EMBO/SourceData huggingface dataset:
Figure 2(A) Total to oxidized glutathione ratio (GSH/GSSG) in mock infected or HIV-1 infected CD4+ T-cells (7 dpi, n=4 biological replicates; mean±SEM).representative picture (B) of ROS content in HIV-1 infected or mock infected primary CD4+ T-cells at 7dpi (productive infection) and 14 dpi (latent infection). ROS content was measured by immunofluorescence, HIV-1 DNA+ cells were identified by FISHquantification of ROS content in HIV-1 infected or mock infected primary CD4+ T-cells at 7dpi (productive infection) and 14 dpi (latent infection). ROS content was measured by immunofluorescence, HIV-1 DNA+ cells were identified by FISH (D). The black dash in (C) indicates the median. Box plots in (D) depict median and 25-75 percentile, while whiskers extend from min to max. n= number of cells. Scale bar = 2μm.(E) Subcellular localization of Nrf2 in CD4+ T-cells infected with HIV-1 or mock infected (3dpi) as analyzed by biochemical fractionation and western blot; Whole Cell Extract (WCE), Cytoplasm (Cyt), Nucleoplasm (Nuc).(F) Nuclear localization (left) and content (right) of Nrf2 in HIV-1 RNA+ and HIV-1 RNA- cells (7dpi) as measured by combining immunofluorescence and HIV-1 RNA FISH. Black dash indicates median, n= number of cells. Scale bar = 2μmTime course of the mRNA levels of main downstream antioxidant targets of Nrf2 during the transition from productive (3-9 dpi) to latent (14 dpi) infection, as measured by qPCR Data in (G) are depicted as mean±SEM of 3 biological replicates. raw data were first normalized using 18S as housekeeping control and then expressed as Log2 fold mRNA expression in infected vs mock infected cells Trx= thioredoxin; NQO1= NAD(P)H [quinone] dehydrogenase 1; HMOX-1= heme oxygenase 1; G6PD= glucose-6-phosphate dehydrogenase; GCLC= glutamate-cysteine ligase ; TrxR1= thioredoxin reductase 1. Time course of the protein levels of main downstream antioxidant targets of Nrf2 during the transition from productive (3-9 dpi) to latent (14 dpi) infection, as measured by western blot GCLC and HMOX-1 in (H) were probed upon membrane stripping.(I) Relative mRNA expression of Nrf2 downstream antioxidant targets in J-Lat 9.2 cells left untreated (latent) or treated for 24h with 10µM TPA (reactivated). Data are depicted as mean±SEM of 3 biological replicates. raw data were first normalized using 18S as housekeeping control and then expressed as Log2 fold mRNA expression in TPA-reactivated vs latent cells Trx= thioredoxin; NQO1= NAD(P)H [quinone] dehydrogenase 1; HMOX-1= heme oxygenase 1; G6PD= glucose-6-phosphate dehydrogenase; GCLC=
Figure 3(A) gag mRNA expression (left) and relative viability (right) of HIV-1 infected Jurkat-TAg cells transfected with non targeting siRNA (NC) or siRNAs targeting the HMOX-1 gene. Cells were infected 24hr post-transfection and assayed for mRNA expression (by qPCR) or viability (by MTT assay) 48hr post-infection. Data (mean±SEM; n=3 technical replicates) were normalized using the NC control and analyzed by unpaired t-test. P<0.05; **P<0.01.(B RNA-Seq analysis of different time points of primary CD4+ T-cells infected in vitro with HIV-1 or mock infected. The gene set used for the analyses is GO iron ion import (12 genes, GO:0097286). Data in (B) were analyzed by Fisher test. Boxplots depict median and 25-75 percentiles while whiskers extend from the hinge to the highest or lowest value that is within 1.5 * IQR (inter-quartile range) of the hinge. Data beyond the end of the whiskers are outliers and plotted as points. Dots below boxplots illustrate, for each time point, the pathway enrichment analysis of genes up-regulated in infected vs matched mock-infected controls. Dots are color-coded based on the enrichment q-values and their size indicates the fraction of DEGs in the pathway; grey dots are not statistically significant.(C) Heatmaps of the standardized expression of the GO iron ion import pathway genes in HIV-1 infected and mock infected samples over time. Expression levels were standardized [(mean gene expression - SD)/SD] for each gene in each time point. The TFRC (TfR1) gene, which was considered for further analysis, is highlighted.