EMBO/SourceData huggingface dataset:
Figure 9A-C GFPimmunofluorescence microscopy staining of small intestine from 2‐month‐old LGR5‐GFPki, APC+/+ mice and LGR5‐GFPki, APCmin/+mice. (A) Quantification of GFP staining intensity of cells at indicated positions in basal crypts (n = 3 mice per group, 50 positively stained cells were measured per mouse). Note the GFP staining intensity was increased in APCmin/+ mice, particularly in position 4 and 5 cells. (B, C) Representative pictures are given. Dashed lines outline the crypts. Arrowheads and numbers indicate cell positions in the crypts. Scale bar: 20 μm.D-F Two‐month‐old APC+/+ mice and APCmin/+ mice were exposed to 6 Gy γ‐irradiation. Small intestinal tissue was collected at 24 h after IR (n = 3 mice per group). (D) Quantification of PCNA+ ISPCs at the indicated positions in basal crypts 24 h after IR. IR, irradiated. (E, F) Representative pictures of PCNA staining are given. Arrowheads and numbers indicate cell positions in the crypts. Scale bar: 20 μm.G-K Two‐month‐old LGR5‐GFPki, APC+/+ mice and LGR5‐GFPki, APCmin/+ mice were exposed to 6 Gy γ‐irradiation. Small intestinal tissue was collected at 24 h after IR (n = 4 mice per group). (G) Flow cytometry analysis of the number of LGR5+ ISPCs of irradiated mice compared to the number in non‐irradiated mice (NIR) set to 100%. (H-K) Representative FACS plots of indicated groups are given.
Figure 1B Dose response curves for viability of parental cells (in red) or selected clones (in black) upon treatment with NFR for 48h. The green dashed box highlight concentration in the physiologically relevant range. Curves are mean ± s.e.m. of 3 independent experiments performed in triplicate. P values were calculated using 2way ANOVA analysis of variance between parental cells and each individual clone. Bar graph represents the EC50 (half maximal effective concentration) of the dose responses. Data are mean ± s.e.m. of 3 independent experiments performed in triplicate. P values were calculated using 1way ANOVA analysis of variance (P value in red) followed by Dunnett's multiple comparison tests. *P value ≤ 0.05, ** P value ≤ 0.01.C The parental population and the NFR resistant clones were analyzed for eEF2K mRNA expression by real-time PCR relative to β-actin (mean and s.e.m. from 3 independent batches of cells are shown). P values were calculated using 1way ANOVA analysis of variance followed by Dunnett's multiple comparison tests. *P value ≤ 0.05, ** P value ≤ 0.01, *** P value ≤ 0.001.D The parental population and representative NFR resistant clones were analyzed by WB for eFF2K total protein level. Tubulin is used as loading control. Histogram represents mean and s.e.m of relative eEF2K level quantified from WB of 4 different batches of cells collected at different dates (see also source data). P values were calculated using 1way ANOVA analysis of variance followed by Dunnett's multiple comparison tests. *** P value ≤ 0.001.
Figure 2A Immunoblot analysis of eEF2 Thr56 phosphorylation (P-eEF2) in HeLa cells treated for 6h with increasing doses of NFR, and compared with 10 μg/ml tunicamycin (TM), 200 nM rapamycin (Rapa.) or 1h starvation (Starv.). Tubulin is used as loading control.B eEF2K WT and KO MEF treated for 6h with indicated concentration of NFR, 200 nM rapamycin (Rapa.), 1h starvation (Starv.) or 1 mM of the AMPK activator AICAR, were analyzed by immunoblot with antibodies directed against total or phosphorylated eEF2 (Thr56).C Three representative NFR-resistant HeLa clones were analyzed by Immunoblot for eEF2K expression level and eEF2 phosphorylation upon NFR and compared to parental HeLa cells. For treatments, medium was replaced for 6h with medium containing DMSO (Mock), increasing doses of NFR or 10 μg/ml tunicamycin (TM), or for 1h with PBS for starvation (Starv.). Tubulin is used as loading control.D Immunoblot analysis of eEF2 Thr56 phosphorylation in HeLa cells treated for 6h with increasing doses of different HIV-PIs as indicated or the NFR metabolite M8 (hydroxy-tert-butylamide). Molecular structures of the different HIV-PIs used are indicated. Each panel is representative of at least 3 independent experiments.
