EMBO/SourceData huggingface dataset:
Figure 2(A) GFP protein levels in FACS-sorted neonatal (N) and elderly (87y) fibroblasts transduced with empty (control, -), GFP-MCAK (+) and GFP-Kif2b (+) lentiviral plasmids. Tubulin is shown as loading control.(B) Mitotic duration scored by time-lapse phase-contrast microscopy of n≥50 cells per condition measured from nuclear envelope breakdown (NEB) to anaphase onset. Data Information: All values 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 (B Mann-Whitney test.(C, D) Representative images (C) and quantification (D) of calcium-stable k-fiber intensity levels by immunofluorescence analysis of n≥26 tubulin-stained metaphase cells transduced as indicated. Levels were normalized to the control neonatal sample. Scale bar, 5μm. Data Information: All values 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 D) Mann-Whitney test.(E) Representative images of cytochalasin D-induced binucleated (BN) cells without (top) and with (bottom) mis-segregation (MS), FISH-stained for three chromosome pairs (7, 12 and 18). Scale bar, 10µm. (F) Percentage of BN cells with MS in n=cells scored. (G) Percentage of micronuclei in n=cells analyzed. Data Information: All values are mean ± s.d. of at least two independent experiments. ns p>0.05, * p<0.05, ** p<0.01, **** p<0.0001 by (F,G) chi-square test.
Figure 3(A) Representative images of elderly cells scored as negative (-) or positive (+) for Cdkn1a/p21 (cell cycle inhibitor) and 53BP1 (≥1 foci; DNA damage) senescence biomarkers. Scale bar 20µm. (B) Percentage of n=cells staining double-positive for Cdkn1a/p21 and 53BP1 in neonatal (N/N) and elderly (75/87y) human dermal fibroblasts (HDF) transduced with empty, GFP-MCAK or GFP-Kif2b lentiviral plasmids. (C) Representative images of elderly cells scored as negative (-) or positive (+) for SA-β-galactosidase (SA-β-gal) activity. Scale bar 20µm. (D) Percentage of n=cells positive for SA-β-gal in neonatal and elderly HDFs transduced with empty, GFP-MCAK or GFP-Kif2b lentiviral plasmids. Data Information: Values are mean ± s.d. of at least two independent experiments. ns p>0.05, *** p<0.001, **** p<0.0001 by two tailed chi-square test (B,D).(F) Total number of genes altered (up or downregulated, as indicated) for the comparisons shown between control and kinesin-13-overexpressing young (HDF N) and/or aged (HDF 87y) cells.(G, H) Heatmaps of differentially expressed (G) SASP and senescence genes, and (H) cGAS/STING/NF-κB-related genes of neonatal and 87y HDFs. Down and Up refer to the expected changes as reported for senescent cells Gene symbols highlighted in grey indicate genes that were not modulated by overexpression of Kinesin-13 proteins. Z-score row color intensities indicate higher (red) to lower (blue) expression.
Figure 4(A) Mitotic duration of neonatal (N) and elderly (87y) human dermal fibroblasts (HDF) treated for 24 hrs with different concentrations of UMK57 (MCAK agonist). n≥58 cells were analyzed per condition. For all subsequent experiments UMK57 was used at 1µM for 24 hrs. Data Information: All values are mean ± s.d. of at least two independent experiments. ns p>0.05, * p<0.05, ** p<0.01, *** p<0.001, **** p<0.0001 by two tailed (A Mann-Whitney tests.(B, Representative images (B) of calcium-stable k-fiber intensity levels in metaphase, scored by immunofluorescence analysis of n≥34 tubulin-stained mitotic cells of neonatal and elderly samples treated with DMSO (-) and UMK57 (+). Levels were normalized to neonatal DMSO-treated condition. Scale bar, 5µm.C) quantification (C) of calcium-stable k-fiber intensity levels in metaphase, of neonatal and elderly samples treated with DMSO (-) and UMK57 (+). Levels were normalized to neonatal DMSO-treated condition. Scale bar, 5µm. Data Information: All values are mean ± s.d. of at least two independent experiments. ns p>0.05, * p<0.05, ** p<0.01, *** p<0.001, **** p<0.0001 by two tailed C) Mann-Whitney tests.