EMBO/soda-nel huggingface dataset:
Calpain-mediated cleavage of Atg5 switches autophagy to apoptosis (2006)
figf4

(a) HeLa cells were transiently transfected with 24K and 33K Atg5 for 24 h and subsequently analysed by Hoechst staining. Values are means ± s.e.m. of three independent experiments. Bax transfection was used as a positive control. (b) Representative images after Hoechst staining demonstrating nuclear fragmentation of HeLa cells that were transfected with 24K Atg5 using lentiviral gene transfer for 24 h. Quantitative analysis of these experiments is shown in a. Control and transfected cells were loaded with Mitotracker orange and subsequently processed for cytochrome c immunostaining. Enforced expression of 24K Atg5 resulted in cytochrome c release into the cytosol and apoptosis (nuclear condensation, cell shrinkage; approximately 80% of the cells). (c) Jurkat cells were transfected with 24K and 33K Atg5 using lentiviral gene transfer. Cell death was observed as a consequence of enforced expression of truncated Atg5 within two days. Morphological analysis (Diff-Quik) is also shown and revealed that the type of death was apoptosis (nuclear condensation, cell shrinkage). (d) CEM cells that either lacked Bcl-2 or expressed high levels of Bcl-2 received truncated Atg5 or GFP by lentiviral gene transfer. In the absence of Bcl-2, induction of apoptosis as assessed by DNA fragmentation was observed due to enforced expression of truncated Atg5 within two days. Apoptosis was largely blocked in cells expressing high levels of Bcl-2. GFP transfection did not affect viability of the cells in this system. (e) Staurosporine-induced Atg5 cleavage (5 h treatment) in CEM cells independent of Bcl-2 expression. Blots were stripped and reprobed with anti-GAPDH antibody. (f) Detection of autophagic activity by staining of acidic vesicular organelles (VAOs, red) followed by flow cytometric analysis in genetically modified HeLa cells. That 24K Atg5 did not induce autophagy was confirmed by transmission electron microscopy (data not shown). (g) Cell death after 24K Atg5 gene transfer in HeLa cells exhibiting different autophagic activities. Values are means ± s.e.m. of three independent experiments (lentiviral gene transfer for 24 h). The asterisks indicate P 0.05. n.s., no significant difference. The scale bars represent 10 μM.
Calpain-mediated cleavage of Atg5 switches autophagy to apoptosis (2006)
figf5

(a) Confocal microscopy of HeLa cells were treated with anti-CD95 antibody for 5 h or left untreated. Cells were stained with anti-Atg5 and anti-VDAC antibodies. In untreated cells, there was only little evidence for colocalization of Atg5 and VDAC. In anti-CD95 antibody treated cells some of the Atg5 colocalized with VDAC. The images of colocalization were prepared using Imaris software. Numerical analysis was performed on 10 cells in each group and the correlation coefficient calculated. The error bars represent the s.e.m. (b) Subcellular fractionation of blood neutrophils that were left untreated to induce spontaneous apoptosis. After 4 h incubation, cleavage of Atg5 was evident and both full-length and truncated A tg5 were present in the cytosol. After 8 h incubation, some 24K Atg5 but not full-length Atg5 was found in the mitochondrial fraction. Mitochondrial association of truncated Atg5 coincided with the release of cytochrome c into the cytosol. The same data were observed in staurosporine-induced apoptosis of Jurkat cells (data not shown). C, cytosol; M, mitochondria. (c) Cytochrome c release assay. Truncated and full-length recombinant Atg5 were added to isolated mitochondria and incubated at 37 °C for 1 h. Supernatants and mitochondrial pellets were then analysed for cytochrome c by immunoblotting. Truncated Bid (tBid) was used as a positive control for mitochondrial permeabilization. Truncated Atg5 released cytochrome c in a concentration-dependent manner, indicating mitochondrial permeabilization. Full-length Atg5 had only little effect in this system. (d) HeLa cells were transfected with 24K and 33K Atg5 using lentiviral gene transfer for 24 h and analysed for caspase-3 cleavage. GAPDH expression demonstrates equal loading. (e) Jurkat cells were treated with staurosporine for 5 h or left untreated. Staurosporine induced Atg5 cleavage and both full-length and truncated Atg5 were present in total lysates. Truncated but not full-length Atg5 was detected in Bcl-xL immunoprecipitates obtained from apoptotic Jurkat cells. No evidence for physical interaction between Atg5 and Bax was obtained. The lower panels demonstrate that both Bax and Bcl-xL were enriched following immunoprecipitation. The asterisk indicates P 0.05. The scale bars represent 10 μM.
Aminopeptidase I is targeted to the vacuole by a nonclassical vesicular mechanism. (1997)
Figure 2