Figure 3B eEF2K WT and KO MEF treated for 6h with indicated concentration of NFR, Rapamycin (Rapa), AICAR or starved for indicated time in PBS (Starv.), were analyzed by immunoblot using indicated antibodies. Tubulin is used as loading control.C A potent mTOR inhibition does not impair NFR-mediated eEF2 phosphorylation. WT MEFs were treated with the indicated concentrations of Rapamycin or with vehicle (Mock). After 30 minutes, indicated doses of NFR were added and cells were incubated for additional 6h and analyzed for phosphorylated S6R and eEF2. Tubulin is used as loading control.D NFR-mediated eEF2 phosphorylation is not affected in AMPKα1α2 dKO. AMPKα1α2 WT and dKO MEF treated for 6h with indicated concentration of NFR, Rapamycin (Rapa), AICAR or starved for 1h in PBS (Starv.), were analyzed by immuoblot with indicated antibodies. * anti-total AMPKα antibody give an unspecific band with a slightly higher molecular weight in dKO cells. Tubulin is used as loading control. Each panel is representative of at least 3 independent experiments.
Figure 4A-B EEF2K contributes to the decreased translation observed with NFR without impacting translation in presence of TM. A. Quantification of newly synthesized proteins at 0, 2, 4 and 6h after 20 μM NFR (left panels) or 10 μg/ml TM (right panels) treatment in MEF eEF2K +/+ and eEF2K-/-. Treated cells were labeled for 15 minutes with 35S-methionine and visualized by SDS PAGE and subsequent autoradiography. Autoradiographies from four different experiments (see also source data) were quantified and results show percentage of translation compared to untreated cells. The mean and s.e.m of four independent metabolic labeling experiments are shown. *P value ≤ 0.05, ** P value ≤ 0.01, *** P value ≤ 0.001 obtained using 2way ANOVA analysis of variance (in red) followed by Bonferroni posttest (in black). B. eEF2K+/+, eEF2K-/-, eIF2αWT and eIF2αS51A MEFs were treated for 6h with indicated doses of NFR, 200 nM rapamycin, or 10 μg/ml TM, or for 30 min with 10 μg/ml CHX. 35S-methionine incorporation was measured by liquid scintillation counting. Data are shown as the percentage of translation compared to untreated cells. *P value ≤ 0.05, ** P value ≤ 0.01, *** P value ≤ 0.001 obtained using 2way ANOVA analysis of variance followed by Bonferroni posttest.C Representative polysome profiles of eEF2K WT and KO MEF treated 6h with NFR or TM. Area under curve for Sub-polysomes (S) and Polysomes (P) used to calculate the P/S ratio were indicated (see also raw data provided). Bar graph represents ratio normalized to untreated cells. OD254 nm is optical density at 254 nm. Data showed mean ±s.e.m. of P/S ratio calculated from 3 independent experiments. P values were calculated using 1way ANOVA analysis of variance followed by Bonferroni posttest; *P value ≤ 0.05, ** P value ≤ 0.01.D The ribosome half-transit time in MEFs eEF2K+/+ and eEF2K-/- was determined as described in Materials and Methods. Incorporation of 35S-Methionine into total protein within the PMS and PRS was obtained by linear regression analysis. Presented graphs are representative of two (CHX 1 μg/ml for 30 min and Starvation 30 min in PBS in eEF2K+/+ cells) to four (NFR 20μM for 6h in eEF2K+/+ and eEF2K-/- cells) independent experiments. Indicated values represent the x displacement measurement (in time) between the PMS line at 300sec and the PRS line (see also raw data provided). Histogram represents mean and s.e.m. of the ribosome half transit time from four independent experiments. P values were calculated using two tails unpaired Student's T-tests; *P value ≤ 0.05.
