EMBO/SourceData huggingface dataset:
Figure 3Endocytosis of VE-cadherin in 17 h TNF-α treated HUVEC was induced by adding HL60-derived neutrophils for 20-30 min at 37°C and monitored by the internalization of preincubated mAb BV6, which was visualized in fixed cells with a secondary fluorescent antibody (white). Total VE-cadherin was stained with another mAb (red), nuclei stained with Hoechst (white). (A) HUVEC had been transfected prior to the experiment with control or PECAM-1-specific siRNA. Cell lysates were analyzed for expression levels of PECAM-1 and tubulin (below). Relative VE-cadherin internalization efficiency is given on the right.Endocytosis of VE-cadherin in 17 h TNF-α treated HUVEC was induced by adding HL60-derived neutrophils for 20-30 min at 37°C and monitored by the internalization of preincubated mAb BV6, which was visualized in fixed cells with a secondary fluorescent antibody (white). Total VE-cadherin was stained with another mAb (red), nuclei stained with Hoechst (white). (B) PECAM-1 siRNA treated HUVEC were transduced with WT PECAM-1-EGFP or PECAM-1-Y663,686F-EGFP. Expression levels of transduced PECAM-1 forms and of EGFP and VE-cadherin are shown in immunoblots (on the right). Relative VE-cadherin internalization efficiency is given on the right.
Figure 4A Transmigration of mouse neutrophils towards CXCL-1 through TNF-α-stimulated bEnd.5 cells transfected with control or SHP2-specific siRNA and pre-treated with anti-endomucin (7C7.1) or anti-PECAM-1 (Mec13.3) antibodies for 30 min at 37°C before addition of neutrophils. The transmigration rate is presented relative to that of control cells, set as 100%.B Transmigration of mouse neutrophils towards CXCL-1 through TNF-α-stimulated WT or Y731F primary mouse endothelial cells pre-treated with isotype-control or anti-PECAM-1 (2H8) antibodies for 30 min at 37°C prior to addition of neutrophils. The transmigration rate is presented relative to that of control cells, set as 100%.Extravasated leukocytes (C) in cremaster tissue from WT or Y731F VE-cadherin mice stimulated intrascrotally with IL-1β and treated i.v. with isotype-control or anti-PECAM-1 (2H8) antibodies for 4 h before intravital microscopy.adherent leukocytes (D) in cremaster tissue from WT or Y731F VE-cadherin mice stimulated intrascrotally with IL-1β and treated i.v. with isotype-control or anti-PECAM-1 (2H8) antibodies for 4 h before intravital microscopy.(D) and rolling flux fraction of leukocytes (E) in cremaster tissue from WT or Y731F VE-cadherin mice stimulated intrascrotally with IL-1β and treated i.v. with isotype-control or anti-PECAM-1 (2H8) antibodies for 4 h before intravital microscopy.
Figure 5A HUVEC were transduced with increasing titers of adenovirus expressing human SHP2. VE-cadherin was immunoprecipitated from cell lysates and precipitates as well as total cell lysates were analyzed by immunoblots for indicated antigens.B bEnd.3 cells were lysed and VE-cadherin or immature VE-cadherin was immunoprecipitated respectively with C5 or VD47 antibodies. Precipitates were blotted against pY731-VE-cadherin, β -catenin, plakoglobin, p120, α -catenin and VE-cadherin.C VE-cadherin-catenin complex was immunoprecipitated from HUVEC lysates and was either left untreated (no SDS) or treated with 0.2% SDS for 30 min at room temperature, followed by removal of SDS and addition of 2 μg recombinant human SHP2 for 30 min at 30°C. Precipitates were analyzed in immunoblots for pY731-VE-cadherin, plakoglobin, β-catenin and VE-cadherin. D Quantification of pY731 blot signals of three independent experiments (from C), with the signal intensity for untreated VE-cadherin set as 1. Molecular weight markers are indicated in kDa.
