EMBO/SourceData huggingface dataset:
Figure 4(A) Under limiting SUMO conditions (1/4 SUMO-1, lanes 3-9), PIAS1 increases HTT-SUMO modification above 1/4 SUMO alone. Purified HTT (arrow) and SUMO-HTT (boxed region) were detected using anti-HTT. Graph depicts quantitation of the Ni-NTA western blot using the Odyssey Infrared Imaging Software (LI-COR) to calculate the ratio of HTT purified versus the HTT modified by SUMO multiplied by 100.(B) Western analysis of overexpression of HTTex1 (46QP-H4 or 3R), SUMO-2 (GFP-SUMO-2), and all the PIAS proteins (PIAS1, PIASxα, PIASxβ, PIAS3, and PIASy). Under nonlimiting SUMO-2 conditions, PIAS1 enhances SUMO modification of HTT. WC TCA shows overall myc-actin (transfection control) and HTT levels. Graph quantitating the ratio of HTT purified versus the HTT modified using the Odyssey (LICOR).(C) Left panel is the autoradiography results of a GST pull-down assay showing that radiolabeled human PIAS1 interacts with HTTex1p. Right panel is a phosphorimager analysis of GST pull-downs, performed in triplicate, showing the percentage of 35S-labeled PIAS protein that bound the GST proteins: GST alone, unexpanded HTT with and without the proline-rich region (20QP and 20Q), expanded HTT with and without the proline-rich region (51QP and 51Q), and the proline-rich region alone (Pro). Error bars were calculated as an estimate of SE = STDEV(n)/SQRT(n-1).
Figure 5(B) Longer HTT polypeptides are modified by SUMO-1. Western blot overexpressing HTTex1p (46QP-H4 or 3R), unexpanded HTT-586 fragment (25Q-586 or 25Q-3R-586 aa), and expanded HTT-586 fragment (137Q-586 or 137Q-3R-586 aa) with SUMO-1 (GFP-SUMO-1). Cell lysates were subjected to HTT immunoprecipitation (IP) using HTT antibody. Western analysis performed with the Odyssey (LI-COR) allows detection of HTT (data not shown) and SUMO simultaneously and shows that all forms of HTT are SUMO-1 modified using the anti-GFP antibody. HTTex1p is covalently SUMO-1 modified (lane 3), and the modification disappears when Lys are mutated to Arg (3R) (lane 4). Both unexpanded (lane 4 and 5) and expanded HTT-586 fragments (lane 6 and 7) are covalently SUMO-1 modified in both the presence and absence of the three Lys in the N-terminal region of HTT (3R). Free SUMO-1 is indicated with the arrow, and SUMO-modified HTT is indicated by the boxes. Inset on the right, from a replicate experiment, shows comigration of expanded HTT (anti-HTT) and SUMO-1 (anti-GFP) displayed in the gray scale and in color when the two antibodies are merged (HTT in red, SUMO-1 in green, and yellow when colocalizing).(C) Bait plasmids (HTT-586-25Q or HTT-586-73Q aa) were transformed into the L40ccua MATa yeast strain. Yeast clones encoding bait proteins were individually mated against a matrix of MATα yeast clones encoding 16,888 prey proteins (with Gal4 activation domain fusions) using pipetting and spotting robots. Diploid yeasts were spotted onto SDIV (-Leu-Trp-Ura-His) agar plates for selection of PPIs as well as nylon membranes placed on SDIV agar plates for β-galactosidase assays. After 5-6 days of incubation at 30ºC, digitized images of the agar plates and nylon membranes were assessed for growth and β-galactosidase activity using the software Visual Grid (GPC Biotech).(D) Overexpression of PIAS1 alone, with unexpanded HTT constructs (25Q-586 aa) plus SUMO-1 (GFP-SUMO-1), shows that PIAS1 binds both full-length HTT and HTT-586 fragment (25Q-586 aa). WT HTT was used in these experiments to preclude confounding aggregation effects. Western analysis detection was performed using Odyssey and is displayed in the gray scale but is shown in color on the merge (HTT is red, and PIAS1 is green). WB, western blot.(E) HeLa cells overexpressing either expanded 586 aa-HTT or the phosphomimetic (S13,16D = DD) with SUMO-2 plus and minus PIAS1. HTT was purified by IP using hydrazide beads (Bioclone) crosslinked to HTT (Enzo) antibody and subjected to western analysis using anti-HTT (MAB5490). Arrows indicate SUMO-2-modified HTT.(F) IP of HTT with hydrazide-linked beads shows that both unexpanded and expanded HTT 586 aa phosphomimetics (S13, 16D-586 aa) are modified by SUMO-2. Arrows indicate SUMO-conjugated HTT. Note that all experiments including the Y2H assay were done in triplicate; representative experiments are shown. Arrows indicate SUMO-2-modified HTT.