Figure 5A MEF eEF2K WT, KO or KO reconstituted with human eEF2K (Flag-eEF2K) were analyzed for cell growth at indicated times. Fold change (means ± s.e.m of triplicate) of the cell number just before treatment are shown. Histogram shows percentage of growth inhibition after 72h of 10 μM NFR. P values are 1way ANOVA with Bonferroni posttest calculated from 3 independent experiments. *** P value ≤ 0.001.B-F Dose response curves for cell viability after 48h NFR measured using MTS assay. Curves and bar graph for EC50 are mean ± s.e.m. of 3 independent experiments performed in triplicate. For curves, p values are 2way ANOVA analysis of variance. For bar graph, p values are two tails unpaired Student's T-tests (B, E), or 1way ANOVA with Bonferroni (C) or Dunnett's multiple comparison posttests (D and F). *P value ≤ 0.05, ** P value ≤ 0.01, *** P value ≤ 0.001. (B,C) eEF2K -/- MEFs show a decrease susceptibly to NFR compared to eEF2K +/+ controls (B) whereas eEF2K reconstitution restores NFR sensitivity (C).B-F Dose response curves for cell viability after 48h NFR measured using MTS assay. Curves and bar graph for EC50 are mean ± s.e.m. of 3 independent experiments performed in triplicate. For curves, p values are 2way ANOVA analysis of variance. For bar graph, p values are two tails unpaired Student's T-tests (B, E), or 1way ANOVA with Bonferroni (C) or Dunnett's multiple comparison posttests (D and F). *P value ≤ 0.05, ** P value ≤ 0.01, *** P value ≤ 0.001. (D-F), HeLa (D), A549 (E) and MCF7 (F) clones with CRISPR-Cas9 generated eEF2K deficiency (CrEEF2K) show a decrease susceptibly to NFR compare to control cells (CrLuci).G NFR-mediated toxicity assessed using AnnexinV/PI staining and FACS analysis after 24h treatment. Histogram shows the percentage of dead cells (AV+/PI+). Data are mean ± s.e.m. of 3 independent experiments. P values are 2way ANOVA with Bonferroni posttest. *P value ≤ 0.05, ** P value ≤ 0.01, *** P value ≤ 0.001.
Figure 6A Tumor volumes of eEF2K -/- and eEF2K +/+ RasV12 engraft implanted subcutaneously in AGR129mice. Treatment with NFR or vehicle was initiated 6 days post-implantation. Data are mean of tumor volume ± s.e.m. (n = 8 per group). P values were calculated using 2way ANOVA followed by Bonferroni posttest comparing WT tumor with vehicle or NFR treatment and KO tumors with vehicle or NFR treatment; *P value ≤ 0.05, ** P value ≤ 0.01, *** P value ≤ 0.001. Experiment is representative of 2 performed in same conditions.B Immunoblots for total and phosphorylated eEF2 of tumor engraftment from (A). (NS, Non-Specific signal.)C Bar graph shows relative phosphorylation intensities of eEF2 compared with total eEF2 determined by densitometry analysis. Mean ± s.e.m. are shown (n=4). P values were calculated using 2way ANOVA followed by Bonferroni posttest ; **P value ≤ 0.01.
Figure 1(A) Immunoblot analysis. Primary hepatocytes prepared from wild-type mice were infected with adenovirus expressing GFP or NBR1 under the CAG promoter for 48 hrs. Cell lysates were prepared and subjected to immunoblot analysis with the indicated antibodies. Data shown are representative of three separate experiments. Bar graphs indicate the quantitative densitometric analysis of the indicated proteins relative to actin. Data are shown as means ± s.e. *P < 0.05 as determined by Welch's t-test.(B) Real-time PCR. Total RNAs were prepared from primary hepatocytes described in (A). Values were normalized against the amount of mRNA in the hepatocytes expressing GFP. The experiments were performed three times. Data are shown as means ± s.e. *P < 0.05 as determined by Welch's t-test.(C) Immunofluorescence microscopy. Wild type hepatocytes were infected with LacZ or NBR1 adenovirus for 48 hrs and then immunostained with anti-p62 and anti-NBR1 antibodies. Each inset is a magnified image. Bars: 20 µm. The number and size of p62-bodies were measured in more than 100 cells. Data are shown as means ± s.e. ***P < 0.001 as determined by Welch's t-test.(D) FRAP assay. Wild type hepatocytes cultured in glass-bottom plates were infected with GFP-NBR1 adenovirus for 48 hrs. The signal recovery after photobleaching was measured, quantified from at least three independent biological replicates, and is represented as means ± s.e. Bar: 1 µm.