Figure 6A Transmigration of mouse neutrophils towards the chemokine CXCL-1 through TNFα-stimulated WT or Y731F primary endothelial cells, either pre-treated with vehicle control (DMSO) or Ca2+ chelator (MAPTAM) for 30 min at 37°C prior to addition of neutrophils. The transmigration rate is presented relative to DMSO-treated endothelial cells expressing WT VE-cadherin.B TNFα-activated bEnd.5 cells were treated with DMSO or MAPTAM, prior to incubation with antigen-stimulated mouse T cells for 30 min. VE-cadherin was immunoprecipitated from cell lysates and precipitates as well as total cell lysates were analyzed by immunoblots for indicated antigens. Quantification of pY731 blot signals of five independent experiments are shown below, with the signal intensity for the control sample (no T cells, vehicle-control) set as 100%.A Transmigration of mouse neutrophils towards the chemokine CXCL-1 through TNFα-stimulated WT or Y731F primary endothelial cells, either pre-treated with vehicle control (DMSO) or Ca2+ chelator for 30 min at 37°C prior to addition of neutrophils. The transmigration rate is presented relative to DMSO-treated endothelial cells expressing WT VE-cadherin. C Transmigration assays treatment with Blebbistatin.B TNFα-activated bEnd.5 cells were treated with DMSO prior to incubation with antigen-stimulated mouse T cells for 30 min. VE-cadherin was immunoprecipitated from cell lysates and precipitates as well as total cell lysates were analyzed by immunoblots for indicated antigens. Quantification of pY731 blot signals of five independent experiments are shown below, with the signal intensity for the control sample (no T cells, vehicle-control) set as 100%. treatment with Blebbistatin.E HUVEC transduced with lacZ or with SHP2 were either untreated (-) or treated (+) with thrombin for 30 min followed by immunoblotting either VE-cadherin immunoprecipitates or cell lysates for the indicated antigens on the right.
Figure 7HUVEC were transfected with control or VE-cadherin-specific siRNA and transduced with VE-cad FL or VE-cad FL-TS. Cell lysates were immunoblotted for VE-cadherin and actin.C Immunofluorescence staining for VE-cadherin of HUVEC transfected with control or VE‑cadherin specific siRNA (VE-cad kd) and transduced with VE-cad FL or VE-cad FL-TS. D HUVEC were either transfected with control or VE-cadherin targeting siRNA and transduced with VE‑cad FL or VE-cad FL‑TS. The tension sensor was immunoprecipitated from cell lysates using an anti-GFP antibody. Precipitates as well as total cell lysates were analyzed by immunoblotting for indicated antigens. Molecular weight markers are indicated in kDa. E, Quantification of FRET efficiency (percentage) in junctions of HUVEC expressing VE-cad FL or VE-cad FL-TS, after thrombin stimulation (1 U/ml) or under control conditions.