(D) TfR1 expression in HIV-1 infected or mock infected CD4+ T-cells as visualized by confocal microscopy. Fluorescent values shown were calculated as described in (McCloy et al, 2014). Data were analyzed by one-way ANOVA followed by Sidak´s post-test to compare corresponding mock infected vs infected pairs. Black dash indicates median, n= number of cells. Scale bar = 2μm.(E) Western blot (upper panel) and relative expression (lower panel) of FTH-1 protein in HIV-1 infected vs mock infected CD4+ T-cells over time. Western blot quantification was performed with Fiji-Image J (Schindelin et al, 2012), normalized to the housekeeping protein beta-actin and expressed as Log2 fold change in HIV-1 infected vs mock infected cells (mean±SEM; n=3 biological replicates). P<0.05;(F) Percentage of intracellular p24+ gag CD4+ T-cells infected with HIV-1 and left untreated or treated for 48hr with the iron donor Fe-NTA at 150μM concentration (n=3; mean ± range of three biological replicates).(G) Percentage of GFP+ J-Lat cells (clones 9.2 and 15.4) left untreated or treated for 48hr with TPA (10μM), the iron donor FeNT (150μM) or a combination of the two. Data are expressed as mean±SEM of four technical replicates for each cell line and were analyzed by one-way ANOVA followed by Tukey´s post-test. *P<0.05; ***P<0.001; ****P<0.0001.
Figure 4(A RNA-Seq analyses of different time points in primary CD4+ T-cells infected in vitro with HIV-1 or mock infected. Data were analyzed by Fisher test (number of donors =3 biological replicates). Boxplots in depict median and 25-75 percentiles while whiskers extend from the hinge to the highest or lowest value that is within 1.5 * IQR (inter-quartile range) of the hinge. Data beyond the end of the whiskers are outliers and plotted as points. For each time point, dots below boxplots illustrate the pathway enrichment analysis of genes up-regulated in infected vs matched mock infected controls. Dots are color-coded based on the enrichment q-values and their size indicates the fraction of differentially expressed genes in the pathway; grey dots are not statistically significant. The gene set considered for the analyses is Biocarta_PML_pathway (17 genes, M4891).B) proteomic analyses of different time points in primary CD4+ T-cells infected in vitro with HIV-1 or mock infected. Data were analyzed by Fisher test (number of donors =3 biological replicates). Boxplots in depict median and 25-75 percentiles while whiskers extend from the hinge to the highest or lowest value that is within 1.5 * IQR (inter-quartile range) of the hinge. Data beyond the end of the whiskers are outliers and plotted as points. For each time point, dots below boxplots illustrate the pathway enrichment analysis of proteins up-regulated in infected vs matched mock infected controls. Dots are color-coded based on the enrichment q-values and their size indicates the fraction of differentially expressed proteins in the pathway; grey dots are not statistically significant.(C Western blot of PML protein in HIV-1 infected vs mock infected CD4+ T-cells over time. Raw data were normalized using actin (protein) as housekeeping control and expressed as Log2 fold change expression in infected vs mock infected cells.D) relative expression PML mRNA in HIV-1 infected vs mock infected CD4+ T-cells over time. Raw data were normalized using GAPDH or 18S (mRNA) as housekeeping control and expressed as Log2 fold change expression in infected vs mock infected cells. Data were analyzed by two-way ANOVA followed by Tukey´s post-test (mean±SEM of 3 and 4 biological replicates for PML mRNA(E) Western blot and quantification of PML protein in two different clones of J-Lat cells left untreated or treated with TPA for 24h. Data were analyzed by unpaired t-test (mean±SEM; n=3 technical replicates for each cell line).(F PML protein expression in CD4+ T-cells infected with HIV-1 or mock infected at 7dpi as measured by western blot. Cells were left untreated or treated with the antioxidant compound NAC (10mM, F)G) PML protein expression in CD4+ T-cells infected with HIV-1 or mock infected at 7dpi as measured by western blot. Cells were left untreated or treated with the iron chelator deferiprone (L1, 50μM, G).