(D) Aneusomy index of chromosomes 7, 12 and 18 measured by interphase FISH analysis of n=cells. Data Information: All values are mean ± s.d. of at least two independent experiments. ns p>0.05, * p<0.05, ** p<0.01, *** p<0.001, **** p<0.0001 by two tailed chi-square tests.(E) Percentage of cytochalasin D-induced binucleated (BN) n=cells with chromosomes 7, 12, and 18 mis-segregation (MS). Data Information: All values are mean ± s.d. of at least two independent experiments. ns p>0.05, * p<0.05, ** p<0.01, *** p<0.001, **** p<0.0001 by two tailed chi-square tests.(F) Percentage of micronuclei in n=cells scored when treated with DMSO or UMK57. Data Information: All values are mean ± s.d. of at least two independent experiments. ns p>0.05, * p<0.05, ** p<0.01, *** p<0.001, **** p<0.0001 by two tailed chi-square tests.(G) Percentage of n=cells staining positive for double immunostaining of Cdkn1a/p21 (cell cycle inhibitor) and 53BP1 (≥1 foci; DNA damage) senescence biomarkers. (H) Percentage of n=cells staining positive for SA-β-galactosidase (SA-β-gal) activity. Data Information: All values are mean ± s.d. of at least two independent experiments. ns p>0.05, * p<0.05, ** p<0.01, *** p<0.001, **** p<0.0001 by two tailed chi-square tests.
Figure 5(A) Mitotic duration of n=100 neonatal (N) and elderly (87y) human dermal fibroblasts (HDF) treated with DMSO (-) or UMK57 (+) for 96 hrs. Data Information: All values are mean ± s.d. of at least two independent experiments. ns p>0.05, * p<0.05, *** p<0.001, **** p<0.0001 by two tailed (A Mann-Whitney tests.(B) Relative calcium-stable k-fiber intensity levels scored by immunofluorescence analysis of n≥29 tubulin-stained metaphase cells of neonatal and elderly samples treated with DMSO and UMK57 for 96 hrs. Levels were normalized to neonatal DMSO-treated condition. Data Information: All values are mean ± s.d. of at least two independent experiments. ns p>0.05, * p<0.05, *** p<0.001, **** p<0.0001 by two tailed B, Mann-Whitney tests.(C) Aneusomy index of chromosomes 7, 12 and 18 measured by interphase FISH analysis of neonatal and elderly n=cells treated for 96 hrs. Data Information: All values are mean ± s.d. of at least two independent experiments. ns p>0.05, * p<0.05, *** p<0.001, **** p<0.0001 by two tailed chi-square tests.(D) Cytochalasin D-induced binucleated (BN) n=cells with mis-segregation (MS) of chromosomes 7, 12 and 18 in neonatal and elderly samples treated for 96 hrs. Data Information: All values are mean ± s.d. of at least two independent experiments. ns p>0.05, * p<0.05, *** p<0.001, **** p<0.0001 by two tailed chi-square tests.(E) Percentage of n=cells staining positive for double immunostaining of Cdkn1a/p21 (cell cycle inhibitor) and 53BP1 (≥1 foci; DNA damage) senescence biomarkers after 96hrs of treatment. (F) Percentage of n=cells staining positive for SA-β-gal activity when treated for 96 hrs with DMSO or UMK57. Data Information: All values are mean ± s.d. of at least two independent experiments. ns p>0.05, * p<0.05, *** p<0.001, **** p<0.0001 by two tailed chi-square tests.(G, Representative images of phospho-Aurora B Thr232 (pAuroraB T232) levels at kinetochores/centromeres in n≥75 neonatal and elderly metaphase cells treated with UMK57 for 24 hrs or 96 hrs. Intensity levels were normalized to ACA. Scale bar, 5µm.H) quantification (H) of phospho-Aurora B Thr232 (pAuroraB T232) levels at kinetochores/centromeres in n≥75 neonatal and elderly metaphase cells treated with UMK57 for 24 hrs or 96 hrs. Intensity levels were normalized to ACA. Scale bar, 5µm. Data Information: All values are mean ± s.d. of at least two independent experiments. ns p>0.05, * p<0.05, *** p<0.001, **** p<0.0001 by two tailed H) Mann-Whitney tests.