Figure 8A-C Quantification of FRET efficiency (percentage) in junctions of HUVEC expressing VE-cad FL (A, B) or VE-cad FL-TS (C). HUVEC were stimulated 4h with TNFα prior to adding IL-8 for 4 min, followed by flow with buffer alone (A) or together with PMNs (B, C). The connected data points represent FRET efficiency of same junctions compared before and after addition of flow/PMNs.D Quantification of FRET efficiency (percentage) in junctions of HUVEC expressing VE-cad FL or VE-cad FL-TS. Cells were either exposed to flow and PMNs or to flow alone, fixed using 4 % PFA and washed with PBS. FLIM measurements were performed at sites of transmigration (PMNs) or at junctions without PMNs (Flow).E Representative images of HUVEC expressing VE-cad FL at a site of PMN transmigration (left micrographs) or without PMN (right micrographs). Maximum intensity projection of a Z-stack of YPet fluorescence (VE-cadherin in green) and CellTracker DeepRed (PMN in red) is shown for the upper micrographs. The part of the PMN above the HUVEC monolayer is encircled in yellow and the part underneath in blue. The amplitude averaged lifetime of YPet per pixel (FLIM measurement) of the same cells is shown in the bottom micrographs.F HUVEC were grown on collagen-coated polyacrylamide gels of varying physiologic stiffness of 0.2 kPa and 20 kPa, and stimulated with TNFα for 17 h prior to adding HL60-derived neutrophils for 20 min. VE-cadherin was immunoprecipitated and precipitates as well as total cell lysates were analyzed by Western blotting for indicated antigens. Relative quantifications of pY731 blot signals adjusted to the amount of precipitated VE-cadherin are shown on the right
Figure 1B) Western blot on fractions obtained during SN preparation revealed the enrichment of both pre- and postsynaptic markers, but not glia marker (GFAP) in the SN fraction. Cytosolic markers were depleted, while nuclear markers were barely detected in the SN (n=4 biological replicates, *** p<0.001, ** p<0.01, * p<0.05; one sample t-test; error bars indicate SEM).C) Synaptoneurosomes were NMDAR-stimulated and incubated with radioactive 35S-methionine/cysteine mix for 15-120 min. After labeling, proteins were separated on SDS-PAGE and newly synthesized proteins in SN labeled with [35S] were visualized by autoradiography (left panel). To determine the contribution of mitochondrial and cytosolic translation the labeling was preceded by treatment with chloramphenicol (CAP, 50 μg/ml) or with puromycin (PURO, 3mM) respectively (right panel). After 1 hour after the stimulation, a significant increase in 35S-labelled proteins was observed (n=6 biological replicates, *** p<0.001; repeated measures one-way ANOVA, post-hoc Sidak's multiple comparisons test) and the CAP treatment did not affect the overall levels of de novo synthetized proteins (n=6 biological replicates, ns; p=0.220). In contrast, PURO treatment significantly inhibited de novo protein synthesis in synaptoneurosomes (n=6 biological replicates, ** p=0.0091, repeated measures one-way ANOVA, post-hoc Sidak's multiple comparisons test). Error bars indicate SEM.(D-F) Results of mass spectrometry (label free quantification - LFQ) analysis identifying proteins with increased abundance in NMDAR-stimulated (20 min) synaptoneurosomes. (D) Volcano plot (Whitney-Mann test, n=4 per group) showing abundance of identified proteins in stimulated synaptoneurosomes as compared to unstimulated. Mitochondrial proteins are depicted in orange. The vertical line defines the p-value statistical significance cut-off. (E) Biological functions of identified proteins annotated using DAVID. Third top functional category identified as mitochondrial ones. (F) Pie-chart showing percentage share of mitochondrial proteins among all identified upregulated proteins.
Figure 2(A-D) Results of high-resolution quantitative mass spectrometry analysis identifying proteins with increased abundance in stimulated synaptoneurosomes. Volcano plots (Whitney-Mann test, Benjamini Hochberg correction, n=5 per group) showing abundance of identified proteins in NMDAR-stimulated (20 min) synaptoneurosomes as compared to unstimulated using iTRAQ8-plex (A) and TMT10-plex (B) labelling methods. Mitochondrial proteins are depicted in orange. The vertical line defines the p-value statistical significance cut-off. For nine mitochondrial proteins their mRNA abundance on polyribosomes was quantified, the data is presented on Figure EV2. (C) Biological functions of proteins identified as significantly upregulated after NMDAR stimulation (assembled from all three proteomic analyzes: LFQ, iTRAQ8, TMT10(E) RNA absorbance profiles from polyribosomal fractionation of unstimulated and NMDAR-stimulated (20 min) synaptoneurosomes. Upon NMDAR stimulation, a fraction of mRNAs is shifted towards heavy-polyribosomal fraction, which represents actively translating ribosomes. The fraction of polyribosomes used for RNA-seq experiment is depicted.(F) Comparison of proteomic data with RNA-seq experiments on mRNAs associated with polyribosomes from synaptoneurosomal samples. Ribosome association of synaptoneurosomal mRNAs determined by normalizing RNA-seq values of polyribosome associated mRNA with total mRNA (y axis). Green dots represent mRNAs encoding proteins upregulated upon stimulation (identified in MS experiments) while orange dots represent mRNAs encoding mitochondrial proteins. Density curves for transcripts encoding mitochondrial proteins (orange) and upregulated proteins (green) detected by the mass spectrometry are present on the right side of the plot. Please note that both classes represent high abundant mRNAs with good ribosome association values. Transcripts with statistically significant increased or decreased abundance on the polyribosomes in response to the stimulation are depicted in red.