Precursor API is trapped in a prevacuolar compartment in vps18 cells. (A) Yeast strain JSR18Δ1 with plasmid pJSR9 (vps18 ts) was grown at the permissive temperature of 26°C. Before labeling, the cells were incubated at either 26° or 38°C for 10 min. Pulse labeling was for 5 min, followed by the indicated chase times. (B) vps18 spheroplasts were shifted to 38°C for 5 min, pulse labeled for 5 min, and then chased for either 0 or 60 min. At each time point the spheroplasts were collected by centrifugation and resuspended in PS0 buffer. The Total (T) fraction either received no treatment, was treated with 50 μg/ml proteinase K, or received proteinase K in the presence of 0.2% Triton X-100. The supernatant (S0) and pellet (P0) fractions were collected after centrifugation at 10,000 g for 5 min. (C) vps18 spheroplasts were pulse labeled for 10 min, chased for 10 min at 26°C, and then shifted to 38°C and chased for an additional 60 min. These cells were then lysed in PS200 buffer, and the S200 and P200 fractions were collected by centrifugation at 5,000 g for 5 min. The P200 fraction was resuspended in 10% Ficoll solution made in PS200, and vacuoles were isolated by flotation through 4% Ficoll. V, vacuole fraction; I, 4/10% Ficoll interface fraction; P, gradient pellet. Proteins of interest were recovered by immunoprecipitation, followed by SDS-PAGE, and detected by a Molecular Dynamics STORM phosphorimager. The positions of precursor and mature API and CPY are indicated.
Aminopeptidase I is targeted to the vacuole by a nonclassical vesicular mechanism. (1997)
Figure 3

A mutant in the API propeptide causes accumulation of prAPI on a nonvacuolar compartment. (A) Spheroplasts from an ape1Δ strain containing a plasmid bearing P22L API were subjected to differential lysis in PS200 buffer. The Total (T) fraction (after differential lysis) either received no treatment, was treated with 50 μg/ ml proteinase K, or received proteinase K in the presence of 0.2% Triton X-100. (B) The supernatant (S200) and pellet (P200) fractions were collected after centrifugation at 5,000 g for 5 min. The P200 fraction was resuspended in 10% Ficoll, and vacuoles were isolated by flotation through 4% Ficoll. V, vacuole; I, 4/10% Ficoll interface; P, gradient pellet. Proteins were detected by Western blotting. The positions of prAPI, mAPI, and mPrA are indicated. (C) ape1Δ cells containing P22L API on a plasmid were pulse labeled for 5 min, harvested by centrifugation, and subjected to a nonradioactive chase in either nitrogen-containing (SMD) or nitrogen starvation (SD-N) medium. Samples were collected at the times indicated and immunoprecipitated with API antiserum. The resulting SDS-PAGE gels were quantified using a Molecular Dynamics STORM phosphorimager.
Aminopeptidase I is targeted to the vacuole by a nonclassical vesicular mechanism. (1997)
Figure 1

API delivery is blocked at low temperatures. SEY6210 cells were pulse labeled for 5 min and chased for the times indicated. Identical experiments were performed at 10°, 14°, and 30°C. API was recovered by immunoprecipitation followed by SDS-PAGE and detected by a STORM phosphorimager (Molecular Dynamics, Sunnyvale, CA). The positions of prAPI and mAPI are indicated.
Aminopeptidase I is targeted to the vacuole by a nonclassical vesicular mechanism. (1997)
Figure 4