Figure 1A Immunostaining for the mitochondrial marker ATPβ in N2a cells expressing mito-QC. Data information: Data are given as mean and SEM, * = p < 0.05, **= p <0.01, **** = p < 0.0001 for simple effects. Scale bar = 5 µm in (A)B N2a cells expressing mito-QC and myc-Parkin together with hTau-V5, hP301L-V5 or an empty vector control. Treatment with CCCP (8 µM, 17 h) induces mitophagy in control cells, as indicated by a decrease in the GFP/mCherry fluorescence ratio, but not in hTau or hP301L cells. Deconvolution (Classic Maximum Likelihood Estimation) was applied to images for display only. C Quantification of GFP/mCherry fluorescence intensity per cell. Data were analysed by 2-way ANOVA, showing significant main effects of CCCP treatment, F (1, 314) = 15.66, p < 0.0001, and tau expression, F (2, 314) = 12.26, p < 0.0001, and a significant interaction effect, F (2, 314) = 6.137, p = 0.0024, n = 40-73 cells/group. Data information: Data are given as mean and SEM, * = p < 0.05, **= p <0.01, **** = p < 0.0001 for simple effects. Scale bar = 10 µmD Cells expressing mito-QC and myc-Parkin together with hTau-V5, hP301L-V5 or an empty vector control, treated with a mixture of antimycin and oligomycin (AO, 15 µM, 17 h). E Quantification of GFP/mCherry fluorescence intensity per cell. Data were analysed by 2-way ANOVA, showing no significant main effects of AO treatment, F (1, 212) = 0.564, p = 0.4534, or tau expression F (2, 212) = 1.579, p = 0.2087, but a significant interaction effect, F (2, 212) = 9.854, p < 0.0001, n = 16-50 cells/group. Data information: Data are given as mean and SEM, * = p < 0.05, **= p <0.01, **** = p < 0.0001 for simple effects. Scale bar = 10 µm
Figure 2A Illustration of the image analysis process. The inverted "Union Jack" look-up table (LUT) was used to better visualise GFP-Parkin clusters, which were then manually selected as regions of interest (ROIs) and the corresponding mitochondrial fluorescence intensity was measured. Data information: Data are given as mean and SEM, *= p < 0.05, ***= p < 0.001, ****= p < 0.0001. Scale bar = 10 μm.B Representative images of N2a cells expressing GFP-Parkin and hTau, hP301L or empty vector (Control) for 24 h, that were then treated with 10 μM CCCP for 4 h. Data information: Data are given as mean and SEM, *= p < 0.05, ***= p < 0.001, ****= p < 0.0001. Scale bar = 10 μm.C Quantification of Parkin clusters/cell at 24 h post-transfection. Data were analysed with a Kruskal-Wallis test, χ2 (2) = 8.18, p = 0.0168, followed by Dunn's post-hoc analysis, n = 33-38 cells/group. D Quantification of Parkin clusters/cell at 48 h post-transfection. Data were analysed with a Kruskal-Wallis test, χ2 (2) = 19.2, p < 0.0001, followed by Dunn's post-hoc analysis, n = 37-55 cells/group cells/group. Data information: Data are given as mean and SEM, *= p < 0.05, ***= p < 0.001, ****= p < 0.0001. Scale bar = 10 μm.E To assess colocalisation of Parkin clusters and mitochondria at 24 h post-transfection, Pearson correlations between the mean normalised fluorescence intensity of the Parkin clusters and the mitochondrial signal following CCCP treatment were calculated. Control r = 0.616, p = 0.0001; hTau r = 0.217, p = 0.2771; hP301L r = 0.548, p = 0.0014 (n = 27-34 cells/ group). F Pearson correlations between the mean normalised fluorescence intensity of the Parkin clusters and the mitochondrial signal following CCCP treatment at 48 h post-transfection. Control r = 0.434, p = 0.0167; hTau r = 0.128, p = 0.4941; hP301L r = -0.299, p = 0.2794 (n = 15-31 cells/ group). Note the different intensity scales between (E) and (F) reflect different bit depths of the images. Data information: Data are given as mean and SEM, *= p < 0.05, ***= p < 0.001, ****= p < 0.0001. Scale bar = 10 μm.
