Journal: bioRxiv

Article Title: Integration of Patient-Derived Organoids and Organ-on-Chip Systems: Investigating Colorectal Cancer Invasion within the Mechanical and GABAergic Tumor Microenvironment

doi: 10.1101/2023.09.14.557797

Figure Lengend Snippet: (A.) Schematic representing the initial events of the metastatic cascade that can be measured using the CRC-OOC. Tumor cells in the top channel (1) can be visualized and analyzed separately from tumor cells that have invaded and adhered in the endothelial compartment (2). Additionally, tumor cells that are found in the endothelial effluent (3; circulating tumor cells (“CTC-like” cells)) can also be collected and analyzed. (B.) Circulating tumor cells were collected from the endothelial effluent of stretched and not stretched HCT116 CRC-Chips and RNAseq was performed. GO Pathway analysis was performed on a subset of genes with either a 2-fold difference between stretched and not stretched CTCs or an FDR-adjusted p-value <0.1. N=2 biological replicates with 3 pooled chips in each replicate. (C.) Gene expression of neurotransmitter-related genes were measured by a neurotransmitter-specific PCR array. HCT116 tumor cells of stretched and not stretched chips were harvested on day 6 from the top epithelial channel and isolated via FACs. Data is displayed as the gene expression fold change of stretch versus not stretch conditions Expression was normalized to the average of 5 housekeeping genes. Genes that had a 1.5-fold increase or decrease in the stretched condition are displayed. N=3 biological replicates with 3 chips pooled per biological replicate. (D.) Schematic of the production of GABA from glutamate by the enzyme GAD1. In this figure, experiments related to GABA are indicated in purple and experiments related to GAD1 are indicated in light blue. (E.) Representative confocal immunofluorescent images of the epithelial (top; 1) or endothelial (bottom; 2) channel of the CRC-Chips stained for GABA (purple) on day 6. Invaded HCT116 H2B-GFP stain positive for GABA, while HCT116 H2B-GFP tumor cells that are in the top channel stain weakly for GABA. DAPI stains the nuclei of Caco2 C2BBe1 cells in the top channel and endothelial cells in the bottom channel. Scale bars represent 200 μm in the top channel image and 100 μm in the bottom channel images. Top channel images are maximum projections that span a 35 μm Z-height with a 5 μm step size. Bottom channel images are maximum projections that span a 10 μm Z-height with a 5 μm step size. (F.) RNAseq analysis was performed on CRC organoids and normalized GAD1 expression is shown. N=5 independent donors with 2-3 replicates each. Individual data points are shown and mean ± SEM is displayed. Analysis between US and UP data was performed using an unpaired t-test; ***p<0.001 ( G.) CRC organoids were isolated from stretched chips and qPCR analysis of GAD1 gene expression was performed. N=5 independent doners with 3 replicates each. Individual data points are shown and mean ± SEM is displayed. Analysis between US and UP data was performed using an unpaired t-test p<0.05. ( H.) GAD1 mRNA expression from TCGA in KRAS, NRAS, or BRAF mutant primary colon cancer tumors. N=196 patients with KRAS, NRAS, or BRAF mutant tumors; N=201 patients with KRAS, NRAS, or BRAF wildtype tumors. Individual data points are shown and median with interquartile range is represented. Data was analyzed with an unpaired t-test; ****p<0.0001. ( I.) Kaplan-Meier curve with univariate analysis of the survival of patients with KRAS, NRAS, or BRAF mutated CRC tumors based on high versus low expression of GAD1 (defined as above or below the median GAD1 mRNA expression z-score of 0.3). Data was extracted from the TCGA. N=254 patients. Data was analyzed using a log-rank (Mantel-Cox test). ( J.) Effluent from the epithelial channel of the patient-derived organoids was collected on day 0 (D0) and day 6 (D6). GABA intensity was analyzed from extracted metabolites N=6 chips per timepoint per patient; n=4 on D0 and 2 on D6 for UK. Data was analyzed using a two-way ANOVA; ***p<0.001; ****p<0.0001. ( K .) US-H2B-GFP (top) and UP-H2B-GFP (bottom) stretched tumor-chips were stained for GABA (purple). Scale bars represent 200 μm. L. Representative 10x immunofluorescence images of the 5 tumors stained for EpCAM (green), CK20 (red), and GABA (purple). Scale bars represent 500 μm and 200 μm for UK. All schematics were made in or are from BioRender.