Precursor API is trapped within a vesicle in cvt17 mutants. (A) Precursor API is in a protease-protected compartment in cvt17 mutants. THY32 (cvt17) spheroplasts were subjected to differential lysis and protease treatment in PS200 buffer as in Fig 3. (B) Precursor API is not free in the vacuolar lumen in cvt17 mutants. Differential fractionation was continued by resuspending the P200 fraction in PS0 buffer and separating the supernatant (S0) and pellet (P0) fractions by centrifugation at 10,000 g. The S0 and P0 fractions were treated with proteinase K in the presence and absence of Triton X-100 as indicated. All fractions were precipitated with 10% TCA and resolved by SDS PAGE; proteins of interest were detected by Western blotting. The positions of prAPI, mAPI, and mPrA are indicated.
Aminopeptidase I is targeted to the vacuole by a nonclassical vesicular mechanism. (1997)
Figure 5

Precursor API is contained within subvacuolar vesicles in cvt17 mutants. (A) Isolated vacuoles (V) from cvt17 cells were lysed in PS0 buffer, loaded on top of an Optiprep step gradient, and centrifuged at 170,000 g for 60 min as described in Materials and Methods. Fractions VV, 0/1.06 interface; LD, 1.06 region; SV, 1.06/1.12 interface; HD, 1.12 region. (B) An aliquot of fractions VV and SV was treated with proteinase K either in the presence or absence of Triton X-100 as indicated. Because of the presence of protease inhibitors in the vesicle isolation procedure, an intermediate-sized API degradation product results from proteinase K treatment. The V fraction represents one-tenth of the load of the Optiprep gradient. Proteins were detected by Western blotting. The positions of prAPI and mALP are indicated.
Aminopeptidase I is targeted to the vacuole by a nonclassical vesicular mechanism. (1997)
Figure 6

Immuno-EM of cvt17 cells. Yeast strains SEY6210 (parental wild type) and THY32 (cvt17) were grown in YPD and prepared for microscopy as described in Materials and Methods. (A) Wild-type cells probed with antibody against mature API. (B) A cvt17 section showing a cytosolic vesicle containing prAPI probed with antibody against the API proregion. (C) A cvt17 section showing subvacuolar vesicles containing API probed with antibody against mature API. N, nucleus; V, vacuole; (arrows) API containing vesicles. Bars, 0.5 μm.
Aminopeptidase I is targeted to the vacuole by a nonclassical vesicular mechanism. (1997)
Figure 7

Characterization of API-containing vesicles. (A) Fractionations were performed as in Fig. 5. The total (T), vacuole (V), vacuolar vesicle (VV), and subvacuolar vesicle (SV) fractions are shown. Proteins were detected by immunoblotting as indicated in the figure. (B) SYPRO orange staining detected by fluorescent scanning mode on a Molecular Dynamics STORM phosphorimager. The relative mobility of the molecular mass standards are indicated on the left. Polypeptides enriched in the subvacuolar vesicles are indicated on the right.
Microtubules control nuclear shape and gene expression during early stages of hematopoietic differentiation (2020)
Figure 1

Figure 1. Nucleus morphologies of stem cells and progenitors

A) Left panel: experimental strategy. Hematopoietic stem cells (HSPC) and progenitors were characterized and isolated using specific sets of surface markers. All cells express CD34. Upon differentiation, progenitors start to express CD38 in contrast to HSPC (blue). Progenitors engaged in the myeloid (magenta) and lymphoid (green) pathways express respectively CD33 and CD19 markers. Right panel: FACS gating strategy to isolate HSPC (further referred as CD38- (blue box), and cells engaged in myeloid and lymphoid differentiation pathways (referred to as CD33+ [magenta box] and CD19+ [green box], respectively).

B) For each population, equatorial Z stacks of two representative nuclei are shown in the left panel (chromatin is shown in blue (DAPI staining) and nuclear envelop in white (Sun2 staining). Scale bar: 5 µm. The corresponding 3D reconstructions are presented in the right panel. Convex and non-convex surfaces are shown in blue and yellow, respectively.