Figure 6(A) Western analysis of whole-cell lysates from HeLa cells transfected with His-SUMO-1 or SUMO-2 and/or 97Q-HTT exon 1 and treated with 5 μM MG132 for 18 hr. Lysates were separated using differential centrifugation into a detergent-soluble fraction (SOLUBLE) with 1% Triton X-100 and a detergent-insoluble fraction (INSOLUBLE) with 4% SDS. Western blot probed with anti-HTT shows full-length endogenous HTT in the SOLUBLE fraction (upper arrow) and 97Q-HTTex1 (lower arrow) (left panel). In the INSOLUBLE fraction, HTT HMW species are indicated by the bracket and asterisks (right panel).(B) MG132 and SUMO-2 cause mutant HTT to accumulate as HMW species (bracke and asterisk). Western blot showing IP with HTT antibody crosslinked beads from the detergent-insoluble fraction probed with the anti-HTT antibody.(C) Mutant HTT (97Q-Httex1) fibrils are detected with anti-HTT in the insoluble fraction with treatment of MG132 or addition of exogenous SUMO-2.(D) Western blot with increasing concentrations of SUMO-2 detected with anti-His antibody (left panel). Middle panel is the same western blot probed with anti-HTT showing soluble forms of HTT. Right panel presents western blot from detergent-insoluble fraction with monomeric HTT (97Q) at 55 kDa, and the asterisk (*) indicates the HMW species. Note that all experiments were performed in triplicate; representative figures are shown.
Figure 7(A) Western blot analysis of HeLa cells over-expressing exogenous PIAS1 in the presence of mutant HTT (97Q) when separated into detergent-soluble and detergent-insoluble fractions. No difference is detected in monomeric HTT (top panel, Soluble), but HMW HTT levels increase with PIAS1 overexpression. Anti-PIAS1 antibody (Invitrogen) was used to detect PIAS1.(B) Acute knockdown of PIAS1 decreases HMW HTT species in the detergent-insoluble fraction. PIAS1 knockdown is detected in detergent-soluble and -insoluble fractions using anti-PIAS1 antibody.(C) Drosophila melanogaster expressing mutant HTTex1p (93Q) in a reduced Su(var)2-10/dPIAS genetic background exhibits statistically significantly reduced photoreceptor neuron degeneration (left panel, p = 0.033) when comparing dPIAS/+ to +/+ flies and increased overall survival (right panel, p = 0.047) when comparing dPIAS1/+ to +/+ flies. Significance was measured by Student's t test.(D) HMW SUMO-2 accumulates in postmortem HD striata. Western blot analysis of the insoluble fraction from three control and three HD postmortem striata as described (Experimental Procedures).