Article Snippet: ABAT human shRNA lentiviral particles (Santa Cruz Biotechnology, Inc., #sc-93288-V) and control shRNA lentiviral particles (Santa Cruz Biotechnology, Inc., #sc-108080) were used to produce HCT116 H2B-GFP ABAT knock down cells at a multiplicity of infection (MOI) of 5 and 2 mg/mL of puromycin (Santa Cruz Biotechnology, #sc-108071) was used to select for knocked down cells.

Techniques: Gene Expression, Isolation, Expressing, Staining, Mutagenesis, Derivative Assay, Immunofluorescence

Journal: bioRxiv

Article Title: Integration of Patient-Derived Organoids and Organ-on-Chip Systems: Investigating Colorectal Cancer Invasion within the Mechanical and GABAergic Tumor Microenvironment

doi: 10.1101/2023.09.14.557797

Figure Lengend Snippet: (A.) Invasion of HCT116 tumor-chips in the presence or absence of exogenous GABA (flowed through the epithelial channel) was measured on day 6 (D6) of the experiment and normalized to day 0 (D0) invasion. N=6 chips. Individual data are shown, with mean ± SEM represented and analyzed using a one-way ANOVA; ****p<0.0001. (B.) Intracellular [ 13 C 4 ]GABA or unlabeled GABA was measured via mass spectrometry-based metabolomics in the HCT116 tumor-chips after the addition of exogenous GABA for six days. N=3 chips. (C.) Schematic of GABA catabolism by ABAT, subsequent entry into the TCA cycle, and inhibition of ABAT activity by vigabatrin. In this figure, experiments related to GABA are indicated as purple, and experiments related to ABAT are indicated as teal. (D.) Western blot analysis of ABAT in shRNA control or ABAT shRNA HCT116 tumor cells. Cropped western blot (left) and quantification (right) confirm knockdown of ABAT. (E.) Growth rate of ABAT-knockdown or control HCT116 tumor cells when grown in traditional cell culture methods. N=3. Individual data are shown and mean ± SEM are represented. Data was analyzed using a t-test; **p<0.01. (F.) Numbers of ABAT-knockdown or control HCT116 tumor cells in the top channel on-chip as measured via fluorescence microscopy and quantified on day 0 (D0) and day 6 (D6). N=5-6 chips. Individual data are shown and mean ± SEM are represented. Data was analyzed using a two-way ANOVA; *p<0.05;***p<0.001. (G.) Invasion of ABAT knockdown (KD) or control shRNA HCT116 tumor-chips in the presence or absence of stretching was measured on day 6 (D6) of the experiment and normalized to day 0 (D0) invasion. N=5-6 chips. Individual data points are shown and mean ± SEM are represented. Data was analyzed using a one-way ANOVA; *p<0.05. (H.) Numbers of HCT116 tumor cells in the top channel on-chip in the presence or absence of stretching, with or without vigabatrin was measured via fluorescence microscopy and quantified on day 0 (D0) and day 6 (Day 6). Individual data are shown and mean ± SEM are represented. N=4 chips. Data was analyzed using a two-way ANOVA; **p<0.01. (I.) Invasion of HCT116 tumor-chips in the presence or absence of stretching, with or without vigabatrin was measured on day 6 (D6) of the experiment and normalized to day 0 (D0) invasion. N=4 chips. Individual data points are shown and mean ± SEM are represented. Data was analyzed using a one-way ANOVA; ***p<0.001. (J.) Numbers of US-H2B-GFP (red) or UP-H2B-GFP (blue) tumor cells in the top channel on-chip in the presence or absence of stretching, with or without vigabatrin was measured via fluorescence microscopy and quantified on day 0 (D0) and day 6 (Day 6). N=4-5 chips. Individual data are shown and mean ± SEM are represented. Data was analyzed using a two-way ANOVA; ns=p>0.05. (K.) Invasion of US-H2B-GFP or UP-H2B-GFP organoid-tumor chips in the presence or absence of stretching, with or without vigabatrin was measured on day 6 (D6) of the experiment and normalized to day 0 (D0) invasion. N=4-5 chips. Individual data are shown and mean ± SEM are represented. Data was analyzed using a one-way ANOVA; **p<0.01. All schematics were made in or are from BioRender.