Figure 3A FACS analysis of cells loaded with Rhodamine 123. The geometric mean fluorescence was calculated and expressed as % of the empty vector control. A CCCP-treated cohort was included as a positive control, but not included in the statistical analysis. Data were analysed by one-way ANOVA, F (2, 14) = 0.196, p = 0.8245. B FACS analysis of cells treated with CCCP after 24 h of tau expression. Data were analysed by one-way ANOVA, F (2, 15) = 0.434, p = 0.6555. The DMSO negative control is shown but was not analysed statistically. Data information: Data are given as mean and SEM (n = 5-6 samples/ experimental group from two independent experiments).C Representative dot plots of cells loaded with Rhodamine 123. The gates (black line) were set in unstained cells to distinguish Rhodamine-positive cells (right half) from Rhodamine-negative cells (left half). Data information: Data are given as mean and SEM (n = 5-6 samples/ experimental group from two independent experiments).
Figure 4A Immunostaining for microtubules after transient expression of hTau and hP301L. Data information: Data are given as mean and SEM, ****= p < 0.0001. Scale bar = 10 µm.B Taxol induces microtubule bundling to a similar extent to tau expression. Data information: Data are given as mean and SEM, ****= p < 0.0001. Scale bar = 10 µm.C Representative images and quantification of Parkin clusters in N2a cells following CCCP and Taxol treatment (Mann-Whitney test, U = 22448, p < 0.0001, n = 224, 273 cells/group for CCCP only and CCCP + Taxol, respectively). Data information: Data are given as mean and SEM, ****= p < 0.0001. Scale bar = 10 µm.D Immunoblot analysis of acetylated tubulin (Ace-Tubulin) following expression of hTau and hP301L for 24 h (One-way ANOVA, F(2, 9) = 0.0432, p = 0.9579). Data information: Data are given as mean and SEM, ****= p < 0.0001. Scale bar = 10 µm.E Immunoblot analysis of tyrosinated tubulin (Tyr-Tubulin) following expression of hTau and hP301L for 24 h (One-way ANOVA, F(2, 9) = 0.0402, p = 0.9608). Data information: Data are given as mean and SEM, ****= p < 0.0001. Scale bar = 10 µm.F Representative images and quantification of Parkin clusters in N2a cells following treatment with CCCP and the actin stabiliser Jasplakinolide (JPL) (Mann-Whitney test, U = 16069, p <0.0001, n = 224, 199 cells/group for CCCP only and CCCP + JPL, respectively). Data information: Data are given as mean and SEM, ****= p < 0.0001. Scale bar = 10 µm.
Figure 5A Co-immunoprecipitations of V5-tagged tau and GFP-Parkin. The V5 tag was used to pull down tau and the membrane was probed for V5 (using an antibody raised in a different species) and GFP. IP = immunoprecipitation, Flow = flow-through lysate following removal of beads. Data information: Scale bars = 10 μm. Data are given as mean and SEM, ** = p < 0.01, **** = p < 0.0001.B Maximum projection images of proximity ligation assays (PLAs) for tau and endogenous Parkin in cells expressing hTau-GFP, hP301L-GFP or GFP. Inset = negative control (antibodies to tau and histone H3, which are not known binding partners). C Quantification of PLA signals in maximum projections normalised to the GFP signal. Results were analysed with a Kruskal-Wallis test, χ2 (2) = 27.2, p < 0.0001, followed by Dunn's post hoc analysis to test for differences from the GFP control, n = 17 cells in GFP condition, 14 cells in hTau condition and 27 cells in hP301L condition. Data information: Scale bars = 10 μm. Data are given as mean and SEM, ** = p < 0.01, **** = p < 0.0001.D PLA for Parkin and hP301L in an aged pR5 mice and a littermate control. Data information: Scale bars = 10 μm. Data are given as mean and SEM, ** = p < 0.01, **** = p < 0.0001.F, G PLA for