Figure 5(A Representative image and quantification of the number of PML NBs in HIV-1 DNA+ vs mock infected CD4+ T-cells. Scale bars = 2μm. Infected cells were identified with DNA FISH and PML NBs were stained by IF.B) Representative image and quantification of the number of PML NBs in HIV-1 RNA+ vs HIV-1 RNA- CD4+ T-cells. Scale bars = 2μm. Infected cells were identified with RNA FISH and PML NBs were stained by IF.
Figure 6Representative immunofluorescence images and quantifications of PML NBs (green, maximal projection) and mab414/nuclear pore (red, one Z stack) in J-Lat 9.2 cells. Cells were left latent or reactivated for 24 hrs with 10μM TPA. Proteasome function was blocked for 4 hrs in both latent and TPA reactivated cells using MG132 (10μM) or Bortezomib (100nM)Representative immunofluorescence images and quantifications of PML NBs (green, maximal projection) and mab414/nuclear pore (red, one Z stack) in J-Lat 9.2 cells. Cells were left latent or reactivated for 24 hrs with 10μM TPA. Alternatively, ubiquitination was blocked for 4 hrs using TAK243 (10μM)(E,F) Representative immunofluorescence images (E) and quantification (F) of PML NBs (green) and SUMO 2/3 (red) in J-Lat 9.2 cells left latent or reactivated for 24 hours with 10μM TPA. Cells were imaged by STED microscopy, scale bar 2 μm.(G,H) Representative immunofluorescence images (G) and quantification (H) of PML NBs (green, maximal projection) and SUMO 2/3 (red, maximal projection) during mock and productive HIV-1 infection of primary CD4+ T-cells at 7dpi. Scale bar 10μm.
Figure 1A S. cerevisiae wt or hsp42Δ cells expressing mCherry‐VHL (red) and GFP‐luciferase‐DM‐NLS (green) were grown at 30°C and shifted to 37°C for 90 min. MG132 was added prior to temperature upshift. Changes in protein localizations were recorded. DNA was stained by DAPI (blue).B S. cerevisiae wt cells or hsp42Δ cells expressing GFP‐VHL (green) were treated as in (A). Nuclear membranes were visualized by Nsp1immunofluorescence microscopy labeling (red).C S. cerevisiae wt cells or hsp42Δ cells expressing mCherry‐VHL (red) and GFP‐Nup49 (green) were treated as in (A). Three‐dimensional reconstructions of respective cells are given.D Time‐lapse microscopy of wt cells expressing mCherry‐VHL (green) and GFP‐Nup49 (red) upon temperature upshift from 30°C to 37°C. * indicates collision of peripheral foci leading to fusion, and an arrow indicates apparent encounters of peripheral foci and nuclear INQ, followed by foci separation.
Figure 2A-D Cryo‐sections of (A) S. cerevisiae wt cells expressing GFP‐luciferase‐DM‐NLS, (B) hsp42Δ cells expressing GFP‐VHL. Sections were immunogold‐labeled with GFP‐specific antibodies. Gold particles are marked (black arrows). Electron‐dense regions represent protein aggregates (A). Locations of cytosol (C), nuclear envelope (NE, orange arrows), and nucleus (N) are given. Scale bars, 200 nm.E, F Average numbers of gold particles associated with nuclear and cytosolic protein aggregates or distributed throughout the cytosol or nucleus were determined.A-D Cryo‐sections of S. cerevisiae (C, D) wt or hsp42Δ cells expressing Hsp104‐GFP. Sections were immunogold‐labeled with GFP‐specific antibodies. Gold particles are marked (black arrows). Electron‐dense regions represent protein aggregates (A). Locations of cytosol (C), nuclear envelope (NE, orange arrows), and nucleus (N) are given. Scale bars, 200 nm.E, F Average numbers of gold particles associated with nuclear and cytosolicprotein aggregates or distributed throughout the cytosol or nucleus were determined.