Article Snippet: ABAT human shRNA lentiviral particles (Santa Cruz Biotechnology, Inc., #sc-93288-V) and control shRNA lentiviral particles (Santa Cruz Biotechnology, Inc., #sc-108080) were used to produce HCT116 H2B-GFP ABAT knock down cells at a multiplicity of infection (MOI) of 5 and 2 mg/mL of puromycin (Santa Cruz Biotechnology, #sc-108071) was used to select for knocked down cells.

Techniques: Mass Spectrometry, Inhibition, Activity Assay, Western Blot, shRNA, Control, Knockdown, Cell Culture, Fluorescence, Microscopy

Journal: Advanced Science

Article Title: Electrochemically Synthesis of Nickel Cobalt Sulfide for High‐Performance Flexible Asymmetric Supercapacitors

doi: 10.1002/advs.201700375

Figure Lengend Snippet: The XRD patterns a) of Ni–Co–S/GF and GF. Raman spectra b) obtained for PPy/GF, Ni–Co–S/GF, GF, and PPy (inset figure (b)). XPS spectrum of Ni–Co–S/GF: c) Ni 2p, d) Co 2p, e) S 2p, (f) C 1s and inset figure (f) is XPS survey spectrum of Ni–Co–S/GF.

Article Snippet: TEM (JEOL‐2100) and high‐resolution transmission electron microscopy (HRTEM; JEOL JEM‐2010F), Raman spectra were obtained via a confocal microscope Raman spectrometer system (Witec Alpha 300; with the wavelength excitation laser of 488 nm) and XRD (Bruker Focus D8 with Cu Kα radiation, Smart lab).

Techniques:

Journal: bioRxiv

Article Title: Sterols lower energetic barriers of membrane bending and fission necessary for efficient clathrin mediated endocytosis

doi: 10.1101/2021.01.31.428633

Figure Lengend Snippet: A) Overview of recovery conditions. Following AY9944 sterol depletion, HEK293T hCLTA-Tq2 EN cells were exposed to cholesterol-loaded MβCD (MβCD-Chol, and chased in LPDS media) [Top] , supplemented continuously with lipoprotein-rich 15% FBS in the presence of AY9944 [Middle] , or incubated continuously in 7.5% LPDS media in the absence of AY9944 to allow endogenous cholesterol synthesis [Bottom] . B) Mid-plane live-cell confocal microscopy of HEK293T hCLTA-Tq2 EN following addition of transferrin-conjugated to AF-555 (Tfn-555) during recovery as described in (A). Representative images from different fields of view shown. Tfn and clathrin distributions in normal and arrested CME [Inset] . Scale bar = 10 μm. C) Corresponding cellular sterol profiles quantified by GC/MS (Mean ± SD). N = 3 biological replicates from independent experiments. Dotted and dashed lines represent total sterol abundance of untreated FBS and LPDS cultured cells, respectively.

Article Snippet: HEK293T cells were then incubated with transferrin (Tfn) conjugated to Alexa FluorTM 555 (25 ug/mL, Invitrogen) for 30 mins at 37°C, followed by rinsing in ice-cold PBS, and fixation in 4% paraformaldehyde for 20 min. For high-content imaging analysis, 24 well glass bottom plates (Cellvis) were imaged using CX7 Rescue High-Content Screening (HCS) Navigator software (PerkinElmer, Waltham, MA) and standard HCS imaging protocol.

Techniques: Incubation, Confocal Microscopy, Gas Chromatography-Mass Spectrometry, Cell Culture

Journal: bioRxiv

Article Title: Sterols lower energetic barriers of membrane bending and fission necessary for efficient clathrin mediated endocytosis

doi: 10.1101/2021.01.31.428633

Figure Lengend Snippet: The ability of structurally diverse sterols to rescue CME inhibition due to sterol depletion by AY9944 treatment was evaluated by direct delivery of sterols to the PM via MβCD carrier. A) Summary of physical properties and phase separation behavior of sterols. Topological Polar Surface Area (TPSA) computed surface sum over all polar atoms. Ordered lipid ( L o ) domain (raft) stabilizing (+) or disrupting (−) sterols indicated relative to cholesterol (++). Refer to Table S2 for additional details. B) Sterol profiles of AY9944 treated HEK293T cells following 1h incubation with sterol loaded MβCD (Mean ± SD). N = 4 independent biological replicates from two MβCD-sterol preparations. C) Tfn uptake relative to controls cultured in 7.5% LPDS for 48 h (Mean ± SD). *, P < 0.05; **, P < 0.01; ***, P < 0.001; ****, P < 0.0001; one-way ANOVA (F(12, 51) = 11.23, p < 0.0001) and Dunnett’s test versus LPDS control (N = 5 biological replicates from 3 independent experiments, ~1,500 cells per replicate). Cholesterol, desmosterol, 7DHC, and lathosterol support formation of L o domains in model membranes as designated. D) Representative confocal images taken mid-plane following 30 min incubation with AF-555 conjugated transferrin (Tfn). Scale bar = 20 μm. (c), Commercially available, pre-loaded MβCD-Chol.

