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Versadoc mp 4000 imaging system

Manufactured by Bio-Rad
Sourced in United States

The Versadoc MP 4000 imaging system is a multi-purpose imaging device designed for use in life science laboratories. It is capable of capturing high-quality images of various types of gel-based assays, including Western blots, DNA gels, and protein gels. The system utilizes a charge-coupled device (CCD) camera and advanced imaging software to produce accurate and reproducible results.

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11 protocols using versadoc mp 4000 imaging system

1

Western Blot Analysis of T-cell Proteins

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Western blot experiment was performed given the previously described methods (Sun et al., 2019 (link)). CD4+ T cells, Jurkat T cells, naive CD4+ T cells and mouse spleen cells were harvested. The proteins were extracted with RIPA lysis buffer (Beyotime, Shanghai, China) and the protein concentrations were quantified using a bicinchoninic acid (BCA) Protein Assay Kit (TaKaRa). The same amount of protein samples were separated by SDS-polyacrylamide gel electrophoresis (SDS-PAGE, Thermo Fisher Scientific) and then transferred into polyvinylidene fluoride (PVDF) membranes (Thermo Fisher Scientific). The membranes were blocked with 5% skimmed milk and then incubated with anti-HUWE1 (ab70161, 1:2,000, Abcam), anti-FoxP3 (ab20034, 1:1,000, Abcam), anti-Ets-1 (ab220361, 1:1,000, Abcam), anti-p-Ets-1 (44-1107G, 1:1,000, ThermoFisher Scientific), anti-MEK1 (ab32576, 1:10,000, Abcam) and anti-GAPDH (ab8245, 1:500, Abcam) overnight at 4°C. The membranes were washed with TBST and incubated with the secondary antibody (ab205718, 1:2,000, Abcam) for 1 h at room temperature. The enhanced chemiluminescence reagents (Thermo Fisher Scientific) and the Versadoc MP 4000 imaging system (Bio-Rad) were performed to visualize protein bands.
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2

Recombinant VEGF165 Expression in E. coli

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The expression of the recombinant VEGF165 protein in E. coli BL21 cells was evaluated by SDS-PAGE and Western Blot. The total protein extract (30 µg) and the purified protein were mixed to loading buffer, heated for 5 min and applied on the gel. 15% SDS-PAGE electrophoresis was conducted in buffer (25 mM Tris; 250 mM Glycine; 1‰ SDS) for 2 h. Separated proteins were directly electro-blotted onto a nitrocellulose membrane in buffer (39 mM Glycine; 48 mM Tris; 0.037% SDS; Methanol 20%) for 1 h at constant voltage (15 V). The membrane was stained with Ponceau S then distained using bi-distilled water, to verify protein-transfer efficiency. The membrane was blocked for 1 h at room temperature with 5% skim milk in phosphate-buffered saline (0.9% NaCl in 10 mM phosphate buffer, pH 7.4) with Tween-20. Immuno-blotting was carried out by incubating the membrane with primary antibody Anti-His Sigma-Aldrich diluted to 1:5000; then with the appropriate Horseradish Peroxidase conjugated secondary antibody diluted to 1:5000. Peroxidase activity was detected using the Amersham enhanced chemo-luminescence system and autoradiography or densitometric analysis performed by the Versadoc MP4000 imaging system (Bio-Rad).
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3

Western Blot Analysis of OaPV3 Antigens

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Sera collected from rats immunized with rGST-OaPV3 E6 and rGST-OaPV3 L1 were tested by western immunoblotting against total lysates obtained from E. coli respectively expressing rGST-OaPV3 E6 or rGST-OaPV3 L1. Briefly, total lysates were resolved by SDS-PAGE on 10% gels, and proteins were subsequently blotted onto nitrocellulose membrane (1 h at 250 mA). Membranes were blocked with 5% skim milk in PBS-0.05% Tween (PBS-T) for 1 h. Rat sera collected at T0, T1, T2, and T3 were used at final dilutions of 1:100, 1:500, and 1:1000 in 2% skim milk PBS-T. Incubation was carried in a Mini-PROTEAN II Multiscreen Apparatus (Bio-Rad) for 1 h. After three washing steps, membranes were incubated for 1 h with an anti-rat IgG-HRP secondary antibody (Southern Biotech) diluted 1:50.000 in 2% skim milk PBS-T. After five washes, membranes were developed with the Chemiluminescent Peroxidase Substrate (Sigma-Aldrich) and images were acquired with a VersaDoc MP 4000 Imaging System (Bio-Rad).
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4