Figure 2(A) Immunoblot analysis. Primary hepatocytes prepared from wild-type mice were infected with adenovirus expressing GFP-Nrf2 and GFP or NBR1 for 48 hrs. Total cell lysates were prepared and subjected to immunoblot analysis with the indicated antibodies. Data shown are representative of three separate experiments. Bar graphs indicate the quantitative densitometric analysis of the indicated proteins relative to actin. Data are shown as means ± s.e. **P < 0.01 as determined by Welch's t-test.(B) Immunoblot analysis. Primary hepatocytes prepared from p62f/f and p62f/f; Alb-Cre mice were infected with adenovirus against GFP or NBR1 for 48 hrs. Cytosolic and nuclear fractions were prepared and subjected to immunoblot analysis with the indicated antibodies. Data shown are representative of three separate experiments. Bar graphs indicate the quantitative densitometric analysis of the indicated proteins relative to actin (cytosolic proteins) or Lamin B (nuclear proteins). Data are shown as means ± s.e. *P < 0.05 as determined by Welch's t-test.(C) Immunofluorescence microscopy. Primary hepatocytes from wild type mice were infected with adenovirus expressing GFP-Nrf2 and LacZ or NBR1 for 48 hrs. More than 100 cells were assayed for the nuclear signal of Nrf2. Data are shown as means ± s.e. ***P < 0.001 as determined by Welch's t-test. Bars: 10 µm.(D) Total RNAs were prepared from primary hepatocytes described in (B). Values were normalized against the amount of mRNA in the p62f/f hepatocytes expressing GFP. The experiments were performed at least three times. Data are are shown as means ± s.e. *P < 0.05 as determined by Welch's t-test.
Figure 3(A) Immunofluorescence microscopy. Primary hepatocytes prepared from p62f/f mice were infected with or without adenovirus Cre recombinase for 48 hrs and then additionally infected with adenovirus LacZ or NBR1. 24 hrs after the infection, the hepatocytes were immunostained with anti-Keap1, anti-p62 and anti-NBR1 antibodies. Each inset is a magnified image. Bars: 10 µm.(B) Immunoprecipitation analysis. Crude extracts were prepared from primary hepatocytes as described in (A) and then immunoprecipitated with anti-FLAG (as a negative control) or anti-NBR1 antibody. The resulting samples were analyzed by immunoblot analysis. Data shown are representative of three separate experiments.(C) Primary hepatocytes prepared from p62f/f; Alb-Cre mice were co-infected with adenovirus GFP or NBR1 in combination with wild-type p62 or the mutants for 48 hrs. Cell lysates were prepared and subjected to immunoblot analysis with the indicated antibodies. Data shown are representative of three separate experiments. Bar graphs indicate the quantitative densitometric analysis of the indicated proteins relative to actin. Data are shown as means ± s.e. *P < 0.05, **P < 0.01, and ***P < 0.001 as determined by Welch's t-test.(D) RT qPCR analysis. Total RNAs were prepared from hepatocytes described in (C). Values were normalized against the amount of mRNA in the hepatocytes expressing GFP. The experiments were performed three times. Data are shown as means ± s.e. *P < 0.05, and **P < 0.01 as determined by Welch's t-test.