Parkin and ∆Tau, revealing interactions via the projection domain of tau. Data were analysed with a Mann-Whitney test (U = 185, p = 0.9224, n = 21, 18 cells/group for hTau and ∆Tau, respectively). Data information: Scale bars = 10 μm. Data are given as mean and SEM, ** = p < 0.01, **** = p < 0.0001.H, I PLA for Parkin and the microtubule-binding domain construct (MTBD). Data were analysed with a t-test (t = 5.226, p < 0.0001, n = 16, 17 cells/group for hTau and MTBD, respectively). Data information: Scale bars = 10 μm. Data are given as mean and SEM, ** = p < 0.01, **** = p < 0.0001.J, K Cells expressing tau constructs together with GFP-Parkin (24 h) with and without CCCP treatment. Parkin clusters were counted, illustrating that Parkin translocation was impaired by ∆Tau, but not MTBD. Data were analysed with a Kruskal-Wallis test χ2 (2) = 10.4, p = 0.0056, followed by Dunn's post-hoc, n = 67, 42, 53 cells/ group for for hTau, ∆Tau, and MTBD, respectively. Data information: Scale bars = 10 μm. Data are given as mean and SEM, ** = p < 0.01, **** = p < 0.0001.L The V5 fluorescence intensity in each cell analysed in (K) (Mann-Whitney test, U = 953, p = 0.2332, n = 42, 53 cells/group for ∆Tau and MTBD, respectively). Data information: Scale bars = 10 μm. Data are given as mean and SEM, ** = p < 0.01, **** = p < 0.0001.M Cells were transfected with GFP-Parkin and hTau-V5, hP301L-V5 or an empty vector control, and treated with CCCP. PLAs were performed for tau and Parkin. Notably, at Parkin clusters (arrow), no interactions between tau and Parkin were evident. Data information: Scale bars = 10 μm. Data are given as mean and SEM, ** = p < 0.01, **** = p < 0.0001.N 3D reconstructions in IMARIS, illustrating a lack of PLA signals in Parkin clusters. Data information: Scale bars = 10 μm. Data are given as mean and SEM, ** = p < 0.01, **** = p < 0.0001.
Figure 6Expression pattern of the mito-Rosella biosensor in the nervous system.B Analysis pipeline of mitochondria in the C. elegans ventral nerve cord. Mitochondria were selected by choosing a threshold in the dsRed channel. This threshold was used to create ROIs around single mitochondria and the corresponding GFP fluorescence intensity was then measured.C, D Analysis of mitophagy in worms transgenic for mito-Rosella but not tau (WT), that were treated with NaN3 (8 mM, 1 h) or CCCP (15 µM, 2 h). Data were analysed by unpaired t test, NaN3 t = 5.56, p < 0.0001; CCCP t = 3.92 p = 0.0002. Data information: n = 16-25 worms/group for NaN3 and 23-39 worms/groups for CCCP experiments. Data are given as mean and SEM. *** = p < 0.001, **** = p < 0.0001. Scale bar = 10 µm. Images are high-magnification of a small number of mitochondria in the ventral cordE, F Analysis of mitophagy in worms expressing hTau in response to NaN3 treatment (unpaired t test, t = 1.62, p = 0.1126) and CCCP treatment (Mann-Whitney test, U = 113, p = 0.002). Data information: n = 16-25 worms/group for NaN3 and 23-39 worms/groups for CCCP experiments. Data are given as mean and SEM. *** = p < 0.001, **** = p < 0.0001. Scale bar = 10 µm.­­­­ Images are high-magnification of a small number of mitochondria in the ventral cordG, H Analysis of mitophagy in worms expressing hP301L in response to either NaN3 (Mann-Whitney test, U = 126, p = 0.2711) or CCCP (Mann-Whitney test, U = 375, p = 0.3697) treatment. Data information: n = 16-25 worms/group for NaN3 and 23-39 worms/groups for CCCP experiments. Data are given as mean and SEM. *** = p < 0.001, **** = p < 0.0001. Scale bar = 10 µm.­­­­ Images are high-magnification of a small number of mitochondria in the ventral cordI Tau expression in worm lysates, as detected using the human tau-specific antibody HT7.
