h) were performed in a Molecular Devices ImageExpress.
We show for the first time that chemical or genetic modulators of vesicle trafficking can fully rescue iMN degeneration caused by the C9ORF72 repeat expansion. Previous studies have implicated several rare ALS or FTD mutations linked to these vesicle trafficking pathways, but by showing that C9ORF72 is haploinsufficient in ALS/FTD and demonstrating that perturbation of vesicle trafficking rescues C9ORF72 neurodegeneration, our findings highlight mechanistic convergence in a large portion of ALS.
To determine if the survival difference between C9ORF72 patient iMNs and controls was specific to our transcription factor-based reprogramming approach, we also measured the survival of Hb9::RFP+ control and C9ORF72 patient motor neurons derived from iPSCs by small molecule activation of the Sonic Hedgehog and retinoic acid signaling pathways 28 (Supplementary Fig. 3g, h). Similarly to iMNs, morphogen-generated motor neurons showed a significant survival difference between C9ORF72 patients and controls (Supplementary Fig. 3i-l).
Because C9ORF72 activity is required to maintain normal lysosomal function, we measured the effect of C9ORF72 activity on PR50 clearance by monitoring the clearance of PR50-Dendra2 fusion proteins in C9ORF72−/− iPSC-derived fibroblasts with or without exogenous C9ORF72. Dendra2 is a green fluorescent protein that irreversibly converts to red fluorescence when exposed to blue light, enabling quantification of its degradation 49. PR50-Dendra2 formed discrete punctae within cells, indicating that Dendra2 did not prevent intracellular aggregation of PR50 (Supplementary Fig. 14c). Expression of C9ORF72-T2A-GFP in C9ORF72−/− iPSC-derived fibroblasts significantly enhanced the decay of PR50-Dendra2 fluorescence over GFP alone (Supplementary Fig. 14d). To determine if C9ORF72 activity modulates DPR aggregate clearance in human motor neurons, we compared the decay of PR50-Dendra2 in C9ORF72+/+ and C9ORF72+/− iMNs (Fig. 5e and Suppementary Fig. 14e). Consistent with the hypothesis that C9ORF72 activity promotes DPR aggregate clearance, PR50-Dendra2 decayed significantly slower in C9ORF72+/− iMNs (Fig. 5e).
Amongst four reproducible hit compounds, we identified a PIKFYVE kinase inhibitor (YM201636) that significantly increased C9ORF72 patient iMN survival (n=2 patients) (Fig. 6b, c and Supplementary Fig. 15a). PIKFYVE is a lipid kinase that converts phosphatidylinositol 3-phosphate (PI3P) into phosphtidylinositol (3,5)-bisphosphate (PI(3,5)P2)51(Fig. 6f). PI3P is primarily generated by PI3-kinases recruited to early endosomes by RAB5, and PI3P anchors EEA1 to early endosomes to drive endosomal maturation 52(Fig 6f). Following endosomal maturation into lysosomes, PI3P drives fusion of lysosomes with autophagosomes 53. PIKFYVE regulates PI3P levels by converting PI3P into PI(3,5)P2 52, which disfavors lysosomal fusion with endosomes and autophagosomes 53,54. Therefore, inhibition of PIKFYVEincreases autophagosome-lysosome fusion 53 and may compensate for reduced C9ORF72 activity and other disease processes by increasing PI3P levels to facilitate removal of glutamate receptors or DPRs (Fig. 6f). Interestingly, FIG4 is a phosphatase that opposes PIKFYVE kinase by converting PI(3,5)P2 to PI3P and loss-of-function mutations in FIG4 cause ALS 55. Thus, genetic evidence suggests that PIKFYVE inhibition may be capable of modulating ALS disease processes in humans.
Live imaging of iMNs expressing a M6PR-GFP fusion protein that localizes to M6PR+ vesicles 44 confirmed that C9ORF72 patient and C9ORF72-deficient iMNs possess increased numbers of M6PR+ vesicle clusters, and that overexpression of C9ORF72 isoform A or B rescues this phenotype (Supplementary Fig. 9c-g and Supplementary Videos 5-9). Clusters did not disperse over the time course of the assay, suggesting that they are relatively stable and not in rapid flux (Supplementary Videos 5-9). In addition, M6PR+ puncta moved with a slower average speed in C9ORF72 patient and C9ORF72+/− iMNs than controls (Supplementary Fig. 9h, i). Thus, reduced C9ORF72 levels lead to fewer lysosomes in motor neurons in vitro and in vivo, and this may be due in part to altered trafficking of M6PR+ vesicles.
A 241-bp digoxigenin (DIG)-labeled probe was generated from 100 ng control genomic DNA (gDNA) by PCR reaction using Q5® High-Fidelity DNA Polymerase (NEB) with primers shown in Supplementary Data Table 4. Genomic DNA was harvested from control and patient iPSCs using cell lysis buffer (100 mM Tris-HCl pH 8.0, 50 mM EDTA, 1% w/v sodium dodecyl sulfate (SDS)) at 55ºC overnight and performing phenol:chloroform extraction. A total of 25 µg of gDNA was digested with XbaI at 37 ºC overnight, run on a 0.8% agarose gel, then transferred to a positive charged nylon membrane (Roche) using suction by vacuum and UV-crosslinked at 120 mJ. The membrane was pre-hybridized in 25 ml DIG EasyHyb solution (Roche) for 3 h at 47 ºC then hybridized at 47 ºC overnight in a shaking incubator, followed by two 5-min washes each in 2X Standard Sodium Citrate (SSC) and in 0.1% SDS at room temperature, and two 15-min washes in 0.1x SSC and in 0.1% SDS at 68 ºC. Detection of the hybridized probe DNA was carried out as described in DIG System User’s Guide. CDP-Star® Chemilumnescent Substrate (Sigma-Aldrich) was used for detection and the signal was developed on X-ray film (Genesee Scientific) after 20 to 40 min.
IPSC-MNs at differentiation D35 were harvested in cold Hypotonic buffer (20 mM HEPES pH 7.4, 10 mM KCl, 2 mM MgCl2, 1 mM EDTA, 1mM EGTA, 1 mM DTT and protease inhibitor cocktail (Roche)) and lysed by passing through G25 needles 25 times and then spun down at 700 x g for 10min at 4℃. The Supernatant was loaded onto pre-made 30% Percoll solution and re-centrifuged at 33,000 RPM using Beckman rotor SWI55 for 50min at 4℃. 300 ul aliquots were taken from top to bottom as fractions and all the collected samples were boiled with SDS-PAGE sample buffer and analyzed by western blot.
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