Figure 4(A) Immunoblot analysis. Primary hepatocytes prepared from Nrf2f/f and Nrf2f/f; Alb-Cre mice were infected with adenovirus expressing GFP or NBR1 for 48 hrs. Cytosolic and nuclear fractions were prepared and subjected to immunoblot analysis with the indicated antibodies. Data shown are representative of three separate experiments. Bar graphs indicate the quantitative densitometric analysis of the indicated proteins relative to actin (cytosolic proteins) or Lamin B (nuclear proteins). Data are shown as means ± s.e. *P < 0.05, and **P < 0.01 as determined by Welch's t-test.(B) Real-time PCR. Total RNAs were prepared from primary hepatocytes described in (A). Values were normalized against the amount of mRNA in the Nrf2f/f hepatocytes expressing GFP. The experiments were performed at least three times. Data are shown as means ± s.e. *P < 0.05 as determined by Welch's t-test.(C) Immunofluorescence microscopy. Hepatocytes isolated from Nrf2f/f and Nrf2f/f; Alb-Cre mice were infected with LacZ or NBR1 adenovirus for 48 hrs and then immunostained with anti-p62 and anti-NBR1 antibodies. Each inset is a magnified image. Bars: 20 µm. The number and size of p62-bodies were measured in more than 100 cells. Data are shown as means ± s.e. ***P < 0.001 as determined by Welch's t-test.
Figure 5(A) Immunoblot analysis. Primary hepatocytes prepared from wild-type mice were infected with the indicated adenovirus for 48 hrs and subsequently treated with 100 nM Bafilomycin A1 (BafA1) for 24 hrs or cultured in amino acid-deprived medium (Stv) for 12 hrs. Cell lysates were prepared and subjected to immunoblot analysis with the indicated antibodies. Data shown are representative of three separate experiments. Bar graphs show the quantitative densitometric analysis of the indicated proteins relative to actin. Data are shown as means ± s.e. *P < 0.05 as determined by Welch's t-test.(B) Fluorescence microscopy. p62-deficient MEFs were co-transfected with mCherry-GFP-p62 in combination with wild-type NBR1 or NBR1 D50R mutant. 48 hrs after the transfection, fluorescence images were observed. Bars: 10 µm. The number of puncta positive for only red-signal in each MEFs was counted in more than 100 cells. Bar graphs are represented as means ± s.e. ***P < 0.001 as determined by Welch's t-test.
Figure 6(A) Immunoblot analysis. Primary hepatocytes were isolated from wild-type (wt), p62f/f; Alb-Cre (p62KO) and Nrf2f/f; Alb-Cre (Nrf2KO) mice. The hepatocytes were challenged with 10 μM sodium arsenite [As (III)] for 12 hrs. Cell lysates were prepared and subjected to immunoblot analysis with anti-NBR1 and anti-Actin antibodies. Data shown are representative of three separate experiments. Bar graphs indicate the quantitative densitometric analysis of the indicated proteins relative to actin. Data are shown as means ± s.e. *P < 0.05, and **P < 0.01 as determined by Welch's t-test.(B) Real-time PCR. Total RNAs were prepared from primary hepatocytes described in (A). Values were normalized against the amount of mRNA in each non-treated hepatocytes. The experiments were performed three times. Data are shown as means ± s.e. **P < 0.01 and ***P < 0.001 as determined by Welch's t-test.(C) Immunofluorescence microscopy. Primary hepatocytes isolated from wild-type mice were challenged with 10 μM sodium arsenite [As (III)] for 12 hrs and then immunostained with anti-p62 and anti-NBR1 antibodies. Each inset is a magnified image. Bars: 20 µm. The number and size of p62-bodies were measured in more than 100 cells. Data are shown as means ± s.e. ***P < 0.001 as determined by Welch's t-test.
