EMBO/soda-nel huggingface dataset:
MAP4K4 associates with BIK1 to regulate plant innate immunity (2019)
Figure 1

Figure 1. MAP4K4 regulates flg22 responses

(A) ROS burst response in wild-type (WT) and map4k4 lines in response to 1 μM flg22. Values are means ± SEM, n = 16 (biological replicates). Results are representative of three independent experiments. Statistical analysis was performed using a one-way ANOVA with Tukey post-test, p < 0.01.

(B) qRT-PCR analysis of the expression of PTI marker gene FRK1 in wild-type and map4k4-1 seedlings 1 h after treatment with 1 μM flg22. Bars represent means ± SD based on three biological replicates, p < 0.01.

(C) Venn diagram of the overlap between the flg22-induced genes (fold change ≥2 and p-value ≤ 0.05) in wild-type and map4k4-1.

(D) Heat map of gene expression response to flg22 in wild-type and map4k4-1, red and blue indicate high and low expression levels.

(E) GO enrichment analysis of MAP4K4-dependent flg22-induced genes.

(F) qRT-PCR analysis of 14 days old seedlings treated with H2O or 1 µM flg22 for 1 hour. Values are the means of three biological replicates ± SD, p < 0.01.

Data information: (A, B, F) Different letters indicate statistical significant base on one-way ANOVA with Tukey post-test, samples sharing letters are not significantly different.
MAP4K4 associates with BIK1 to regulate plant innate immunity (2019)
Figure 2

Figure 2. MAP4K4 regulates immunity to DC3000

(A) left panel, map4k4-1 shows enhanced resistance to Pseudomonas syringae pv. tomato DC3000. The growth of Pst DC3000 after inoculation in the indicated genotypes (Col-0, white bars, map4k4-1, green bars). Bacterial titers were determined 2 hours (day 0) and 3 days after inoculation. Right panel, disease symptoms of wild-type and map4k4-1 at 3 days after inoculation. Values are the means ± SD, n = 6 (biological replicates), p < 0.01.

(B) map4k4-1 disease resistance phenotype was recovered to wild-type levels in two independent complementation lines, c867 and c872. Bacterial titers were determined as described above. Values are the means ± SD, n = 6 (biological replicates), p < 0.01.

(C) qRT-PCR analysis of PR1 expression levels in Col-0, map4k4-1 and c867 after mock (MgCl2) or Pst DC3000 inoculation, values are the means ± SD, n = 3 (biological replicates), p < 0.01.

(D) Flg22-protection assay. Col-0, map4k4-1 and c867 were pretreated with H2O or flg22 1 day before Pst DC3000 inoculation. The bacterial population was measured 3 days after infection. Values are the means ± SD, n = 6. **p < 0.01, Results are representative of three independent experiments.

Data information: (A-D) Statistical analysis were performed using a one-way ANOVA with Newman-Keuls multiple comparison tests or t-tests. n.s. indicate non-significant.
MAP4K4 associates with BIK1 to regulate plant innate immunity (2019)
Figure 3

Figure 3. MAP4K4 localizes to the plasma membrane and cytosol and associates with BIK1

(A) Subcellular localization of MAP4K4-GFP in Arabidopsis mesophyll protoplasts. MAP4K4-GFP (green) partially co-localized with the plasma membrane dye FM4-64 (red). 14 hours after transformation, photographs were taken when the plasma membrane of mesophyll protoplasts was stained by FM4-64 (< 3 min). Scale bars = 10 µm.

(B) Auto-phosphorylation of recombinant HisMBP-MAP4K4 wild-type, no auto-phosphorylation in the kinase-inactive HisMBP-MAP4K4-D139A protein. The phosphorylation level was determined by Pro-Q Diamond phosphoprotein gel stain (upper panel), protein loading amounts were visualized by Coomassie G-250 staining (lower panel). The predicted molecular weight of HisMBP-MAP4K4 is 118.4 kDa.

(C) BiFC visualization of interaction between MAP4K4 and BIK1 in Arabidopsis mesophyll protoplasts. BIK1-nYFP and MAP4K4-cYFP were co-expressed in protoplasts to show fluorescence of complemented YFP signal (green), 14 h after transformation, the results were photographed by confocal laser scanning microscopy, scale bars = 10 µm. Chl indicates Chloroplast, BF indicate Bright field. nYFP and cYFP constructs were used as empty controls. MAP3K5-K375M and MKK4 were used as control.