C) Nucleus-invagination ratio is defined as the ratio of the non-convex area over the total nucleus surface area. Nuclei are larger and deformed in CD33+ (magenta, n=106) than CD38- and CD19+ cells (blue [n=120] and green [n=115], respectively; 3 independent experiments; Bars correspond to mean ± SD; ****: p<0.0001, Mann-Whitney test; n.s: non significant).
Microtubules control nuclear shape and gene expression during early stages of hematopoietic differentiation (2020)
Figure 2

Figure 2. Cytoskeletal organization of stem cells and myeloid progenitors

A) For each population (CD38- and CD33+ cells), Z stacks of two representative cells are shown in the left panel. Microtubules are shown in green, actin in magenta, centrosome in white and chromatin in blue. In the middle panel, inverted image the corresponding actin staining is shown. In the left panel, the corresponding 3D projection of microtubules is presented as inverted image. Scale bar 5 µm.

B) Microtubules are tightly associated with the nucleus. Z stacks of representative CD38- and CD33+ cells are shown. Microtubules are shown in green, nucleus envelope (Sun2 immuno-staining) in magenta and chromatin in blue. Scale bar 5 µm.

C) As schematized, centrosome-to-nucleus center distance (d) over nucleus center-to-nucleus convex envelope (R) ratio is calculated to extract relative position of the centrosome to the center. This parameter is significantly lower in myeloid progenitors (n=129) than in HSPC (n=200; 3 independent experiments; ****; p<0.0001. Mann-Whitney test) indicating that centrosome becomes internalized within an invaginated region upon differentiation.

D) p150 glued associates with the nuclear membrane of HSPC (CD38-) and myeloid progenitors (CD33+) cells. Z stacks of representative cells are shown. Image contrast has been inverted. Stainings show DAPI, Sun2 and p150 glued . Scale bar 5µm.

E) The dynein adaptor BicD2 associates with the nuclear membrane of HSPC (CD38-) and myeloid progenitors (CD33+) cells. Z stacks of representative cells are shown. Image contrast has been inverted. Stainings show DAPI and BicD2. Scale bar 5µm.
Microtubules control nuclear shape and gene expression during early stages of hematopoietic differentiation (2020)
Figure 4

Figure 4. Lamin B is removed from nuclear invaginations in myeloid progenitors.

A) Spatial distribution of lamin A/C in the nuclei of HSPC (CD38-), myeloid progenitors (CD33+) and lymphoid progenitors (CD19+). Inverted images of equatorial Z plane of DAPI and lamin A/C are shown. Scale bar: 5 μm.

B) Line scans of lamin A/C signal along nucleus contour of representative cells are presented for each cell population. The corresponding variations in lamin A/C intensity and nucleus curvature are plotted in blue and in red, respectively. Negative curvature values correspond to local nuclear invaginations. Red asterisk underlines local nucleus invaginations.

C) Dispersion of A/C signal along the nucleus periphery is similarly low in CD38- (n=17, 3 donors), CD33+ (n=61, 3 donors) and CD19+ (n=11, 3 donors) indicative of an homogenous distribution of the protein along the nuclear membrane. (Bars correspond to mean ± SD; n.s: non significant; Mann Whitney test).

D) Dispersion of lamin B signal along the nucleus periphery is similarly low in CD38- (n=131, 3 donors), and CD19+ (n=74, 3 donors) indicative of a homogenous distribution of the protein along the nuclear membrane. But is significantly increased in CD33+ (n=146, 3 donors). Bars correspond to mean ± SD; ****:p<0.0001; Mann Whitney test.