Article Snippet: HEK293T cells were then incubated with transferrin (Tfn) conjugated to Alexa FluorTM 555 (25 ug/mL, Invitrogen) for 30 mins at 37°C, followed by rinsing in ice-cold PBS, and fixation in 4% paraformaldehyde for 20 min. For high-content imaging analysis, 24 well glass bottom plates (Cellvis) were imaged using CX7 Rescue High-Content Screening (HCS) Navigator software (PerkinElmer, Waltham, MA) and standard HCS imaging protocol.

Techniques: Inhibition, Incubation, Cell Culture, Control

Journal: Cell reports

Article Title: Pten regulates endocytic trafficking of cell adhesion and Wnt signaling molecules to pattern the retina

doi: 10.1016/j.celrep.2024.114005

Figure Lengend Snippet: KEY RESOURCES TABLE

Article Snippet: Micro BCA TM Protein Assay Kit , ThermoFisher Scientific , Cat# #23235 RRID: N/A.

Techniques: Control, Affinity Purification, Recombinant, Bicinchoninic Acid Protein Assay, Western Blot, Electron Microscopy, RNAscope, Multiplex Assay, Mass Spectrometry, Mutagenesis, Software, Microscopy

Journal: The EMBO Journal

Article Title: Limited oxygen in standard cell culture alters metabolism and function of differentiated cells

doi: 10.1038/s44318-024-00084-7

Figure Lengend Snippet: Reagents and tools table

Article Snippet: Maintenance of iPSCs: Human induced pluripotent stem cells (iPSCs) were maintained on vitronectin XFTM (10 μg/mL, StemCell Technologies)-coated plates and in Essential 8 (E8) medium consisting of DMEM/F12 (Gibco), l -ascorbic acid 2-phosphate (1%), insulin-transferrin-selenium solution (2%, Life Technologies), sodium bicarbonate (0.7%), and Penicillin/Streptomycin (P/S) (1%), freshly supplemented with TGFβ (10 ng/mL, R&D) and FGF2 (12 ng/mL, Qkine).

Techniques: Recombinant, Affinity Purification, Sequencing, Saline, Bicinchoninic Acid Protein Assay, Reverse Transcription, SYBR Green Assay, Software, Imaging, Gas Chromatography, Mass Spectrometry, Microscopy

Journal: Nature Communications

Article Title: RNF168 and USP10 regulate topoisomerase IIα function via opposing effects on its ubiquitylation

doi: 10.1038/ncomms12638

Figure Lengend Snippet: ( a ) Identification of RNF168-associated proteins. A representative SDS–polyacrylamide gel electrophoresis of Flag-RNF168-associated proteins. Flag-tagged RNF168 was transfected in HEK293T cells and pull-down analysis was performed 48 h later. Protein bands were detected by silver staining. Protein bands were identified by mass spectrometry analysis following in-gel protease digestion. ( b ) HEK293T cells were transfected as indicated with HA-tagged RNF168 and Flag-TOP2α expression vectors. Cells were lysed and IP was performed using anti-Flag antibody. The resulting precipitates were subjected to IB analysis with the indicated antibodies. WCL, whole-cell lysate. ( c ) TOP2α, RNF168 and IgG (control) immunoprecipitates from HEK293T cells were examined by IB as indicated. ( b , c ) Data are representative of three independent experiments. ( d ) Cells treated with EdU were used for detection of localization patterns of TOP2α (Alexa Fluor 488) and RNF168 (Alexa Fluor 594) using confocal microscopy. Scale bar, 20 μm.

Article Snippet: After washing with 3% BSA in PBS, the sheep polyclonal against RNF168 (1:2,000; R&D systems cat# AF7217) and the rabbit polyclonal against TOP2α (Abcam) were detected using their respective secondary antibodies.