(D) MAP4K4 associates with BIK1 in vivo by Co-IP. BIK1-HA and MAP4K4-GFP were co-expressed in plants by crossing of 35S::BIK1-HA and 35S::MAP4K4-GFP transgenic lines. 14 days old plants were treated (+) with 1 µM flg22 or H2O (-) for 10 min. GFP trap beads were used for immunoprecipitation, and target proteins were detected by western blots using anti-GFP or anti-HA antibodies. The predicted molecular weight of BIK1-HA, MAP4K4-GFP is 49.3 kDa and 103.8 kDa respectively.
MAP4K4 associates with BIK1 to regulate plant innate immunity (2019)
Figure 4

Figure 4. MAP4K4 regulates BIK1 stability and activation

(A) Decreased BIK1 abundance in map4k4-1. 35S::BIK1-HA was introduced into map4k4-1 by crossing, sibling lines carrying either map4k4-1 or MAP4K4 genotype were isolated from F3 generation. BIK1 levels were detected by western blot analysis using anti-HA antibodies.

(B) MAP4K4 regulates BIK1 accumulation through the proteasome pathway. 10 days old 35S::BIK1-HA seedlings of WT or map4k4-1 were treated with DMSO (-) or the proteasome inhibitor MG132 (50 µM) for 5h, then the plants were collected for immunoblot analysis.

(C) Flg22-induced BIK1 phosphorylation assay. 10 days old 35S::BIK1-HA seedlings of WT or map4k4-1 were treated with H2O (-) or 1 µM flg22 for 15 min, BIK1 phosphorylation levels were detected by mobility-shift assay using anti-HA immunoblot.

(D, E and F) Identification of phosphorylation sites by LC-MS/MS analysis. Five residues in GST-BIK1-K105E were phosphorylated in vitro by HisMBP-MAP4K4. The peptide sequences are shown above the spectrum with the PH designating phosphorylated residue. In the spectrum, the matched fragment ions shows in red line for terminal series ions and in orange for immonium ions and modified ions.

(G) S233 and T242 were required for BIK1 hyper-phosphorylation. BIK1-HA, BIK1S233-HA and BIK1S242-HA mutants were expressed in Col-0 protoplasts and treated with 100 nM flg22 for 15 min, BIK1 phosphorylation levels were detected by mobility-shift assay using anti-HA immunoblot. Each experiment was performed at least three times with similar results.
MAP4K4 associates with BIK1 to regulate plant innate immunity (2019)
Figure 5

Figure 5. MAP4K4 associates and phosphorylates PP2C38

(A) MAP4K4 associates with PP2C38 in vivo by Co-IP. MAP4K4-GFP and PP2C38-HA were co-expressed in protoplasts. GFP trap beads were used for immunoprecipitation, and target proteins were detected by western blots using anti-GFP or anti-HA antibodies. The predicted molecular weight of MAP4K4-GFP and PP2C38-HA is 103.8kDa and 48.1 kDa respectively.

(B) Identification of phosphorylation sites by LC-MS/MS analysis. In vitro phosphorylation site of HisMBP-PP2C38 by HisMBP-MAP4K4. The peptide sequence is shown above the spectrum with the PH designating phosphorylated residue. In the spectrum, the matched fragment ions shows in red line for terminal series ions and in orange for immonium ions and modified ions.

(C) S77 is required for flg22-induced PP2C38 band shift. PP2C38-HA and PP2C38-S77A-HA were expressed in Col-0 and map4k4 protoplasts and treated with 1µM flg22 for 30 min. The phosphorylated PP2C38 was detected by western blot mobility shift assay.

(D) flg22-induced PP2C38 band shift was compromised in map4k4 mutants. PP2C38-HA were expressed in Col-0 and map4k4 protoplasts and treated with 1µM flg22 for 30 min.

(E) PP2C38 dephosphorylates MAP4K4 by its phosphatase activity. HisMBP-MAP4K4 was incubated with HisMBP-PP2C38 or HisMBP-PP2C38D88N D289N (phosphatase-inactive) or alone, and the phosphorylation level of MAP4K4 was determined by Pro-Q Diamond phosphoprotein gel stain. All the experiments were performed three times with similar results.
MAP4K4 associates with BIK1 to regulate plant innate immunity (2019)
Figure 6

Figure 6. MAP4K4 regulates BIK1-mediated immunity

(A) BIK1 transgene restores flg22-induced ROS burst in map4k4-1. 35S::BIK1-HA WT or 35S::BIK1-HA map4k4-1 were generated by crossing as described before. ROS burst response in the indicated genotypes in response to 1 μM flg22. Values are means ± SEM, n = 16. Results are representative of three independent experiments.