Figure 1Survival of age- and sex-matched (8-10 week old) Spata2+/+ (WT) and Spata2-/- (KO) mice injected intraperitoneally (i.p.) with LPS (20 mg/kg bodyweight). Data pooled from three independent experiments are shown. Statistical analysis was performed using long-rank test.ELISA of serum IL-1β, IL-18, TNFα and IL-6 at 12 h after injection of WT or Spata2-KO mice with 20 mg/kg LPS. Circles and triangles represent individual mice. Horizontal bars indicate mean values. **P < 0.01; ****P < 0.0001. Statistical analysis was performed using unpaired two-tailed Student's t-test.Immunoblot analysis of the indicated phosphorylated (P) and total proteins in lysates of LPS-stimulated BMDMs derived from WT or Spata2-KO mice. Molecular weights in kDa are indicated to the right.qRT-PCR analysis of the indicated mRNAs in untreated or LPS-stimulated WT or Spata2-KO BMDMs. Bars and error bars represent the mean ± S.D. of triplicate experiments. Statistical analysis was performed using unpaired two-tailed Student's t-test.ELISA of TNFα and IL-6 in the supernatants from untreated or LPS-stimulated WT or Spata2-KO BMDMs. Bars and error bars represent the mean ± S.D. of triplicate experiments. Statistical analysis was performed using unpaired two-tailed Student's t-test.
Figure 2ELISA of IL-1β secretion by WT or Spata2-KO BMDMs that were either untreated (-) or LPS-primed and then treated with the indicated NLRP3 inducersELISA of IL-1β secretion by WT or Spata2-KO BMDMs that were either untreated (-) or stimulated with the NLRC4 inducer (Salmonella infection) or AIM2 inducer ( Poly(dA:dT) transfection) (B).Immunoblot analysis of the mature IL-1β p17 and the active Caspase-1 p20 in cell supernatants (Sup) and the indicated proteins in the cell extracts (Cell ext) of WT or Spata2-KO BMDMs stimulated as in (A).WT and Spata2 CRISPR knock out (KO) iBMDMs stably expressing GFP-ASC were primed with LPS and stimulated with Nigericin for 1 h. GFP-ASC specks were imaged by confocal microscope, and percentage of ASC speck-positive cells was quantified. Scale bar, 10 µm.BMDMs from Spata2+/+ (WT) and Spata2-/- (KO) mice were pretreated with Caspase-1 inhibitor, Z-YVAD-FMK, for 30 min, primed with LPS, and then stimulated with Nigericin for 1 h. ASC specks were assessed by Immunofluorescence with antibody against ASC and imaged by confocal microscope, and percentage of ASC speck-positive cells was quantified. Scale bar, 10 µm.Immunoblot analysis of ASC in soluble cell lysate and DSS cross-linked insoluble fraction of WT or Spata2-KO BMDMs primed with LPS and stimulated without or with nigericin (Nig) for 1 h. Relative levels of ASC in cross-linked samples from LPS+ Nig treated cells were quantitated and shown below.Spata2+/+ (WT) and Spata2-/- (KO) mice were injected intraperitoneally (i.p.) with alum (20 mg/kg bodyweight) and sacrificed 6 h latter to collect peritoneal lavages. Absolute numbers of neutrophils recruited to the peritoneum were counted by FACS (G)Spata2+/+ (WT) and Spata2-/- (KO) mice were injected intraperitoneally (i.p.) with alum (20 mg/kg bodyweight) and sacrificed 6 h latter to collect peritoneal lavages. levels of IL-1β (H) and IL-6 (I) in the peritoneal fluids were measured by ELISA.
Figure 3ELISA of IL-1β secretion by WT or CYLD KO BMDMs that were either untreated (-) or LPS-primed and then treated with the indicated NLRP3 inducers.Immunoblot analysis of IL-1β and active caspase-1 p20 in cell supernatants (Sup) and the indicated proteins in cell extracts (Cell ext) from WT and CYLD KO BMDMs, stimulated as in (A).BMDMs from WT and CYLD KO mice were pretreated with Caspase-1 inhibitor, Z-YVAD-FMK, for 30 min, primed with LPS, and then stimulated with Nigericin for 30 min. ASC specks were assessed by Immunofluorescence with antibody against ASC and the percentage of ASC speck-positive cells was quantified.LDH release from WT and Cyld KO BMDMs primed with LPS and stimulated as indicated.Immunoblotting analysis of active caspase-1 p20 and IL-1β in cell supernatants (Sup) and the indicated proteins in cell extracts (Cell ext) of WT iBMDMs and Spata2 KO iBMDMs reconstituted with WT Spata2 or a Spata2 mutant (F108A) defective in CYLD binding that were primed with LPS and stimulated with Nigericin for 1 h.