Figure 3A S. cerevisiae wt cells expressing GFP‐VHL (green) were grown at 30°C and shifted to 37°C for 90 min in the presence of MG132. Ubiquitin (red) was stained by immunofluorescence microscopy using specific antibodies. DNA was stained by DAPI (blue). Changes in protein localizations were recorded. Scale bars, 2 μm.B tGnd1‐GFP is stabilized in ubr1Δ san1Δ cells. S. cerevisiae wt and ubr1Δ san1Δ mutant cells expressing tGnd1‐GFP were grown at 30°C. Cycloheximide was added, and protein levels were determined at the indicated time points by Western blot using GFP‐specific antibodies. Zwf1 levels are given as a loading control.C Ubiquitination status of tGnd1‐GFP expressed in S. cerevisiae wt and ubr1Δ san1Δ cells was determined by GFPpull‐down and Western blot analysis using ubiquitin‐specific antibodies. Levels of isolated tGnd1‐GFP after GFPpull‐down were determined by Western blot using GFP‐specific antibodies and are given as a control.D S. cerevisisae wt, ubr1Δ san1Δ, and ubr1Δ san1Δ btn2Δ cells expressing tGnd1‐GFP (green) were grown at 30°C. DNA and nuclear envelopes were visualized by coexpressing Htb1‐mCherry or Nic96‐mCherry, respectively (red). The fraction of cells showing specific tGnd1‐GFP foci numbers per cell was determined. INQ formation in cells containing tGnd1‐GFP foci was determined (% cells with INQ) based on close vicinity of tGnd1‐GFP foci to Htb1‐mCherry or localization inside Nic96‐mCherry signals, yielding comparable results. Scale bars, 2 μm.
Figure 4A, B S. cerevisiae hsp42Δ and hsp42Δ nup42Δ cells expressing mCherry‐VHL (red) were grown at 30°C and shifted to 37°C in the presence of MG132. Changes in protein localization were monitored. Scale bars, 2 μm. The total number of mCherry‐VHL foci per cell was determined.C Dynamic exchange of a misfolded model protein between cytosol and nucleus. FLIP measurements of mCherry‐VHL were performed in S. cerevisiae wild‐type cells at 30°C. Nuclear or cytosolic areas were bleached, and loss of fluorescence intensities in non‐bleached compartments was determined. Bleaching and acquisition controls are given. Error bars: SEM.
Figure 5S. cerevisiae hsp42Δ and hsp42Δ tet‐off sis1 cells expressing GFP‐VHL were grown for 20 h in the absence (−Dox) or presence (+Dox) of doxycycline at 30°C and shifted for 90 min to 37°C in the presence of MG132. Changes in protein localization were monitored. DNA was stained by DAPI (blue). The total number of GFP‐VHL foci per cell and frequencies (%) of INQ formation were determined. Scale bars, 2 μm.B S. cerevisiae wt, hsp42Δ, sti1Δ, and hsp42Δ sti1Δ cells expressing GFP‐VHL were grown at 30°C and shifted to 37°C in the presence of MG132. Changes in protein localization were monitored. The total number of GFP‐VHL foci per cell and frequencies (%) of INQ formation were determined. Scale bars, 2 μm.
Figure 6A, B S. cerevisiae wt, hsp42Δ, btn2Δ, and hsp42Δ btn2Δ cells expressing GFP‐VHL (green, A) or GFP‐luciferase‐DM‐NLS (green, B) were grown at 30°C and shifted to 37°C for 90 min in the presence of MG132, and protein localizations were recorded. DNA was stained by DAPI (blue), and the nuclear envelope was stained by Nsp1immunofluorescence microscopy (red). Solubilities of GFP‐VHL and GFP‐luciferase‐DM‐NLS were determined after stress application by Western blot using GFP‐specific antibodies. Solubility of actin was determined as a control. T, total fraction; S, soluble fraction; P, pellet fraction. Scale bars, 2 μm.C S. cerevisiae wt, hsp42Δ, btn2Δ, and hsp42Δ btn2Δ cells expressing mCherry‐VHL were heat‐shocked to 38°C. Upon return to 30°C, protein synthesis was stopped by cycloheximide (CHX) addition and degradation of mCherry‐VHL was monitored by Western blot analysis. The stability of GFP‐luciferase‐DM‐NLS expressed in S. cerevisiae wt and btn2Δ cells was determined accordingly. Ccs1 or Zwf1 levels are given as loading controls.D S. cerevisiae hsp42Δ btn2Δ cells expressing either GFP or LuciDM‐GFP and Htb1‐mCherry were grown at 30°C and heat‐shocked to 37°C for 30 min. Line intensity plots of luciferase‐DM‐GFP and Htb1‐mCherry before and after heat shock are given. The ratio of nuclear and cytosolic luciferase‐DM‐GFP fluorescence intensity was determined at 30°C and 37°C (n > 25). Scale bars, 2 μm.