(B) Morphological phenotype of 6-week-old of Col-0, map4k4-1, bik1 and map4k4-1 bik1 mutants.

(C) ROS burst response in Col-0, map4k4-1, bik1 and map4k4-1 bik1 mutants. Values are means ± SEM, n = 16. Results are representative of three independent experiments.

(D) Relative expression level of PR1 in Col-0, map4k4-1, bik1 and map4k4-1 bik1mutants by qRT-PCR analysis. Values are means ± SD, n = 3 (biological replicates).

(E) Morphological phenotype of 6-week-old of Col-0, map4k4-1, map4k3 and map4k4-1 map4k3 mutants.

(F) Relative expression level of PR1 in Col-0, map4k4-1, map4k3 and map4k4-1 map4k3 mutants by qRT-PCR analysis. Values are means ± SD, n = 3 (biological replicates).

(G) ROS burst response in Col-0, map4k4-1, map4k3 and map4k4-1 map4k3 mutants. Values are means ± SEM, n = 16 (biological replicates).

Data information: Different letters indicate statistical significant base on one-way ANOVA with Tukey post-test, samples sharing letters are not significantly different, p < 0.05.
Phosphoproteomics identifies microglial Siglec-F inflammatory response during neurodegeneration (2020)
Figure 1

Figure 1. Cross-model phosphoproteomics analysis identifies changes in signaling pathways.

(A) Workflow showing phosphopeptide enrichment strategy. Brain regions were dissected from mice and then processed into proteolytic peptide digests and labeled for quantification with TMT. Phosphopeptides were then enriched and analyzed by liquid chromatography followed by tandem-mass spectrometry.

(B-C) Heatmaps of enriched hippocampus phosphotyrosine peptides in hippocampus tissue from (B) CK-p25 and (C) 5XFAD animal mice. Colors indicate fold change relative to control animals on a log2-scale. Row colors (left) indicate peptides from predicted cell-type specific proteins. Green = Astrocyte, Orange = Neuron, Blue = Microglia, Purple = Oligodendrocyte.

(D) Phosphosite enrichment analysis of phosphopeptides from CK-p25, 5XFAD, and Tau mice. Circle colors indicate normalized enrichment scores (NES) and sizes indicate the number of observed sites in each substrate phospho-set within each mouse model. Kinases enriched in at least one model are shown.

(E) Heatmap showing enriched hippocampus phosphotyrosine peptides from 6 month old Tau P301S animals. Legend is same as (B).

(F-G) Relative abundances across all tissues for phosphotyrosine peptides: (F) SVyTEIK (Siglec-F pY561); (G) LyDFVK (Inpp5d pY868). Bars indicate mean ± 95% confidence interval (CI); n = 3-8 samples; *: p < 5e-2, **: p < 1e-2, ***: p < 1e-3, ****: p < 1e-4; ns: not significant, using unpaired Student's t-test, two-sided.
Phosphoproteomics identifies microglial Siglec-F inflammatory response during neurodegeneration (2020)
Figure 2

Figure 2. Siglec-F and Siglec-8 are upregulated in microglia across models of neurodegeneration.

(A) Immunofluorescence (IF) staining showing Siglec-F and Iba1 localization in hippocampus CA3 region of 3wk induced CK (top) or CK-p25 (bottom) mice. Scale bars = 50 μm. Colors are: Magenta = Iba1, Cyan = Siglec-F. Images are 60x super-resolution max z-stack projections taken from coronal slices.

(B-C) Percent area coverage of (B) Iba1 and (C) Iba1-proximal Siglec-F between CK and CK-p25 mice across hippocampal regions. Bars indicate mean ± 95% CI; n = 3-4 animals; *: p < 5e-2, **: p < 1e-2, ***: p < 1e-3, ****: p < 1e-4; ns: not significant, using unpaired Student's t-test, two-sided.

(D-E) IF staining of Siglec-F and Iba1 in (D) 5XFAD 2 month hypothalamus (HY) and (E) 5XFAD 6 month dentate gyrus (DG). Yellow = Aβ from methoxy X04 (D) or D54D2 (E). Scale bars = 50 μm.