Characterization of Soluble HLA Proteins

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Protein samples were resolved using standard denaturing polyacrylamide gel electrophoresis (SDS-PAGE) using Criterion 4–20% Tris-HCl gels (BioRad). Proteins were then transferred onto a nitrocellulose membrane using standard overnight “wet” transfer protocols. After being blocked for 1 h in 2% bovine serum albumin (Sigma), membranes were probed with the following monoclonal antibodies against HLA gene products: class I: HLA-ABC [clone EMR8-5; 33 and 41 kDa]; class II: HLA-DRB1 [clone EPR6148; 30 kDa], HLA-DQ [clone TAL 4.1; 28 kDa], HLA-DMB [clone EPR7982; 29 kDa], HLA-DQA1 [clone EPR7300; 28 kDa and 33–35 kDa] were obtained from Abcam (Cambridge, MA, USA). The resulting immunoblots were developed using ECL Prime Western Blotting Detection Reagent (GE Healthcare Amersham) and visualized/images captured using a Versadoc MP 4000 imaging system (BioRad). Densitometry was performed with global background subtraction using the Quantity One software. Representative images of blots for each of the soluble HLA gene products tested are provided online as Supplemental Materials or at https://figshare.com/s/1d858cd5563acb58d381 (DOI https://doi.org//10.6084/m9.figshare.5998574).
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5

Western Blot Analysis of Phospho-p38MAPK in Platelets

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Human platelets were incubated with mAb (NIT A, NIT B or NIT F) and DANA or 10 μM PP1, or 10 μM SB253580 as described above and lysed in 1 × Laemmli buffer. For detection of phospho-p38MAPK, 1 × Halt protease inhibitor cocktail (Thermo Scientific) was also added. Samples were reduced with addition of 0.1 M dithiothreitol and boiled at 95°C for 10 min. Platelet lysate was separated by SDS–polyacrylamide gel electrophoresis, transferred onto polyvinylidene difluoride membrane (GE Healthcare). For RCA-1 staining, membranes were probed with biotin-conjugated RCA-1 (2 μg ml−1) (Vector Labs) according to the manufacturer's instructions, mouse anti-human CD41b antibody (1:5,000) (clone EPR6995, Abcam) and with β-actin antibody (1:400) (clone C1, Santa Cruz). For phospho-p38MAPK, membranes were probed with phospho-p38MAPK (Thr180/Tyr182) antibody (1:5,000) (Cell Signaling Techonology) at 4 °C overnight. Avidin conjugation to RCA-1 was performed with a Vectastain ABC kit (Vector Labs) according to the manufacturer's instructions. HRP-conjugated secondary anti-mouse antibody (1:5,000) (Santa Cruz) was then utilized. Blots were developed by ECL (Thermo Scientific) and visualized on the VersaDoc MP 4000 imaging system (Bio-Rad). Uncropped immunoblots are shown in Supplementary Fig. 9.
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6

IgG Depletion Reproducibility Evaluation

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The IgG depletion procedure was repeated three times using serum samples collected from the same individual at different dates. For each experiment, SDS-PAGE gels were run to visually examine reproducibility of the depletion. Briefly, 20 μg protein from the serum, the IgG-depleted serum and the IgG-containing fraction was loaded into the wells of a 12% SDS-polyacrylamide gel and the gel was run at 180 V for 50 minutes before staining with Colloidal Coomassie blue (Bio-Rad, CA). Images of the gels were captured by VersaDoc MP 4000 imaging system (BioRad, CA) and analysed with Quantity One software (BioRad, CA).
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7

Identifying Conserved Immunogenic Proteins

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Enriched liposoluble proteins from PG2 T and from the 3 field isolates were pooled to identify conserved proteins that induce an immune response. Pools were resolved both by SDS-PAGE and 2D PAGE. Subsequently, proteins were transferred onto nitrocellulose membranes with a Mini-Trans-Blot Cell (Bio-Rad) at 250 mA for 1 hour (1D-WB), or with a Trans-Blot ® Plus Cell (Bio-Rad) at 0.15 A O/N at 4°C (2D-WB). After blotting, membranes were blocked with PBS-T containing 5% skim milk and incubated for 1 h with individual sera collected from naturally infected sheep, or pooled sera, in both cases diluted 1:1000 in PBS-T containing 2% skim milk. After 3 washes with PBS-T, membranes were incubated with anti-sheep IgG secondary HRP-conjugated antibodies (Southern Biotech) diluted 1:50.000 in PBS-T containing 2% skim milk. After 5 washing steps, membranes were developed with Chemiluminescent Peroxidase Substrate (Sigma-Aldrich) and images were acquired with a VersaDoc MP 4000 Imaging System (Bio Rad).
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8