E-F-G) Spatial distribution of lamin B and local measurements of lamin B intensity and curvature of nuclear membrane in CD38- (E), CD33+ (F) and CD19+ (G) cells. Inverted images of the equatorial Z plane of DAPI (left panel) and lamin B (right panel) of a representative nucleus are shown for each population. Scale bar: 5 μm. The variations in lamin B signal intensity and curvature are plotted in blue in red, respectively. Asterisks indicate local invaginations of the nuclear membrane. In the bottom graphs, positive and negative curvatures are shown in grey and red, respectively. The absence of curvature (curvature =0) is highlighted as a dashed line. In CD33+ cells, negative curvature of the nuclear membrane are associated with low lamin B intensities.
Micropeptide CIP2A-BP encoded by LINC00665 inhibits triple negative breast cancer progression (2019)
Figure 1

Figure 1. LINC00665 encodes a novel micropeptide and is regulated by TGF-β at the translational level

(A) Ribosome occupancy map at the LINC00665 locus. MCF10A were either mock-treated or treated with TGF-β and Ribosome profiling on three biological replicates were shown.

(B) Relative levels of CIP2A-BP were determined by polysome profiling and qRT-PCR in MCF-10A and TNBC cells either mock treated or treated with TGF-β.

(C) Relative levels of LINC00665 were determined by qRT-PCR in MCF-10A and TNBC cells either mock treated or treated with TGF-β.

(D) Upper: putative ORFs in LINC00665. Lower: The ORFs were constructed into pcDNA3.1 vector and transfected to MCF-10A cells for 24h. The ORFs-His fusion proteins were determined by western blot with anti-His antibody.

(E) Diagram of the GFP fusion constructs. The start codon ATGGTG of the GFP (GFPwt) gene is mutated to ATTGTT (GFPmut). The start codon ATG of the LINC00665 ORF is mutated to ATT.

(F and G) The indicated constructs were transfected into MCF-10A cells for 24h, then the GFP fluorescence was detected using fluorescence microscope (F) and fusion protein levels were determined by western blot with anti-GFP and anti-CIP2A-BP antibodies respectively (G).

(H) Diagram of the His fusion constructs. The start codon ATG of the LINC00665 ORF is mutated to ATT.

(I, J, and K) The indicated constructs were stably expressed in MDA-MB-231 cells, micropeptide CIP2A-BP was immuno-stained using anti-His (I) and anti-CIP2A-BP antibodies (K) respectively; CIP2A-BP-His fusion protein levels were determined by western blotting with anti-His and CIP2A-BP antibodies (J).

(L) MCF-10A cells incubated in the absence or presence of puromycin (200μM) were fractionated on sucrose gradients, and distribution of CIP2A-BP transcripts was quantified by qPCR.

Data information: Data are representative of 3 independent experiments (B, C and L). Data were assessed by paired Student's t test (B and C) and are represented as mean ± SD. *P < 0.05; **P < 0.01. Scale bars: 10μm (F), 20μm (I and K).
Micropeptide CIP2A-BP encoded by LINC00665 inhibits triple negative breast cancer progression (2019)
Figure 2

Figure 2. Micropeptide CIP2A-BP is endogenously expressed and downregulation is associated with poor prognosis in TNBC patients

(A) Micropeptide CIP2A-BP was immune-stained with anti-CIP2A-BP antibody in MCF-10A and MDA-MB-231 cells either mock treated or treated with TGF-β.

(B) Micropeptide CIP2A-BP levels were determined by western blot with anti-CIP2A-BP antibody in MCF-10A and TNBC cells either mock treated or treated with TGF-β.

(C) MCF-10A cells were first transfected with anti-LINC00665 translation-blocking antisense oligo, then micropeptide CIP2A-BP was detected.

(D) Micropeptide CIP2A-BP levels were detected by western blot with anti-CIP2A-BP antibody in the indicated non-metastatic TNBC tissues (non-metastasis) and metastatic TNBC tissues (metastasis). Micropeptide CIP2A-BP expression in MCF-10A cells was used as the positive control.

(E and F) Kaplan-Meier overall survival curves for TNBC patients with high or low

micropeptide CIP2A-BP expression in Suzhou cohort (discovery set, n = 112) and Guangzhou cohort (validation set, n = 105).

Data information: Data are representative of 3 independent experiments. Survival differences were analyzed using the log-rank test (E and F). Scale bars: 10μm (A).
Micropeptide CIP2A-BP encoded by LINC00665 inhibits triple negative breast cancer progression (2019)
Figure 3

Figure 3. The micropeptide CIP2A-BP suppresses migration and invasion of Triple Negative Breast Cancer cells in vitro and in vivo

(A and B) Migration and invasion of TNBC cells transfected with LINC00665 ORF and control lentiviruses for 48h. Right panel is the quantification of TNBC cells that migrated through the membrane without the Matrigel (upper) and invaded through Matrigel-coated membrane (lower).