Figure 3(A) Respiration activity of permeabilized synaptoneurosomes (upper panel) as compared to permeabilized HEK293T (lower panel). Oxygen concentration (blue line) and oxygen consumption (red line) measured using O2k oxygraph are shown.(B) Blue native gel electrophoresis (BN-PAGE) analysis of mitochondrial respiratory chain complexes from synaptoneurosomes as compared to HEK293T mitochondria.(C) Detection of respiratory chain complexes and supercomplexes in SN and HEK293T mitochondria using BN-PAGE followed by Western blot using antibodies specific for: complex I (Ndufb8), complex II (Sdha), complex III (Uqcrc2), complex IV (Cox6a) and complex V (Atp5a). Note similar composition of OXPHOS supercomplexes and complexes in synaptoneurosomes as in cellular mitochondria.(D) Selected bands (1-8) visible in blue-native gel were excised and analyzed using mass spectrometry (LC-MS). Proteomic analysis confirms the presence of protein subunits of different respiratory chain complexes in indicated bands.
Figure 4(A) Synaptoneurosomes were NMDAR-stimulated and incubated with radioactive 35S-methionine/cysteine mix for 1h. Samples were separated using blue-native electrophoresis (BN-PAGE). Protein complexes were visualized by Coomassie staining (left) and autoradiography (right). Autoradiography of the BN-PAGE gel shows de novo synthetized mitochondrial proteins that are incorporated into respiratory chain complexes.To block protein import and incorporation of newly synthesized proteins into respiratory complexes the mitochondrial electrochemical potential was abolished by treatment with carbonyl cyanide m-chlorophenyl hydrazone (10 μM CCCP) (B) Protein complexes were separated on BN-PAGE and visualized by Coomassie staining and autoradiography. 1 hour after the stimulation, significant increase in 35S-labelled proteins was observed (B, n=4 biological replicates, * , ** p=0.0023; repeated measures one-way ANOVA, post-hoc Sidak's multiple comparisons test). Blocking protein import into the mitochondria significantly inhibited the incorporation of 35S-methionine into respiratory chain complexes when samples were incubated in the presence of CCCP (B; n=4 biological replicates, * p=0.02, repeated measures one-way ANOVA, post-hoc Sidak's multiple comparisons test)To block protein import and incorporation of newly synthesized proteins into respiratory complexes the mitochondrial electrochemical potential was abolished by treatment with VOA mixture (containing 1 μM valinomycin, 20 μM oligomycin, 8 μM antimycin) (C). Additionaly, in order to block protein synthesis, SN were pretreated with puromycin (PURO, 3mM) (C). Protein complexes were separated on BN-PAGE and visualized by Coomassie staining and autoradiography. 1 hour after the stimulation, significant increase in 35S-labelled proteins was observed C, n=5 biological replicates, ** p=0.0023; repeated measures one-way ANOVA, post-hoc Sidak's multiple comparisons test). Blocking protein import into the mitochondria significantly inhibited the incorporation of 35S-methionine into respiratory chain complexes when samples were incubated in the presence of VOA (C; n=5 biological replicates, ** p=0.0044, repeated measures one-way ANOVA, post-hoc Sidak's multiple comparisons test). Also, significant inhibition of 35S-methionine/cysteine incorporation into mitochondrial protein complexes in synaptoneurosomes was observed when samples were stimulated in the presence of puromycin (C, n=5 biological replicates, * p=0.0236, repeated measures one-way ANOVA, post-hoc Sidak's multiple comparisons test). Error bars indicate SEM.