Proteome Profiling of Plasma and Muscle

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Here, we briefly summarise the 2-DE procedure as the procedure was described in detail earlier [10 (link),23 (link),50 (link)]. Proteomic analysis of depleted plasma samples and prepared muscle biopsies was carried out using Ettan IPGphor 3 IEF System (GE Healthcare, Buckinghamshire, UK) (first dimension) and Ettan DALTsix Electrophoresis Unit (Amersham, Pharmacia, Uppsala, Sweden) (second dimension). The fluorescent stain SYPRO Ruby (Bio-Rad Laboratories, Hercules, CA, USA) was applied to plasma protein gels, and silver stain was applied to muscle biopsy gels. The stained protein pattern was visualized using a charge coupled device camera (VersaDoc Imaging system 4000 MP, Bio-Rad). The PDQuest Advanced (v. 8.0.1, Bio-Rad) software was used to analyse and quantify the protein pattern. The amount of protein in a certain spot was assessed as background corrected optical density integrated over all pixels in the spot and expressed as integrated optical density (IOD). The parts per million (ppm) values for all proteins were generated and used for further statistical analysis.
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9

KPC-2 and KPC-17 Plasmid Characterization

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Plasmid DNA was extracted from KPC-2 and KPC-17 KPs with the Qiagen Midi Kit (Qiagen). HindIII digested plasmids were separated in 0.8% agarose and transferred to nylon membranes for Southern hybridization. KPC-containing fragments were identified by hybridization with Dig-labeled blaKPC-specific probe generated by the DIG High Prime DNA Labeling and Detection Starter Kit II (Roche Applied Sciences, Germany). The images were visualized by using the VersaDoc Imaging System 4000MP (Bio-Rad, USA).
The extracted KPC-2- and KPC-17-producing plasmids described above were also transformed into NEB 10-beta electrocompetent E.coli recipients (C3020K, BioLabs) by using the Gene Pulser Xcell™ electroporation system (Bio-Rad). Transformants were confirmed to have blakpc-2 or blaKPC-17 by PCR and sequencing analysis. Extracted plasmid DNA from the transformants was digested with HindIII and separated in a 0.8% agarose gel. The agarose gel was stained with ethidium bromide and visualized by using the Gel Doc™ XR+ system (Bio-Rad, USA).
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10

Evaluating Antifungal Efficacy of NFAP Peptides

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To examine
the yeast cell-killing efficacy of the generated NFAP γ-core
peptide derivatives, the growth ability of C. albicans SC5314 was monitored in the presence of 0.5× MIC, 1× MIC,
and 2× MIC of the peptides that proved to be effective in the
antifungal susceptibility tests. The experiment was conducted in a
flat-bottom 96-well microtiter plate (TC Plate 96 Well, Suspension,
F; Sarstedt, Nümbrecht, Germany): 100 μL of OD600 = 0.2 mid-log phase cells prepared in LCM were mixed with 100 μL
of 1× MIC, 2× MIC, or 4× MIC of the peptide diluted
in LCM. The plates were incubated statically at 30 °C for 24
h. The absorbance (OD600) of each well was then measured
after shaking for 5 s every hour using a microtiter plate reader (BioTek
Synergy HTX Multi-Mode Microplate Reader; Agilent Technologies, Santa
Clara, CA, USA). Untreated cells (100 μL LCM mixed with 100
μL OD600 = 0.2 mid-log phase cells prepared in LCM)
served as growth controls. To examine the viability of the treated C. albicans cells, 5–5 μL cultures from
each well were dropped onto the YPD agar plate after the last OD600 measurement and allowed to dry before incubation at 30
°C for 24 h. The plates were photographed (Versa Doc Imaging
System 4000 MP; Bio-Rad, Hercules, CA, USA). These experiments were
repeated two times, involving three technical replicates.
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