Techniques: Polyacrylamide Gel Electrophoresis, Transfection, Silver Staining, Mass Spectrometry, Expressing, Control, Confocal Microscopy

Journal: Nature Communications

Article Title: RNF168 and USP10 regulate topoisomerase IIα function via opposing effects on its ubiquitylation

doi: 10.1038/ncomms12638

Figure Lengend Snippet: ( a ) Representative agarose gel of in vitro kinetoplast DNA-based decatenation assays performed for 10 min with different amount of nuclear extracts from WT and Rnf168 −/− MEFs. Catenated and decatenated kDNA were separated by electrophoresis using 1% agarose gel. IB show Top2α's level in the total nuclear extracts used for this assay. ( b ) Representative data of the mitotic inhibition assay of decatenation G2 checkpoint in WT and Rnf168 −/− primary MEFs. Cells were treated with DMSO or ICRF-193 for 15 min and then incubated in culture media for an additional 2 h. The fraction of mitotic cells (pHH3 + ) was determined by flow cytometry. ( c ) Bar graphs represent the mean inhibition of mitotic index 2 h post ICRF-193 treatment of passage 1 primary MEFs (% pHH3 + cells post ICRF-193 treatment compared with DMSO-treated controls). * P <0.05. ( d ) Bar graphs represent the mean inhibition of mitotic index 2 h post ICRF-193 treatment of RIDDLE cells reconstituted with either HA-RNF168 or HA-empty vector as in c . * P <0.05. ( e ) Analysis of decatenation G2 checkpoint of Rnf168 −/− and WT 3T3 MEFs using the mitotic entry assay. Percentage of pHH3 + cells is shown at the indicated time post-treatment with colcemid in the presence of DMSO or ICRF-193. * P <0.05; Rnf168 −/− MEFs compared with WT MEFs 6 h post-ICRF-193 treatment. ( f ) Bar graphs represent the mean fraction of pHH3 + WT and Rnf168 −/− MEFs evading G2 arrest 6 h post-treatment with ICRF-193 compared with DMSO-treated cells as in e . * P <0.05. ( g ) Mitotic entry assay of decatenation G2 checkpoint in human RIDDLE cells reconstituted with HA-empty vector or HA-RNF168. Percentage of pHH3 + cells is shown at the indicated times post-treatment with colcemid with or without ICRF-193. * P <0.05, RIDDLE cells reconstituted with HA-empty vector compared with RIDDLE cells reconstituted with HA-RNF168 at 6 h post-ICRF-193 treatment. ( h ) Bar graphs represent the mean fraction of RIDDLE cells (reconstituted with HA-empty vector compared with those reconstituted with HA-RNF168) evading G2 arrest 6 h post ICRF-193 treatment compared with DMSO-treated controls as in f . * P <0.05. Three independent experiments in triplicates unless specified. Error bars in c , d , f and h represent mean±s.e.m.

Article Snippet: After washing with 3% BSA in PBS, the sheep polyclonal against RNF168 (1:2,000; R&D systems cat# AF7217) and the rabbit polyclonal against TOP2α (Abcam) were detected using their respective secondary antibodies.

Techniques: Agarose Gel Electrophoresis, In Vitro, Electrophoresis, Inhibition, Incubation, Flow Cytometry, Plasmid Preparation

Journal: Nature Communications

Article Title: RNF168 and USP10 regulate topoisomerase IIα function via opposing effects on its ubiquitylation

doi: 10.1038/ncomms12638

Figure Lengend Snippet: ( a – d ) Sensitivity of WT and Rnf168 −/− MEFs to ICRF-193 ( a , b ) or etoposide ( c , d ) was determined using clonogenic assays. ( e , f ) Sensitivity of the human breast cancer cell lines T47D and MDA-MB-231 to etoposide was determined using clonogenic assays. ( a , c , e ) Data are presented as the mean±s.e.m. ( a , c , n >4; e , n =4). * P <0.05 for Rnf168 −/− MEFs compared with WT MEFs and T47D and MDA-MB-231 cells knocked down for RNF168 (sh.RNF168) compared with their respective controls (Sh.Ctr: ShRNA control). ( b , d ) Representative pictures of dishes showing surviving WT and Rnf168 −/− colonies post ICRF-193 ( b ) or etoposide ( d ) treatment. ( f ) Representative pictures of dishes showing surviving colonies of etoposide treated T47D and MDA-MB-231 cells.