(F) Percent area coverage of Iba1-proximal Siglec-F relative to total Iba1 across all analyzed thalamic, cortical, and hippocampal regions of 6 month WT (non-Tg) and 5XFAD mice. Box indicates quartiles and whiskers indicate the last datum within 1.5 inter-quartile range; n = 15-40 images (3-5 animals); *: p < 5e-2, **: p < 1e-2, ***: p < 1e-3, ****: p < 1e-4; ns: not significant, using unpaired Student's t-test, two-sided.

(G) Percent area coverage of Siglec-F localized to Iba1 compared to total Aβ plaque volume in each field of view across all analyzed images from 5XFAD and non-Tg control mice. Linear regression R2 value is shown for images with ≥10 μm2 total amyloid volume.

(H) Cumulative distribution function (CDF) of the distance between Siglec-F+ and Iba1+ mask voxels and nearest Aβ plaques in 6 month 5XFAD mice. Each value in the CDF represents the mean distance calculated from a single z-stack of a ROI containing ≥ 1 plaque of size ≥10 μm2. n = 55 images (4 animals).

(I-J) Relative RNA abundances for Siglec-8 in (H) hippocampus and (I) posterior cingulate cortex post-mortem patient tissue. Linear regression R2 values are shown on plots.

(K) IF staining showing Siglec-8 and Iba1, and MHC-II in cortical white matter tissue from a patient with late-onset AD (20x wide-field; Case ID: 01-43). Scale bars = 50 μm. Images are 60x super-resolution max z-stack projections.

(L-M) Percent area coverage of Siglec-8 localized to Iba1 or MHC in individuals with non-AD or AD. In (K) each point represents one WM or GM region average from each individual. In (L) values and statistics are shown for each image analyzed. Boolean mask operators indicate: ° = mask dilation, ⋂ = intersection, ⋃ = union, NOT = inverse mask. Box indicates quartiles and whiskers indicate the last datum within 1.5 inter-quartile range; n = 8-43 images (n = 1 ND, 3 early-onset AD, 4 late-onset AD); *: p < 5e-2, **: p < 1e-2, ***: p < 1e-3, ****: p < 1e-4; ns: not significant, using unpaired Student's t-test, two-sided.
Phosphoproteomics identifies microglial Siglec-F inflammatory response during neurodegeneration (2020)
Figure 3

Figure 3. Siglec-F and Siglec-8 are upregulated in BV-2 cells and iMGLs by IFNγ stimulation.

(A) Flow cytometry quantification of BV-2 Siglec-F expression levels. Cells were cotreated with 0-10 ng/mL IFNγ and 0-10 μM tofacitinib. Values are geometric mean fluorescence intensities (gMFI). Bars indicate mean ± 95% CI; n = 2-4 replicates; *: p < 5e-2, **: p < 1e-2, ***: p < 1e-3, ****: p < 1e-4; ns: not significant, using unpaired Student's t-test, two-sided. Dotted line indicates mean of untreated group.

(B) IF staining of iMGLs treated with IFNγ. Siglec-8 fluorescence is only shown on non-nuclear (Hoechst 33342-) regions. Images are 60x super-resolution max z-stack projections. Colors are: Red = Iba1, Green = Siglec-8, Blue = 33342. Scale bars = 20 μm.

(C) Quantification of Siglec-8 on iMGLs treated with PBS or 25 ng/mL IFNα, IFNβ, or IFNγ. Values are mean Siglec-8 intensity values from Iba1+;33342- regions. Bars indicate mean ± 95% CI; n = 8 images (2 replicates); *: p < 5e-2, **: p < 1e-2, ***: p < 1e-3, ****: p < 1e-4; ns: not significant, using unpaired Student's t-test, two-sided. Dotted line indicates mean of untreated group.

(D) Quantification of Siglec-8 on iMGLs treated ± 25 ng/mL IFNγ and 5 μM tofacitinib. Legend is same as (C). Bars indicate mean ± 95% CI; n = 5-20 images (2 replicates); *: p < 5e-2, **: p < 1e-2, ***: p < 1e-3, ****: p < 1e-4; ns: not significant, using unpaired Student's t-test, two-sided. Dotted line indicates mean of untreated group.
Phosphoproteomics identifies microglial Siglec-F inflammatory response during neurodegeneration (2020)
Figure 4

Figure 4. Siglec-F and related human Siglecs drive a pro-inflammatory response in BV-2 cells.