Figure 1B) Larval brains at 6 h ALH from grh-Gal4; UAS-CD8-GFP were labeled with Sas-4, Dpn, and GFP.C) Larval brains at 0 h ALH from grh-Gal4; UAS-CD8-GFP were labeled with γ-tubulin (γ-tub), Asl, and GFP and imaged under super-resolution microscopy. D) Larval brains at 0 h ALH from grh-Gal4; UAS-CD8-GFP were labeled with Centrosomin (CNN), Asl and GFP and imaged under spinning disc super-resolution microscopy. E) Larval brains at 0 h ALH from Jupiter-GFP (G147) were labeled with GFP, Msps, and Dpn. F) Larval brains at 24 h ALH from Jupiter-GFP were raised on normal food (fed) and food depleted of amino acids (nutritional restriction/NR) and labelled with GFP and Dpn.
Figure 2 A) Larval brains at 16 h ALH, in which kin-lacZ was expressed under the control of insc-Gal4, tub-Gal80ts, were labelled with β-Gal, Msps, and Dpn. The primary protrusion of qNSCs was marked by Msps. Quiescent NSCs at the ventral nerve cord (VNC) are shown. Arrows indicate the localization of Kin-lacZ in qNSCs. B) Larval brains at 6 h ALH from insc-Gal4; UAS-nod-lacZ were labeled with β-Gal, Msps, and Dpn. Quiescent NSCs at both CB and VNC are shown. Arrows indicate the localization of Nod-lacZ in qNSCs
Figure 4 B) Quantification graph of fold changes in the number of EB1-GFP comets in the primary protrusion of qNSCs 6 h ALH from various genotypes compared with the control in (A). n=26 NSCs for control; n=18 NSCs for mspsP18; n=21 NSCs for mspsP18/P. ****p<0.0001. C) Quantification graph of the percentage of retrograde EB1-GFP comets in the primary protrusion of qNSCs from the control, mspsP18 with EB1-GFP driven by grh-Gal4 at 6 h ALH. As EB1-GFP comets were almost lost in mspsP18, we were unable to capture adequate EB1-GFP comets for each individual brain to calculate the standard deviation. 38 and 41 qNSCs were analyzed in control and mspsP18, respectively. In control qNSCs, among total 383 EB1-GFP comets, 353 were anterograde and 30 were retrograde movements. In mspsP18 qNSCs, we only found 12 EB1-GFP comets with 6 anterograde and 6 retrograde movements  D) Larval brains at 24 h ALH from control (grh-Gal4 UAS-CD8-GFP + UAS-nod-lacZ) and msps810,UAS-nod-lacZ under the control of grh-Gal4 UAS-CD8-GFP were labeled with β-Gal, Dpn, and GFP. Quiescent NSCs in the central brain were shown. Arrows point at the localization of Nod-lacZ in qNSCs. E) Quantification graph of Nod-β-Gal localization in qNSCs from genotypes in (D). n=55 NSCs for control; n=45 NSCs for msps810. ****p<0.0001  F) Larval brains at 16 h ALH from control (grh-Gal4 UAS-CD8-GFP; UAS-dicer2 + UAS -nod-lacZ) and msps RNAi, UAS-nod-lacZ (VDRC#21982) with grh-Gal4 UAS-CD8-GFP; UAS-dicer2 were labeled with β-Gal, Dpn, and GFP. Quiescent NSCs in the central brain are shown. Arrows indicate the localization of Nod-lacZ in qNSCs. G) Quantification graph of Nod-β-Gal localization in qNSCs from genotypes in (F). n=60 NSCs for control; n=68 NSCs for msps RNAi. ****p<0.0001  H) Larval brains at 24 h ALH from wild-type control (grh-Gal4>UAS-CD8-GFP), msps924, and mspsP18 expressing grh>CD8-GFP were labeled with Dpn and GFP. The arrow indicates the second protrusion in msps924. I) Quantification graph of the