Figure 5(B) Equal amounts of synaptoneurosomal samples isolated from mouse brains (Fmr1 KO and wild-type littermates) were permeabilized by saponin and assayed on MitoPlates for 2 hours. Results are presented as the average rate/min/µg of protein, +/- SEM (n=3 per genotype; two-way ANOVA, post-hoc Sidak's multiple comparisons test; *** p< 0.0001).(C) Mitochondrial O2 consumption rates in SN were measured by high-resolution respirometry in the presence of following respiratory substrates: malate, pyruvate, and glutamate for Complexes I-IV, succinate for Complexes II-IV, glycerol 3-phosphate for mGpDH-IV and ascorbate and TMPD for complex IV, and normalized to protein content. Fmr1 KO mitochondria show elevated levels of respiration in the presence of succinate as well as ascorbate and TMPD (*p=0.0483 and *p=0.0360 respectively, n=9 per genotype, paired two-tailed t-test). Data are presented as a box-and-whiskers graph (the box extends from 25th to 75th percentiles, central horizontal line is plotted at the median, whiskers show 5th - 95th percentile).(D) Ultrastructure of Fmr1 KO brain sections revealed important differences in mitochondria morphology when compared to wild-types. Mitochondria are indicated by arrows; presynaptic part in blue, postsynaptic part in green. 3 mice per genotype were analyzed. Scale bars, 0.5 µm.
Figure 1(A) The bar graph represents top 10 biological pathways upregulated in gene ontology (GO) based Reactome pathway analysis using a set of genes induced (1.5 fold, p<0.05 (Wald Test), 3 biological replicates) in RNA-seq analysis in IRGM shRNA knockdown HT29 cells compared to control shRNA cells. Heatmaps were generated for sentinel interferon-regulated genes (three biological replicates) using 'ComplexHeatmap' library using 'R' Bioconductor package where the gene expression matrix was transformed into z-score. The heat map was generated from the common genes present in the three GO terms indicated by the three black lines. The numbers on the bars indicate the p-value of that particular GO term.(D) The qRT-PCR validation of RNA- seq data in control and IRGM KD HT29 cells.(E) The bar graph represents the top pathways upregulated in GO-based Reactome pathway analysis using set of genes induced (1.5 fold, p<0.05 (Wald Test), 3 mice each group) in the brain of Irgm1-/- mice compared to Irgm1+/+ wild type mice. Heatmaps were generated for sentinel interferon-regulated genes (three biological replicates) using 'ComplexHeatmap' library using 'R' Bioconductor package where the gene expression matrix was transformed into z-score. The heat map was generated from the common genes present in the three GO terms indicated by the three black lines. The numbers on the bars indicate the p-value of that particular GO term.(H) The qRT-PCR validation of RNA- seq data in Irgm1+/+ and Irgm1-/- mouse brain.