(A) Confluency doubling times quantified from BV-2 cells with stable retroviral expression of Siglec-F and related human Siglec constructs. Plots indicating doubling time (normalized to 2xY->F constructs) estimated from Incucyte bright-field images. Cells grown in media alone or + 50 mU sialidase (+SA). Bars indicate mean ± 95% CI; n = 3-12 replicates; *: p < 5e-2, **: p < 1e-2, ***: p < 1e-3, ****: p < 1e-4; ns: not significant, using unpaired Student's t-test, two-sided. Dotted line indicates mean of 2xY->F groups.

(B) Flow cytometry quantification of cell live / dead markers Annexin-V and propidium iodide on BV-2 cells with stable retrovirus expression of Siglec-F constructs. % parent values are shown for early apoptotic (Annexin-V+;PI‑), late apoptotic (Annexin-V+;PI‑), and necrotic (Annexin-V-;PI+) populations. Bars indicate mean ± SD; n = 8 replicates.

(C) Confluency doubling times quantified from BV-2 cells with dox-inducible expression of Siglec-F constructs. Plots indicating doubling time (normalized to 2xY->F constructs) estimated from Incucyte bright-field images. Bars indicate mean ± SD; n = 8 replicates; *: p < 5e-2, **: p < 1e-2, ***: p < 1e-3, ****: p < 1e-4; ns: not significant, using unpaired Student's t-test, two-sided. Dotted line indicates mean of 2xY->F group.

(D) Selected gene expression changes (top) and enriched gene sets (bottom) taken from RNA-seq analysis of BV-2 cells with stable retroviral expression of Siglec constructs, 2xY->F, and empty vector controls. Heatmaps share a colormap range of 0.25 to 4 for z-score values (top), normalized enrichment scores (NES, bottom).

(E) Quantification and overlap of differentially expressed genes (DEGs) between each Siglec-expressing BV-2 cell line. DEGs were calculated for each Siglec gene compared to respective 2xY->F mutants (upregulated: p < 1e-8, FC > 1.5; downregulated: p < 1e-8, FC < 0.66).

(F) Expression levels of C1qa, IL-1β, and β-actin by qPCR analysis in BV-2 cells with inducible Siglec-F expression after 48 hours of treatment with 500 ng/mL doxycycline. Fold Change values are equal to 2ΔΔCq normalized relative to GADPH mRNA levels. Bars indicate mean ± 95% CI; n = 6 replicates; *: p < 5e-2, **: p < 1e-2, ***: p < 1e-3, ****: p < 1e-4; ns: not significant, using unpaired Student's t-test, two-sided. Dotted line indicates mean of 2xY->F group.

(G) Western blot showing pro-IL-1β and β-tubulin in BV-2 cells induced to express Siglec-F at 0 and 48 hours.
Phosphoproteomics identifies microglial Siglec-F inflammatory response during neurodegeneration (2020)
Figure 5

Figure 5. Siglec-F perturbs phosphotyrosine signaling pathways in BV-2 cells.

(A) Experimental design for phosphotyrosine analysis of BV-2 cells with stable expression of Siglec and corresponding 2xY->F mutants. Samples were run as three 10-plex experiments: (1) Siglec-F: WT vs. 2xY->F; (2) Siglec-F, CD33, Siglec-5, and Siglec-8: WT vs 2xY->F; (3) Siglec-F: WT vs. 2xY->F ± 1 μM SHP099. Phosphotyrosine peptides were enriched and analyzed by LC-MS/MS.

(B-C) Volcano plots showing phosphotyrosine peptides that were (B) increased or (C) decreased after Siglec-F expression. Plots show Siglec-F compared to 2xY->F mutant data integrated across all three runs. Protein names are shown for altered peptides. Labels are only shown for peptides with maximum directional change from each protein. Labels colored according to GO terms: magenta = signal transduction, red = endosome, cyan = cell adhesion, yellow = cytoskeleton, green = metabolism.

(D) Heatmap showing phosphosites in CK-p25 which overlapped in their directional change with BV-2 Siglec-F-associated sites. Colors indicate fold change relative to 2xY->F controls.

(E-F) Heatmap showing phosphosites from CD33, Siglec-5, and Siglec-8 overexpression that were (E) increased or (F) decreased with Siglec expression and shared their directional change with Siglec-F. Siglec-F column indicates average of all untreated Siglec-F replicates. Color scale is same as (D).