Figure 7A, B Cellular localizations of Hsp42 and Btn2 were determined at the indicated temperature by immunofluorescence microscopy. DNA was stained by either Htb1‐mCherry or DAPI. Scale bars, 2 μm. In case of Hsp42 immunofluorescence, a line intensity plot of a deconvoluted widefield image is given.C S. cerevisiae btn2Δ hsp42Δ Hsp42‐NLS cells expressing GFP‐VHL (green) were grown at 30°C and heat‐shocked to 37°C for 30 min in the presence of MG132. Changes in protein localizations were recorded. DNA was stained by DAPI (blue). The total number of GFP‐VHL foci per cell and frequencies (%) of INQ formation were determined. Scale bars, 2 μm.D S. cerevisiaebtn2Δ hsp42Δ Hsp42‐NLS cells expressing mCherry‐VHL (red) were treated as described in (C). The nuclear membrane was visualized by Nsp1 immunofluorescence (green) and colocalization of mCherry‐VHL foci with Hsp42 was probed by Hsp42 (green) immunofluorescence microscopy. DNA was stained with DAPI (blue). Scale bars, 2 μm.E Hsp42 and Btn2 levels were determined prior and post‐heat shock at the indicated time points by Western blot. The numbers of molecules/cell were calculated using purified proteins as standard.
Figure 8A S. cerevisiae wt cells were treated with MMS and Btn2 levels were determined at the indicated time points. Zwf1 levels are given as a loading control.B, C S. cerevisiae wt and btn2Δ cells expressing Hos2‐GFP (green, B) or GFP‐VHL (green, C) were grown at 30°C and treated with MMS. Changes in protein localizations were recorded at the indicated time points. DNA was stained by DAPI (blue). The total number of GFP‐VHL foci per cell and frequencies (%) of INQ formation were determined.
Figure 1(a) RT-PCR expression and quantification of IGF1, IGF1Rβ and IGF2 levels in untreated C2C12 and shCD20 C2C12 myoblasts and 10 nM IGF1-treated C2C12 and over-expressing CD20 C2C12 myoblasts. Each experiment was replicated independently four times.(b) Immunofluorescence for IGF2 (in green) in untreated and 10 nM IGF1-treated C2C12 myoblasts. Scale bars = 75 μm.Representative CD20 immunoprecipitation using anti-pSer+pThr in (c) C2C12 cells treated with IGF1 for two hours (2 h) or overnight (ON) as indicated. Densitometric analysis of data are expressed as the ratio of CD20/vinculin or pSer+pThr/CD20 and are shown normalized to vinculin in arbitrary units in the lower panels shown Two-way ANOVA. *p<0.05; **p<0.01; ****p<0.0001. Each experiment was performed in triplicate wells. All values are expressed as the mean ± SEM.Representative CD20 immunoprecipitation using anti-pSer+pThr in (d) sh-empty (shCTR)- and shCD20-treated C2C12 cells treated with anti-Flag and 10 nM anti-IGF2R, as indicated. Densitometric analysis of data are expressed as the ratio of CD20/vinculin or pSer+pThr/CD20 and are shown normalized to vinculin in arbitrary units in the lower panels shown Two-way ANOVA. *p<0.05; **p<0.01; ****p<0.0001. Each experiment was performed in triplicate wells. All values are expressed as the mean ± SEM.Representative CD20 immunoprecipitation using anti-pSer+pThr in (e) C2C12 cells treated with IGF1 and IGF2, as indicated. Densitometric analysis of data are expressed as the ratio of CD20/vinculin or pSer+pThr/CD20 and are shown normalized to vinculin in arbitrary units in the lower panels shown Two-way ANOVA. *p<0.05; **p<0.01; ****p<0.0001. Each experiment was performed in triplicate wells. All values are expressed as the mean ± SEM.(f) Representative WB of IGF2R and phosphorylated IGF2R (pIGF2R) in untreated, shCD20-treated and anti-IGF2R-treated C2C12 cells. Densitometric analysis of data are expressed as the ratio of IGF2R/actin or pIGF2R/IGF2R in arbitrary units in the lower panels. One-way ANOVA. *p<0.05; Each experiment was performed in triplicate wells. All values are expressed as the mean ± SEM.(g) IGF2R immunoprecipitation products were immunoblotted for Gαi2 and WB expression of IGF2R in untreated, IGF2-treated, anti-IGF2R-treated and IGF2+anti-IGF2R treated C2C12 cells. Densitometric analysis of data are expressed as the ratio of Gαi2/IGF2R in arbitrary units in the lower panel.(h) Representative WB of IGF1Rβ and IGF1Rβ immunoprecipitation products immunoblotted for p-Tyr in untreated, IGF2-treated and IGF2+anti-IGF2R-treated (1:500, 1:1000 and 1:2000 dilutions of anti-IGF2R) C2C12 cells (cells were treated for 2 and 24 h). Densitometric analysis of data are expressed as the ratio of pTYR/IGF1Rβ in arbitrary units in the lower panel. Each experiment was performed in triplicate wells. All values are expressed as the mean±SEM.