thickness of the primary protrusion of qNSCs from wild-type, msps924, and mspsP18 expressing grh>CD8-GFP. The thickness was measured at the middle point of the primary protrusion. n=18 NSCs for control; n=52 NSCs for msps924; n=32 NSCs for mspsP18. **** p<0.0001  L) Larval brains at 24 h ALH from control (grh-Gal4 UAS-CD8 -GFP + UAS-nod-lacZ) and tacc74,UAS-nod-lacZ under the control of grh-Gal4 UAS-CD8-GFP; tacc59 were labeled with β-Gal, Dpn, and GFP. Quiescent NSCs in the central brain are shown. M) Quantification graph of Nod-β-Gal localization in qNSCs from genotypes in (L). n=51 NSCs for control; n=65 NSCs for tacc59/74. **p=0.0051
Figure 5A) Larval VNCs at 24 h ALH from the control (grh-Gal4 UAS-CD8-GFP) and msps810 with grh-Gal4 UAS-CD8-GFP were labeled with E-cadherin, Dpn, and GFP. NSC-neuropil contact were marked by dashed lines, and NSC-neuropil contact points were circled. B) Quantification of E-cadherin basal localization at NSC-neuropil contact sites in qNSCs from genotypes in (A). "No E-cad" means absent or strongly reduced E-cad observed at the basal region of qNSCs. n=32 NSCs for control; n=61 NSCs for msps810. **p=0.0028. C) Quantification graph of the basal E-cad intensity at NSC-neuropil contact sites by normalizing against Dpn intensity in qNSCs from genotypes in (A). n=34 NSCs for control; n=40 NSCs for msps810. ****p<0.0001. D) Larval VNCs at 24 h ALH from control (grh-Gal4 UAS-CD8-GFP) and msps924 with grh-Gal4 UAS-CD8-GFP were labeled with E-cadherin, Dpn, and GFP. NSC-neuropil contact were marked by dashed lines, and NSC-neuropil contact sites were circled. E) Quantification of E-cadherin basal localization at NSC-neuropil contact sites in qNSCs from genotypes in (D). "No E-cad" means absent or strongly reduced E-cad observed at the basal region of qNSCs. n=77 NSCs for control; n=30 NSCs for msps924. **p=0.0080. F) Quantification graph of the basal E-cad intensity at NSC-neuropil contact sites by normalizing against Dpn intensity in qNSCs from genotypes in (D). n=60 NSCs for control; n=37 NSCs for msps924. ****p<0.0001. H) Larval brains at 16 h ALH from control t-GRASP under the control of single driver grh-Gal4 or nSyb-QF2 (Q-system) and t-GRASP under the control of driver pairs grh-Gal4 and nSyb-QF2 (Q-system) were analyzed for E-Cad, GFP (reconstituted GFP), and Dpn. Arrows pointing at the cell body of qNSCs on the two different focal planes. NSC-neuropil contact sites were circled by dashed lines.
Figure 6 A) Larval brains at 16 h ALH from wild-type (yw) and E-cadR69 were analyzed for EdU incorporation, and larval brains were labeled with EdU, Dpn and Mira  E) Larval brains at 24 h ALH from the wild-type control (yw) and klp64Dk5h/Df, kap3V6 and kap3 V6; g-kap3#11 were stained with EdU, Dpn, and Mira I) Larval brains at 24h ALH from wild-type control (yw), klp64Dk5/Df, and kap3V5 were analyzed E-cad at the NSC-neuropil contact sites, and NSCs were labeled with Dpn and Msps
