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6 protocols using icam 1 cd54

1

Neutrophil Subtyping by Flow Cytometry

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For flow cytometry analysis, cells were washed and incubated with Fc-receptor blockage using CD16/CD32 (Mouse BD Fc Block) (clone 2.4G2 (RUO), BD Pharmingen) and 5% rat serum (Invitrogen, Carlsbad, CA, USA) for 10 min prior to labeling. Subsequently, the cells were incubated with labelling antibodies for 20 min, washed and analyzed on the Attune NxT Acoustic Focusing Cytometer (Thermo Fisher Scientific). The following fluorescent-labeled antibodies were used for cell labeling: Ly6G (clone: 1A-8), ICAM-1 (CD54) (clone: 3E2), CD62L (L-Selectin) (clone: MEL-14), CXCR1 (clone: U45-632), all from BD Biosciences and CD11b (clone: M1/70) and CXCR2 (clone: SA044-G4), from BioLegend (San Diego, CA, USA). Neutrophil subsets were characterized using CD62L (L-Selectin) and ICAM-1 (CD54). Neutrophils were considered immature when expressing a CD62L + /ICAM-1(CD54)-phenotype and mature when expressing CD62L + /ICAM-1(CD54) + or CD62L-/ICAM-1(CD54) + 21 (link),22 (link).
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2

Endothelial Cell Surface Phenotyping

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The surface phenotype of EA.hy926 endothelial cells was determined by flow cytometry. Cells were fixed as described above. Direct labelling was performed for the following markers: endoglin/CD105 (BD Biosciences, Le Pont de Claix, France), ICAM-1/CD54 (BD Biosciences, Le Pont de Claix, France), and Platelet endothelial cell adhesion molecule PECAM1/CD31 (BD Biosciences, Le Pont de Claix, France). The cells were incubated for 30 minutes with antibodies. In all experiments, background labelling was assessed using the relevant fluorochrome-conjugated mouse IgG isotype control (BD Biosciences, Le Pont de Claix, France). Cells were centrifuged at 300 g for 5 minutes at 22°C then washed in PBS. Data acquisition was performed using a Guava easyCyte HT Flow Cytometer (Merck Millipore, Molsheim, France) and analysis carried out using the Incyte program. At least 10,000 events were collected for each sample.
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3

Endothelial Cell Surface Marker Expression

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The marker surface expression of EA.hy926 endothelial cells was determined by flow cytometry. Cells were fixed beforehand as described above. Direct labelling was performed for the following markers: endoglin-CD105 (BD Biosciences Cat# 563264, RRID:AB_2738104), ICAM-1-CD54 (BD Biosciences Cat# 740978, RRID:AB_2740602) and Platelet endothelial cell adhesion molecule PECAM1-CD31 (BD Biosciences Cat# 744077, RRID:AB_2741979). CD54 and CD31 were two principal adhesion molecules, which determine changes in endothelial permeability, activation and transendothelial leukocyte migration. The cells were incubated for 30 min with antibodies. In all of the experiments, background labelling was assessed using the relevant fluorochrome-conjugated mouse IgG isotype control (BD Biosciences, Le Pont de Claix, France). Cells were centrifuged at 300 g for 5 min at 22 °C and then washed in PBS. Data acquisition was performed using a Guava easyCyte HT Flow Cytometer (Merck Millipore, Molsheim, France) and the data were analysed using the Incyte programme. At least 10,000 events were collected for each sample.
Mycoplasma testing was performed to confirm the absence of contamination according to the recommended protocol (MycoStrip™–Mycoplasma Detection Kit # rep-mys-50 InvivoGen).
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4

Nanofibrillar Films and Atherosclerosis Resistance

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To assess the protective effects of aligned nanofibrillar films in resisting atherosclerosis by modulating EC orientation, 5×106 human monocytes (U937, ATCC) pre-labeled with Cell TrackerTM Red CMPTX (Life Technologies) were allowed to adhere onto EC-seeded randomly-oriented or aligned films after 24 hours of exposure to varying shear stress magnitudes. After 30 min in the presence of gentle agitation, unbound monocytes were removed with PBS, adherent monocytes were quantified from 10× images taken with a fluorescent microscope. To validate monocyte adhesion results, samples were also stained with ICAM-1 (CD54, BD Bioscience), followed by AlexaFluor 488 secondary antibody and Hoechst33342. ICAM-1 intensity was computed from 20× confocal images and then using ImageJ’s area tool to calculate the integrated density for 20 cells within each ring out of n=3 samples (100 cells per sample). Data is expressed as the fold change in ICAM-1 intensity on aligned nanofibrillar films, relative to values obtained from the corresponding random sample.
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5

Neutrophil Subset Characterization by Flow Cytometry

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The whole blood white blood cell (WBC) count with differential was assessed using an automated cell counter (Act10, Beckman Coulter, Brea, CA). Red blood cells were lysed for 5 minutes with 2 mL of Ammonium-Chloride-Potassium (ACK) lysing buffer, washed, and labeled for flow cytometry analysis. Cells were treated with Fc-receptor blockage prior to labeling with CD16/CD32 (Mouse BD Fc Block™) (clone 2.4G2 (RUO), BD Pharmingen, San Jose, CA, USA) and 5% rat serum (Invitrogen, Carlsbad, CA) for 10 minutes. Subsequently, labelling antibodies were incubated for another 20 minutes. The cells were washed and analyzed using an Attune® NxT™ Acoustic Focusing Cytometer (Thermo Fisher Scientific, Waltham, MA).
The following fluorescent-labeled antibodies were used for surface and intracellular labeling: Ly6G (clone: 1A-8), Ly6C (clone: AL-21), CD54 (ICAM-1) (clone: 3E2), L-Selectin (CD62L) (clone: MEL-14) all from BD Biosciences, San Jose, CA. Neutrophil (Ly-6G+/Ly-6C+) subsets were characterized using CD62L (L-Selectin) and CD54 (ICAM-1). The CD54(ICAM-1)-/CD62L+ neutrophil phenotype is considered to characterize naïve neutrophils, whereas the CD54(ICAM-1)+/CD62L- neutrophils are considered activated [11 (link),12 (link)].
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6

Characterization and Differentiation of MSCs

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Immunophenotypic characterization and differentiation capacities of MSCs was performed according to the methodology described by Montesinos et al. [35 (link)]. Monoclonal antibodies conjugated to FITC, PE, or APC against surface markers characteristic of MSCs (CD90, CD105, CD73, CD13, HLA-I, HLA-II, CD45, CD31, CD34, CD14, and CD54/ICAM-1 (BD Biosciences, San Diego, CA)) were used for immunophenotypic characterizations, as described in Flow Cytometry Analysis of Cells.
Adipogenic and osteogenic differentiation was induced with Stem Cell Kits (Stemcell Technologies, Inc., Vancouver, BC, Canada). Adipogenic differentiation was determined by visualizing the presence of Oil Red O-stained lipid vacuoles (Sigma-Aldrich, St. Louis, MO). Osteogenic differentiation was determined by alkaline phosphatase activity which was detected using SIGMAFAST™ BCIP/NBT (Sigma-Aldrich). Chondrogenic differentiation was induced with a commercial induction medium supplemented with 10 ng/mL of TGF-β (both reagents of Cambrex Bio Science). The resulting micromasses were fixed, dehydrated, embedded in paraffin, and sliced. Cross sections of 5 μm were stained with Alcian blue dye (Sigma-Aldrich).
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