(G) Western blot quantification of myc, SHP-2, and SHP-1 from myc co-IP eluates. Co-IP lysates were prepared from BV-2 cells stably expressing Siglec-F and optionally treated with 1 μM SHP099.

(H) Heatmap showing phosphosites that were perturbed by SHP099 treatment. Color scale is same as (D).
Coenzyme A corrects pathological defects in human neurons of PANK2 associated neurodegeneration (2016)
Figure 1

Figure 1. Development and characterization of hiPSC-derived neurons from controls and PKAN patients.

A Representative IF image of NPCs stained for Nestin, FoxG1 and Pank2. B NPCs differentiated into neurons by overexpressing Ngn2 (one representative experiment is shown). Two weeks after the infection differentiated NPC were positive for neuronal markers βIII-tubulin (Tuj1), Map2, NeuN and human nuclei (hNu) and synaptic markers, the voltage-gated Na+ channels (PanNav) and the vesicular glutamate transporter 1 (VGlut1). C Western blot of soluble cell homogenates from human neurons probed with PANK2 and β-actin antibodies (arrows). Asterisk indicates nonspecific band. Data are representative of three independent experiments. D Plots showing the total dendritic length and branching points. Data presented as mean and + SEM from at least three independent experiments. A total of 38 neurons were counted for each sample. Statistics were determined by the t-test and resulted not significant. E Representative example of co-culture containing control (green), PKAN (red) human neurons, and E18 cortical mice neurons. Control and PKAN NPCs were infected with GFP-LV and tdT-LV expressing vectors, respectively, and differentiated for 8 weeks. Scale bars 20 μm. F Examples of electrophysiological properties of human neurons: control individual (top); PKAN patient (bottom). Traces on the left represent trains of action potentials induced by injection of a suprathreshold current step through the patch electrode in current-clamp mode. Middle traces show Na+ and K+ currents (down- and upward-deflecting from baseline, respectively) in response to a 60 mV step from a holding voltage of -70 mV in voltage-clamp mode. Insets on the right display enlarged portions of the traces to magnify fast Na+ currents. G Histogram with percentages of recorded cells showing repetitively firing (z-test).
Coenzyme A corrects pathological defects in human neurons of PANK2 associated neurodegeneration (2016)
Figure 2

Figure 2. Mitochondrial membrane potential and morphology were affected in PKAN human neurons.

A Representative images of human neurons cells stained with the mitochondrial membrane potential sensible fluorescent probe TMRM, the neuronal specific anti-NCAM antibody and the nuclear staining Hoechst. Left panel, basal conditions. Right panel, after addition of the mitochondrial uncoupler FCCP. Scale bar 20 μm. Plot showing the quantification of TMRM fluorescence signal from NCAM+ neurons. Data presented as means + SEM of three independent experiments (unpaired, two-tailed t-test). B Representative images of ultrastructural analysis of fixed neurons examined with electron microscope. PANK2 panel represents PKAN neuronal cells overexpressing PANK2 protein. Scale bar 500nm. Mitochondrial size was measured at level of the larger diameter along the perpendicular axis for all the mitochondria in >30 field (200 mitochondria in total) for each sample (one-way ANOVA). C OCR measurements of controls and each PKAN patients analyzed individually and D data obtained by individual analysis and plotted as grouped controls, PKAN patients and PKAN patients overexpressing PANK2. The plots show OCR normalization to cell number. OCR was measured in basal conditions, and after oligomycin and FCCP addition. Bars indicate means + SEM of three independent experiments (Two-way ANOVA).
Coenzyme A corrects pathological defects in human neurons of PANK2 associated neurodegeneration (2016)
Figure 3

Figure 3. PKAN human neurons show altered oxidative status.

A Representative images of neurons stained with the neuron specific anti-NCAM antibody, ROS sensible fluorescent probe DCF, and the nuclei dye Hoechst. Scale bar 20 μm. Plots of the DCF fluorescence signal from NCAM positive controls- and PKAN human neurons, infected or not with Ngn2-PANK2-LV. Data presented as means + SEM of at least three independent experiments (One-way ANOVA). B Representative images of neurons stained with ThiolTracker Violet and the anti Tuj1. Scale bar 20 μm. ThiolTracker Violet fluorescence signal from Tuj1 positive neurons were quantified and shown in the plots. Data presented as means + SEM of at least three independent experiments (unpaired, two-tailed t-test).