Figure 7A) Larval brains at 24 h ALH from wild-type control (UAS-β-Gal RNAi; UAS-β-Gal RNAi), msps RNAi control (UAS-GFP + UAS-msps RNAi (21982)), and rescued animals (UAS-klp64D+ msps RNAi (21982)) under the control of insc-Gal4 were analyzed for EdU incorporation, and larval brains were labeled with EdU and Dpn. B) Quantification graph of EdU-negative NSCs per brain lobe for genotypes in (A). n=13 BL for contorl; n=13 BL for msps RNAi; n=20 BL for UAS-klp64D + msps RNAi. ****p<0.0001.D) Larval brains at 24 h ALH from wild-type control (UAS-β-Gal RNAi), RNAi control (UAS-msps RNAi (21982)), and rescued animals (g-kap3 + msps RNAi (21982)) driven by insc-Gal4 were examined for EdU incorporation, and larval brains were stained with EdU and Dpn. E) Quantification graph of NSCs negative for EdU incorporation per brain lobe for genotypes in (D). n=13 BL for control; n=15 BL for msps RNAi; n=19 BL for g-kap3 + msps RNAi. ****p<0.0001. G) 24 h ALH Larval brains from wild-type control (UAS-β-Gal RNAi; UAS-β-Gal RNAi), RNAi control (UAS-GFP + UAS-msps RNAi (21982)), and rescued animals (UAS-E-cad7 + msps RNAi (21982)) were assessed for EdU incorporation, and larval brains were stained with EdU and Dpn. H) Quantification graph of NSCs negative for EdU incorporation per brain lobe for genotypes in (G). n=21 BL for control; n=21 BL for msps RNAi; n=22 BL for UAS-E-cad7 + msps RNAi. ****p<0.0001. J) 24 h ALH Larval brains from wild-type control (UAS-β-Gal RNAi), mutant control (UAS-β-Gal RNAi + klp64Dk5h), and rescued animals (UAS-E-cad7 + klp64Dk5h) were processed for EdU incorporation, and larval brains were probed by with EdU, Dpn, and Mira. K) Quantification graph of NSCs negative for EdU incorporation per brain lobe for genotypes in (J). n=10 BL for control; n=12 BL for klp64Dk5h; n=10 BL for UAS-E-cad7 + klp64Dk5h. ****p<0.0001; p=0.3006 (ns).
Figure 1LL-37(4 kD) detection by Western blotting. Prior to loading, samples were centrifuged through 10 kD ultrafiltration membranes and the equal amount of ultrafiltrate (19μg/lane) subject to immunoblotting. High-molecular-weight proteins (GAPDH) were not detected in ultrafiltrate.The CFU of PAO1 was measured by culturing in ultrafiltrate (upper panel) or retentate (lower panel) of mouse BALF samples from indicated mice. Initial additions of PAO1 were 1 × 103 CFU. Coculture duration, 6h. n=3.The bacterial CFU (per gram) in lungs of indicated mice with and without PAO1 infection (5 × 106 CFU) for 6, 24 and 48 hours. n=3. Error bars, S.E.M.Representative histological sections of indicated lungs with PAO1 infection (5 × 106 CFU) for 6 hours. H&E staining. Scale bar, 1000 μm (upper panel) and 50 μm (lower panel).Histopathological injury score of indicated mouse lungs with PAO1 infection (5 × 106 CFU) for 6 h and 24 h based on blinded expert judgement. n=3. Error bars, S.E.M.Gene expression level of IL-1β and IL-6 of indicated mouse lung with PAO1 infection (5 × 106 CFU) for 6 h and 24 h. n≥3. Error bars, S.E.M. *, P<0.05; **, P<0.01; ***, P<0.001; ****, P<0.0001.
Figure 2Heatmap showing transcriptome profile correlation values of indicated lung tissue samples before and after PAO1 infection.Histogram of selected differentially expressed genes of LL-37+/+ mouse lung versus wild type FVB mouse lung prior to infection. Blue bars indicated genes up-regulated in wild type FVB mouse lungs, red bars indicated genes up-regulated in LL-37+/+ mouse lungs.