Figure 2(d) Over-expressing CD20 in C2C12 myoblasts that co-expressed CD20 (in green) and IGF2R (in red). DAPI-labelled nuclei are shown in blue. Scale bars=75 μm.(e) Representative CD20 and IGF2R immunoprecipitation products immunoblotted for IGF2R and CD20, respectively, in UNTREATED and shCD20-treated C2C12 cell membranes and whole lysates of proteins. The immunoprecipitation output is shown as IP neg.(f) Myotubes immunofluorescence of cells in proliferation medium (P.M.) and after 2, 4 and 6 days of myogenic differentiation in serum free medium. Control (untreated), shCD20-treated C2C12 cells, C2C12 and HSkM myoblasts pre-treated with anti-IGF2R for 24 hours were stained. Desmin-positive myotubes are shown in green. Scale bars=75 μm.(g) Fusion index quantification after 6 days of differentiation. One-way ANOVA. **p<0.01; ***p<0.001; ****p<0.0001. Each experiment was performed in triplicate wells. All values are expressed as mean±SEM.(h) Representative WB of anti-myogenin, anti-Myf5, anti-MyHC and anti-β-actin in total protein lysates obtained from untreated, shCD20-treated C2C12 cells, and C2C12 and HSkM myoblasts pre-treated with anti-IGF2R for 24 hours; cells were collected under P.M. and after 2, 4 and 6 days of myogenic differentiation. Densitometric analysis of WB data expressed as the ratio of the indicated antibody/β-actin in arbitrary units. Two-way ANOVA test. *p<0.05; **p<0.01; ***p<0.001; ****p<0.0001 in comparison to the results obtained in untreated cells at the corresponding time point. ##p<0.01; ###p<0.001; ####p<0.0001 in comparison to the results obtained in shCD20-treated C2C12 cells at the corresponding time point. Each experiment was performed in triplicate wells. All values are expressed as the mean±SEM.
Figure 3Immunofluorescence analysis of CD20 and IGF2R expression (in red) in the TA muscles of three-month-old C57Bl6/J and mdx mice. Scale bars=75μm. (a).IGF2R (green) and sarcomeric actin (magenta) expression in the VM muscles of two DMD patients. Scale bars=25μm. (b).Representative WB analysis of CD20 and β-actin (c) expression in the TA and VM muscles of C57Bl6/J and mdx mice (n=10 mice per group). Densitometry analysis of WB data are expressed as the CD20/β-actin ratio, in arbitrary units in the lower panels One-way ANOVA. ****p<0.0001.Representative WB analysis of pSer+pThr and GADPH (d) expression in the TA and VM muscles of C57Bl6/J and mdx mice (n=10 mice per group). Densitometry analysis of WB data are expressed as the pSer+pThr/CD20 ratio in arbitrary units in the lower panels One-way ANOVA. ****p<0.0001.(e) Representative WB analysis of IGF2R and GAPDH expression in total protein lysates of the human (healthy and DMD) and murine (C57Bl6/J and mdx) TA and VM muscles (n=2 per healthy and DMD; n=10 mice per group); quantifications are expressed as the IGF2R/GAPDH ratio in arbitrary units.(f) Representative WB analysis of IGF2R expression in sarcolemma protein lysates of the TA and VM muscles of healthy, DMD, C57Bl6/J and mdx (n=2 per healthy and DMD; n=10 mice per group). Densitometry analysis of IGF2R expression, results are shown as a fold increase, as indicated in the lower panel in arbitrary units. One-way ANOVA. *p<0.05; ****p<0.0001. All values are expressed as the mean±SEM.