Figure 2(A) Heat map of nucleic acid sensor proteins upregulated in IRGM KD HT29 cells and Irgm1-/- mouse brain and BMDMs.Western blot analysis to determine levels of nucleic acid sensor proteins with lysates of (B) HT29 control (henceforth IRGM+/+) and single allele CRISPR knockout IRGM cells (henceforth IRGM+/-),Western blot analysis to determine levels of nucleic acid sensor proteins with lysates of (C) HT29 cells stably expressing control shRNA or IRGM shRNA,Western blot analysis to determine levels of nucleic acid sensor proteins with lysates of (D) Irgm1+/+ and Irgm1-/- mouse brain (n=3 mice).(E) Western blot analysis to determine levels of adaptor proteins in control and IRGM+/- HT29 cells.(F) SDD-AGE followed by western blot analysis with a mitochondrial fraction from control and IRGM siRNA knockdown THP1 cells. Western blot analysis with cytoplasmic fraction was also performed.Western blot analysis performed with lysates of (G) control and stable IRGM shRNA knockdown HT29 cells (H) IRGM+/+ and IRGM+/- HT29 cellsWestern blot analysis performed with lysates of (I) Irgm1+/+ and Irgm1-/- mouse brain to determine levels of TBK1 protein.Western blot analysis performed with lysates of (J) IRGM+/+ and IRGM+/- HT29 cellsWestern blot analysis performed with lysates of (K-L) Irgm1+/+ and Irgm1-/- mouse brain to determine levels of IRF proteins.Western blot analysis performed with lysates of (M) IRGM+/+ and IRGM+/- HT29 cellsWestern blot analysis performed with lysates of (N) Irgm1+/+ and Irgm1-/- mouse brain to determine levels of STAT proteins (n=3 mice).Western blot analysis performed with lysates of (O) IRGM+/+ and IRGM+/- HT29 cells. 2 biological replicates are shown.Western blot analysis performed with lysates of (P) Irgm1+/+ and Irgm1-/- mouse brain to determine levels of ISG proteins (n=2 mice).(Q) Representative confocal image of immunofluorescence assay performed with IRGM+/+ and IRGM+/- HT29 cells stained with MX1 antibodies. Scale bar, 10 µm.
Figure 3(A) Immunoprecipitation (IP) analysis of the interaction between endogenous IRGM and endogenous RIG-I, cGAS, MDA5, TLR3, TLR4, TLR7, NLRC4, and AIM2 in THP-1 cell lysates. IgG (H), IgG heavy chain.(B-D) Co-immunoprecipitation (Co-IP) analysis of the interaction between (B) GFP-IRGM and Flag-RIG-I, (C) GFP-IRGM, and Flag-cGAS, (D) GFP-IRGM and Flag-TLR3 in HEK293T cell lysates. L.E, Long exposure of input blot. IgG (L), IgG Light chain; IgG (H), IgG heavy chain.(E) GST pull-down assay of in-vitro translated and radiolabelled myc-tagged cGAS, RIG-I, and TLR3 with GST or GST-tagged IRGM.(F) Western blot analysis with the lysates of HT-29 cells stably transfected with control or Flag-IRGM plasmid and probed with the indicated antibodies.(G-I) Western blot analysis with lysates of HEK293T cells transiently expressing GFP or GFP-IRGM and (G) Flag-RIG-I or (H) Flag-cGAS or (I) or Flag-TLR3.(J-K) The qRT-PCR analysis with RNA isolated from (J) control and Flag-IRGM stable HT-29 cells (K) THP-1 cells transiently transfected with control or Flag-IRGM plasmid.Luciferase reporter assays in HEK293T cells transiently transfected with ISRE reporter plasmid and other plasmids as indicated.Luciferase reporter assays in HEK293T cells transiently transfected with ISRE reporter plasmid and other plasmids as indicated.Luciferase reporter assays in HEK293T cells transiently transfected with ISRE reporter plasmid and other plasmids as indicated.(O) Western blotting analysis with lysates of control and untreated or Bafilomycin A1 (300 nM; 4 h and 8 h) treated Flag-IRGM expressing HT29 stable cell lines.(P) Western blotting analysis with lysates of control and untreated or chloroquine (50 µM; 4 h and 8 h) treated Flag-IRGM expressing HT29 stable cell lines.(Q) The qRT-PCR analysis with RNA isolated from untreated or Bafilomycin A1 (300 nM; 4 h, 8 h, and 12 h) treated control or Flag-IRGM expressing HT-29 stable cells as indicated.