Figure 3Detection of LL-37 expression in the engineered mDASCs by immunofluorescenceDetection of LL-37 expression in the engineered mDASCs by real-time quantitative PCRDetection of LL-37 expression in the engineered mDASCs by Western blotAnti-Krt5 (red) and anti-P63 (green) immunostaining of WT- and LL-37-mDASC colonies. Scale bar, 70 μm.Stem cell colony-forming efficiency of WT- and LL-37-mDASCs during 5 serial passages. n=6.Representative 3D organoid culture of mDASCs with expression of type I alveolar cell markers (Aqp5 and Pdpn). Left panels, bright field imaging of 3D organoids. Right panels, immunofluorescence of organoid sections. Scale bar, 20 μm.Co-culture of bacteria with DASC shows the antimicrobial effects in dose-dependent manner. Initial additions of PAO1 were 0.1×, 0.5× and 1 × 104 CFU, respectively. Coculture duration, 6h. n=4. Error bars, S.E.M. MOI, Multiplicity of infection.Co-culture of bacteria with DASC shows antimicrobial effects in time-dependent manner. Initial additions of PAO1 was 1 × 104 CFU. MOI=1. n=3. Error bars, S.E.M.Preincubation of cells with anti-LL-37 antibody, but not IgG control, significantly reduced anti-PAO1 and anti-E.coli (J) effects of LL-37-mDASCs. Initial dose of bacteria was 103 CFU.
Figure 4Bright field and direct fluorescence images of mouse lungs following transplantation of 1 × 106 GFP-labeled WT-mDASCs (WT-Lung) or LL-37-mDASCs (LL-37-Lung) on indicated days. Scale bar, 1000 μmEngraftment ratio of transplanted cells in mouse lungs on indicated days. n=3. Error bars, S.E.M. *P=0.0474.Morphology of engrafted GFP-labeled cells in lung parenchyma by direct fluorescence. Blue color indicates nucleus DAPI staining. Scale bar, 200 μm.Anti-Ki67 immunofluorescence of engrafted GFP-labeled WT- and LL-37-mDASCs in lung parenchyma 21 days after transplantation. Scale bar, 50 μm.
Figure 5Distribution of engrafted GFP-labeled cells in lung parenchyma by immunofluorescence 7 days after transplantation. WT-Lung: WT-mDASCs engrafted; LL-37-Lung: LL-37-mDASCs engrafted. Scale bar, 200 μm. Arrows showed the representative cells with overlapping fluorescence of GFP and LL-37.Intratracheal instillation of equal amount of PAO1(5 ×106 CFU per mouse) into WT-Lung (WT-mDASCs engrafted) and LL-37-Lung (LL-37-mDASCs engrafted) followed by bacterial CFU analysis in whole lung homogenates 6, 24 and 48 hours after infection. n=3. Error bars, S.E.M. Intratracheal instillation of equal amount of PAO1 into WT-Lung and LL-37-Lung followed by bacterial CFU analysis in BAL fluid 6, 24 and 48 hours after infection. n=3. Error bars, S.E.M.Arterial blood gas analysis of mice with WT-Lung and LL-37-Lung following PAO1 infection. n=6. Error bars, S.E.M. *, P<0.05; **, P<0.01; ***, P<0.001; ****, P<0.0001.
Figure 6H&E staining showing histology of injured lung infected by PAO1 with WT-mDASCs or LL-37-mDASCs transplantation. Scale bar, 100 μm. Histopathological examination according to the lung injury scoring system based on blinded expert judgement. n=5 mice per group. Error bars, S.E.M.CD68 immunochemistry (brown) in infected lung with WT-mDASCs or LL-37-mDASCs transplantation. Scale bar, 50 μm. Quantification of brown-stained (CD68+) area by Image J software. n=5. Error bars, S.E.M.Gene expression level of indicated pro-inflammatory cytokines of lung infected by PAO1 with WT-mDASCs or LL-37-mDASCs transplantation. n=3. Error bars, S.E.M. *, P<0.05; **, P<0.01; ***, P<0.001; ****, P<0.0001.