Article Snippet: After washing with 3% BSA in PBS, the sheep polyclonal against RNF168 (1:2,000; R&D systems cat# AF7217) and the rabbit polyclonal against TOP2α (Abcam) were detected using their respective secondary antibodies.

Techniques: shRNA, Control

Journal: Nature Communications

Article Title: RNF168 and USP10 regulate topoisomerase IIα function via opposing effects on its ubiquitylation

doi: 10.1038/ncomms12638

Figure Lengend Snippet: ( a ) RIDDLE cells reconstituted with HA-RNF168 or HA-empty vector, and control HA-RNF168-reconstituted RIDDLE cells with TOP2α knock down were lysed and WCL subjected to IP with anti-TOP2α or IgG (control) antibodies. Immunoprecipitates were blotted with the indicated antibodies to detect ubiquitylated TOP2α. ( b ) Human breast cancer cell lines T47D and MDA-MB-231 knocked down for RNF168 (Sh.RNF168) and their control expressing ShRNA control (sh.Ctr) were examined for their level of ubiquitylated TOP2α as in a . ( c ) Rnf168 −/− , Brca1 −/− and WT MEFs were lysed and subjected to IP with anti-Top2α or IgG (control) antibodies. IPs from WCL were blotted with the indicated antibodies. ( d ) HEK293T cells were transfected with RNF168 (WT or mutant Rnf168-C21S), Flag-TOP2α and HA-Ub vectors as indicated. WCL were subjected to IP with anti-Flag, and IB analysis was performed using anti-HA antibody to detect ubiquitylated Flag-TOP2α. ( e ) Nuclear extracts from RIDDLE cells reconstituted with HA-RNF168 or HA-empty vector were subjected to IP with anti-TOP2α or IgG (control) antibodies. Immunoprecipitates were blotted with the indicated antibodies against K63- and K48-Ub linkages. ( f ) In vitro ubiquitylation of recombinant TOP2α in the presence of recombinant RNF168 (500 ng for lane 5, 1 μg for lanes 2, 3 and 6 and 2 μg for lane7), UBE1 (E1), UBE2E2 (E2) and Ub. Nuc, nuclear extract; WCL, whole-cell lysate.

Article Snippet: After washing with 3% BSA in PBS, the sheep polyclonal against RNF168 (1:2,000; R&D systems cat# AF7217) and the rabbit polyclonal against TOP2α (Abcam) were detected using their respective secondary antibodies.

Techniques: Plasmid Preparation, Control, Knockdown, Expressing, shRNA, Transfection, Mutagenesis, In Vitro, Recombinant

Journal: Nature Communications

Article Title: RNF168 and USP10 regulate topoisomerase IIα function via opposing effects on its ubiquitylation

doi: 10.1038/ncomms12638

Figure Lengend Snippet: ( a ) WT and Rnf168 −/− MEFs, and Top2α knockdown control MEFs were fixed and stained with DAPI. Representative cells with defective chromosome segregation, as indicated by chromosome bridges (arrow head) and micronuclei (arrow) are shown. ( b ) Histograms show quantification of cells with chromosome bridges or micronuclei (mean±s.e.m., n =3). * P <0.05. ( c ) Histograms show the fraction of RIDDLE cells reconstituted with HA-RNF168 or HA-empty vector that display micronuclei (mean±s.e.m., n =3). * P <0.05. ( d ; upper panels) Representative metaphase spreads showing undercondensed chromosomes in WT MEFs 24 h post ICRF-193 treatment (positive control), and in Rnf168 −/− DMSO-treated MEFs. ( d , lower panels) Representative metaphase spreads of DMSO-treated Rnf168 −/− MEFs complemented with RNF168-WT (WT) or the E3 ligase deficient RNF168-C21S (C21S). ( e ) Histograms show quantification of abnormal metaphase spreads with entangled or undercondensed chromosomes from the indicated cells (mean±s.e.m., n =3). * P <0.05 compared with WT MEFs. ( f ) Histograms present the mean fraction of MEFs evading ICRF-193-induced G2 arrest as compared with DMSO-treated controls (mean±s.e.m., n =3). Data are shown for WT MEFs, mock infected Rnf168 −/− MEFs and Rnf168 −/− MEFs complemented with RNF168-WT or RNF168-C21S. 3T3 MEFs were used for these experiments. Data shown are for 6 h post-treatment with colcemid±4 μM ICRF-193. * P <0.05 compared with WT MEFs. ( g ) Clonogenic assay was used to determine sensitivity to ICRF-193 of mock infected WT and Rnf168 −/− MEFs, as well as Rnf168 −/− MEFs complemented with RNF168 (WT or C21S mutant). Data are presented as the mean±s.e.m. ( n =4). * P <0.05 compared with WT MEFs. Scale bar, 20 μm.