Figure 7A) Immunoblot analysis. Primary hepatocytes were isolated from Nbr1f/f mice and then infected with adenovirus GFP or Cre for 48 hrs. Thereafter, the hepatocytes were divided into 3 groups: 1. Cultured in regular medium (-), 2. Treated with 10 μM As (III) for 12 hr [As (III)] and 3. After treated with 10 μM As (III) for 12 hr, cultured in regular medium for another 12 hr (Wash). Cell lysates were prepared and subjected to immunoblot analysis with indicated antibodies. Data shown are representative of three separate experiments. Bar graphs indicate the quantitative densitometric analysis of the indicated proteins relative to actin. Data are shown as means ± s.e. *P < 0.05, **P < 0.01, and ***P < 0.001 as determined by Welch's t-test.B) Real-time PCR. Total RNAs were prepared from primary hepatocytes described in (A). Values were normalized against the amount of mRNA in the Nbr1f/f hepatocytes expressing GFP under normal culture conditions. The experiments were performed at least three times. Data are shown as means ± s.e. *P < 0.05 as determined by Welch's t-test.(C) Immunofluorescence microscopy. Nbr1f/f hepatocytes were infected with LacZ or Cre adenovirus for 48 hrs and, when indicated, challenged with 10 μM As (III) for 12 hrs. The cells were then immunostained with anti-p62 and anti-NBR1 antibodies. Each inset is a magnified image. Bars: 20 µm. The number and size of p62-bodies were measured in more than 100 cells. Data are shown as means ± s.e. **P < 0.01, and ***P < 0.001 as determined by Welch's t-test. (D) Role of NBR1 in the p62-liquid droplets and the p62-mediated Nrf2 activation. Oxidative stress up-regulates the level of NBR1, which enhances the phosphorylation and liquid-droplet formation of p62. The resulting p62-droplets are resistant to autophagic degradation and serve as signaling nodes for the activation of Nrf2. Since p62 is one of the targets of Nrf2, increased level of p62 in cooperation with NBR1 promote the formation of liquid droplets and contributes to the persistent activation of Nrf2 against oxidative stress.
Figure 1(B) Genotyping of Brd4fl/fl mice with ERT2-Cre (Cre) or without ERT2 -Cre (+/+). Tamoxifen treatment deleted 2.2 kb Brd4fl/fl fragment from Cre/+ and Cre/Cre mice (top). Cre/+, Cre/Cre and +/+ mice were confirmed by the presence of ERT2 -Cre band (Cre), or its absence (WT) (bottom).(C) WT and Brd4 KO cells were tested for mRNA (left) and the protein (right) by qRT-PCR and immune blot assays. Values represent the average of three experiments +/- SD.(D) Vav-cre mediated Brd4 depletion was verified for cells from Brd4fl/fl Vav-Cre mice (fetal liver or spleen) by qRT-PCR and Immunoblot (left and right). Values represent the average of three experiments +/- SD.(E) Photographic images of E14.5 embryos from WT and KO mice.(F) Corresponding Flow cytometric profile of Lin- fetal liver cells stained with C-Kit and Sca-1 antibodies examining early hematopoietic progenitor population (LSK) (left). LSK populations were further divided by the Flt3 marker to detect HSCs and MPPs (middle). The number of total cells, that of LSKs, HSCs, MPPs in a fetal liver were estimated on indicated days of embryonic development (E13.5, E14.5 and E17.5). Values are the average of 3-5 embryos +/- S.D (right).(H) Representative flow cytometric profile of CD71- cells stained for the myeloid and lymphoid markers. Values are the average of 3 E17.5 embryos +/- S.D.
Figure 2(A) Flow cytometry profiles of peritoneal cells from WT and KO mice stained for CD19 and F4/80 (left). FACS profile of CD19- subset showing CD11b+ and F4/80+ subsets of cells from WT and KO macrophage populations (middle). Cell numbers (right) represent the average of 4 WT and 4 Brd4 KO mice +/- S.D. Note a reduction in F4/80+ cells from Brd4 KO peritoneum.(B) Flow cytometry profiles of peritoneal cells from IL-4C injected WT and KO mice (left). Cell numbers (right) represent the average of 4 WT and 4 Brd4 KO mice +/- S.D.(C) Flow cytometry profiles of BrdU incorporation and Ki67, ARG1 expression in peritoneal cells (gated for F4/80+, CD19- macrophages) from IL-4C treated WT and KO mice (left). The numbers of cells positive for BrdU, Ki67 and ARG1 (right). The numbers represent the average of three experiments +/- S.D.(D) Microarray analysis of macrophage gene expression in IL-4C treated WT or Brd4 KO mice. Macrophages were isolated from peritoneal cells by the MACS system. Differentially expressed genes were identified with a cut-off line of log 2fold change >2 difference with p value of < 0.05. Red dots indicate differentially expressed genes (KO vs WT) and gray dots are those below the cut-off line.(F) qRT-PCR confirmation of representative genes downregulated in KO macrophages from IL-4C treated mice. Values represent the average of three independent experiments +/- S.D.