Figure 7Anti-Krt5 (red) and anti-P63 (green) immunofluorescence of isolated hDASCs. Scale bar, 90 μm.The mRNA expression levels of LL-37 was measured by qPCR for WT- and LL-37-hDASCs. n=5. Error bars, S.E.M.H&E staining of native rat lung tissue and decellularized scaffold showed the absence of nuclei following decellularization. Scale bar, 40 μm.Ex vivo biomimetic culture of LL-37-hDASCs recellularized lungs with constant media perfusion.Direct fluorescence image showing GFP-labeled LL-37-hDASCs before (left) and 7 days after (right) being engrafted onto the decellularized scaffold. Scale bar, 100 μm (right panel) and 1000 μm (right panel)Immunofluorescence of recellularized lung with indicated antibodies. Blue color indicates nucleus DAPI staining. Scale bar, 50 μm.The recellularized lung by LL-37-hDASCs displayed growth inhibitory effect on PAO1 and E.coli. Initial dose of bacteria was 2× 104 CFU. Culture duration, 24h. n=6. Error bars, S.E.M. *, P<0.05; **, P<0.01; ***, P<0.001; ****, P<0.0001.
Figure 1(A, B) Representative images (A) and quantification (B) of calcium-stable k-fiber intensity levels by immunofluorescence analysis of n≥41 tubulin-stained mitotic cells of neonatal (N) and elderly (87y) human dermal fibroblasts (HDF) at prometaphase and metaphase stages. Intensity levels were normalized to neonatal samples. Scale bar, 5µm. Data information: All values shown are mean ± s.d. of at least two independent experiments. ns p>0.05, * p<0.05, ** p<0.01, **** p<0.0001 by two tailed Mann-Whitney test(C) Intra-kinetochore distance (between Hec1 and ACA immunostainings of a kinetochore) in n=50 kinetochore pairs scored from 10 elderly vs. neonatal cells in prometaphase and metaphase. (D) Inter-kinetochore distance (between Hec1 staining of sister kinetochores) in n=50 kinetochore pairs scored from 10 elderly vs. neonatal cells in prometaphase and metaphase. Data information: All values shown are mean ± s.d. of at least two independent experiments. ns p>0.05, * p<0.05, ** p<0.01, **** p<0.0001 by two tailed Mann-Whitney test(E, Live cell imaging of neonatal (N) and elderly (87y) fibroblasts expressing H2B-GFP/α-Tubulin-mCherry treated with kinesin-5 inhibitor (STLC) to induce monopolar spindles, followed by washout (WO) into medium with DMSO (-) or ZM447439 (+; 500nM). (E) Quantification of anaphases with lagging chromosomes in n=cells scoredF) Live cell imaging of neonatal (N) and elderly (87y) fibroblasts expressing H2B-GFP/α-Tubulin-mCherry treated with kinesin-5 inhibitor (STLC) to induce monopolar spindles, followed by washout (WO) into medium with DMSO (-) or ZM447439 (+; 500nM). (F) representative movie frame series of a young and an elderly dividing cell that underwent correct (Normal) and incorrect (Lagging) chromosome segregation, respectively. Time, min:sec. Scale bars: 5µm (images) or 2µm (insets).(G) Representative images of anaphases without (top) and with (bottom) mis-segregation (MS), FISH-stained for three chromosome pairs (7, 12 and 18). Arrowheads indicate micronuclei containing centromeric signal for chromosome 18. Scale bar, 10µm. (H) Percentage of anaphases with MS in neonatal (N) vs. elderly (87y) n=cells scored by FISH analysis. Data information: All values shown are mean ± s.d. of at least two independent experiments. ns p>0.05, * p<0.05, ** p<0.01, **** p<0.0001 by (H) chi-square test.(I) Western blot analysis of total MCAK protein levels in neonatal (HDF N) and elderly (HDF 87y) fibroblasts. GAPDH is shown as loading control.(J) Immunofluorescence analysis of MCAK levels in neonatal (HDF N) and elderly (HDF 87y) mitotic cells. Scale bar, 5µm.