Article Snippet: After washing with 3% BSA in PBS, the sheep polyclonal against RNF168 (1:2,000; R&D systems cat# AF7217) and the rabbit polyclonal against TOP2α (Abcam) were detected using their respective secondary antibodies.

Techniques: Knockdown, Control, Staining, Plasmid Preparation, Positive Control, Infection, Clonogenic Assay, Mutagenesis

Journal: Nature Communications

Article Title: RNF168 and USP10 regulate topoisomerase IIα function via opposing effects on its ubiquitylation

doi: 10.1038/ncomms12638

Figure Lengend Snippet: ( a ) Nuclear (Nuc) and chromatin (Chr) fractions prepared from WT, Rnf168 −/− and Brca1 −/− MEFs were analysed by IB for chromatin occupancy of Top2α. Additional IBs were performed with the indicated antibodies as controls. H4, histone H4. ( b ) Nuclear and chromatin fractions were prepared from the human breast cancer cell lines T47D and MDA-MB-231 knocked down for RNF168 (Sh.RNF168) and their controls (Sh.Ctr) and analysed by IB for the chromatin occupancy of TOP2α as in a . ( c ) HEK293T were transfected with Flag-TOP2α along with RNF168 (+) or empty vector (−) and their nuclear and chromatin fractions were prepared and examined by IB using the indicated antibodies. ( d ) A representative agarose gel showing decatenation activity of soluble nuclear and chromatin extracts from 2 WT and 2 Rnf168 −/− MEFs. In vitro kinetoplast DNA-based decatenation assay was performed for 20 min with different amounts of nuclear and chromatin extracts, and catenated and decatenated kDNA were separated by electrophoresis. IB using anti-Top2α was performed to show the level of Top2α present in each sample.

Article Snippet: After washing with 3% BSA in PBS, the sheep polyclonal against RNF168 (1:2,000; R&D systems cat# AF7217) and the rabbit polyclonal against TOP2α (Abcam) were detected using their respective secondary antibodies.

Techniques: Transfection, Plasmid Preparation, Agarose Gel Electrophoresis, Activity Assay, In Vitro, Electrophoresis

Journal: Nature Communications

Article Title: RNF168 and USP10 regulate topoisomerase IIα function via opposing effects on its ubiquitylation

doi: 10.1038/ncomms12638

Figure Lengend Snippet: ( a , b ) HEK293T cells were transfected with Flag-RNF168 and HA-USP10 vectors ( a ) or Flag-TOP2α and HA-USP10 vectors ( b ) as indicated. Cells were lysed and IP was performed using anti-Flag and anti-HA antibodies. The resulting precipitates were subjected to IB analysis with the indicated antibodies. WCL, whole-cell lysate. ( c ) HEK293T cells were transfected with Flag-TOP2α, RNF168, HA-USP10 and Myc-Ub vectors, as indicated. IP using anti-Flag and WCL was subjected to anti-Ub IB analysis to detect TOP2α ubiquitylation. ( d ) WT MEFs with knockdown of Usp10 (Sh1 and Sh2) and WT controls were examined for the level of Top2α ubiquitylation. Top2α was immunoprecipitated from whole-cell extracts and examined by IB for its ubiquitylation level using anti-Ub. IP using IgG was used as a control. The indicated antibodies were used for IB. ( e ) HEK293T cells were transfected with Flag-TOP2α with or without RNF168, HA-Ub, USP10 and USP10-C424A as indicated. TOP2α chromatin occupancy in these cells was examined by IB using anti-Flag antibodies and chromatin fractions (Chr). IB analysis of the chromatin fractions is also shown for the indicated antibodies. ( f ) A simplified model of RNF168-mediated regulation of TOP2α ubiquitylation and decatenation function.

Article Snippet: After washing with 3% BSA in PBS, the sheep polyclonal against RNF168 (1:2,000; R&D systems cat# AF7217) and the rabbit polyclonal against TOP2α (Abcam) were detected using their respective secondary antibodies.

Techniques: Transfection, Knockdown, Immunoprecipitation, Control