(C and D) Migration and invasion of wild-type and CIP2A-BP knockout TNBC cells and CIP2A-BP re-expressed Hs578TKO and MDA-MB-231KO cells. Right panel is the quantification of cells that migrated through the membrane without the Matrigel (upper) and invaded through Matrigel-coated membrane (lower).

(E) Wound-healing assay on Hs578T and MDA-MB-231 cells transfected with LINC00665 ORF expressing and control lentiviruses. The wound edges were photographed at the indicated time points after wounding. Right panel is the quantification of the relative wound healing area.

(F) Wild-type and CIP2A-BP knockout TNBC cells and CIP2A-BP re-expressed Hs578TKO and MDA-MB-231KO were seeded on cell culture inserts for wound-healing assay. The wound edges were photographed at the indicated time points after wounding. Right panel is the quantification of the relative wound healing area.

(G and H) Macroscopic and histological analysis of the lungs of nude mice injected with the indicated Hs578T (G) and MDA-MB-231 cells (H) (1.0×105-106 cells/mouse) via tail vein; lung metastatic nodules were visualized 8 weeks post-transplantation (5 mice per group). Right panel is the quantification of pulmonary metastases.

Data information: Data are representative of 3 independent experiments (A-H). Data were assessed by paired Student's t test (A-H) and are represented as mean ± SD. *P < 0.05; **P < 0.01; ***P < 0.001. Scale bars: 50μm (A-D), 200μm (E and F), 1000 μm (G and H).
Micropeptide CIP2A-BP encoded by LINC00665 inhibits triple negative breast cancer progression (2019)
Figure 4

Figure 4. TGF-β inhibits expression of micropeptide CIP2A-BP through 4E-BP1

(A) Immunoblotting analysis of expression of the indicated proteins in TNBC cells cultured with or without TGF-β.

(B) Design of initial primer sets for chromatin immunoprecipitation assay.

(C) Chromatin immunoprecipitation showing Smad4 occupancy at the 4E-BP1 locus in TNBC cells. Co-precipitated DNA was analyzed for amplicons A-E by qPCR. Values represent the enrichment of bound protein fractions relative to input.

(D and E) A diagram of luciferase reporter constructs with wildtype and mutant 4E-BP1 promoter.

(F and G) Luciferase reporter assay was performed in Hs578T (F) and MDA-MB-231 (G) cells following co-transfection with wildtype or mutant 4E-BP1 promoter fragment and Smad4 over-expressed, or knocked down and respective controls for 36h and treatment with TGF-β for 24h. The reporter constructs were expressing the luciferase gene under 4E-BP1 promoter segment or 4E-BP1 promoter deleted 0 to +200 region.

(H) Regulation of 4E-BP1 expression and binding to eIF4E by TGF-β. TNBC cells were treated with TGF-β and equal amounts of proteins were subjected to immunoprecipitation and/or examined by immunoblotting analysis.

(I) Immunoblotting analysis of expression of micropeptide CIP2A-BP and β-actin in TNBC cells cultured with or without TGF-β.

(J) Smad4 siRNA and corresponding control transfected TNBC cells were cultured with or without TGF-β. The indicated proteins were determined by Immunoblotting analysis.

(K) TNBC cells were pretreated with specific antagonist against Smad3 (SIS3, 3μM) for 1h and then cultured with or without TGF-β. The indicated proteins were determined by immunoblotting analysis.

(L) 4E-BP1 siRNA and corresponding control transfected TNBC cells were cultured with or without TGF-β. The indicated proteins were determined by immunoblotting analysis.

Data information: Data are representative of 3 (C) or 4 (F and G) independent experiments. Data were assessed by paired Student's t test (C, F, and G) and are represented as mean ± SD. **P < 0.01; ***P < 0.001.