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33 protocols using ve cadherin

1

Multiparametric Flow Cytometry and IHC Assays

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The following antibodies were used for flow cytometry and immunohistochemistry analysis: CD31 (BD Bioscience, #553371; DSHB, 2H8), CD34-FITC (eBiosciences, #11-0341), Ter119-PE (BD Biosciences, #553673), Runx1 (Abcam, ab92336), c-kit-FITC (eBiosciences, #11-1171), CSF1R (Abcam, #Ab32633; eBioscience AFS98), and VE-Cadherin (R&D, #AF1002). Alexa-Fluor tagged secondary antibodies (Invitrogen) were used for all non-conjugated primary antibodies with the exception of anti-Armenian Hamster secondary (AlexaFluor647, Abcam).
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2

Aortic Ring Sprouting Assay for Angiogenesis

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The aortic ring sprouting assay was performed as previously (20 (link)). Briefly, aortas were harvested from 8 to 10 weeks old mice and washed with DMEM/F14 medium (Gibco, Carlsbad, USA) supplemented with 100 U/mL penicillin, and 100 μg/mL streptomycin. The dissected aortas were subsequently cleaned, sectioned in 12–16 rings of 1 mm length, and embedded in collagen type 1 (Corning, New York, USA). After polymerization of the collagen gel, microvascular endothelial cell growth medium (PeloBiotech, Planegg, Germany) supplemented with 100 U/mL penicillin, 100 μg/mL streptomycin, and 2% murine serum (BD) was added into the well. Tube-like structures were allowed to develop over 7 days. Thereafter, samples were fixed in 4% PFA and endothelial cells were visualized using antibodies against CD31 (Dianova, Hamburg, Germany) and VE-Cadherin (R&D), while NG2 (Merck, Darmstadt, USA) staining was employed to detect pericytes. The total volume of vascular and perivascular sprouting in each explant was calculated trough the IMARIS-BITPLANE 9.3 software. Additionally, total sprout length was measured with ImageJ.
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3

Immunostaining of Cell Cultures on Scaffolds

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Cells on the scaffolds were fixed on day 7 with 4% paraformaldehyde (PFA) in PBS (Affymetrix, Cleveland, OH, USA) for 15 min and permeabilized with 0.05% Triton®X-100 (in PBS, Sigma-Aldrich, Taufkirchen, Germany) for 10 min. For MSCs mono-cultures, cells were stained with Phalloidin-TRITC (1:100 in PBS, Sigma-Aldrich) for 30 min and then Höchst (2 µg/mL in PBS, Sigma-Aldrich) for 10 min. The co-cultures were incubated with VE-Cadherin (R&D, Minneapolis, MN, USA) antibodies (1:50 diluted in PBS with 1% bovine serum albumin (BSA)) for 2 h. After being washed three times with PBS, the cells were incubated with the secondary antibody (1:1000 in 1% BSA) and Phalloidin-TRITC (1:100) for 45 min, followed by 10 min incubation with Höchst (2 µg/mL in PBS). The immuno-stained samples were kept in PBS for visualization with confocal laser scanning microscope (CLSM, LSM 800, Zeiss, Germany) affiliated with ZEN image system.
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4

Immunofluorescence Antibody Labeling Protocol

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Antibodies used for cell or embryo immunofluorescence were used at a dilution of 1/100 unless otherwise specified. Antibodies were raised against Isl1 (Developmental Hybridoma bank, Iowa University 1/50), Tbx20 (novus biological H00057057-B01), Msx1 (Abcam ab93287), Tbx3 (Santa Cruz sc-178721), aggrecan (Chemicon AB1031), versican (Chemicon AB1033), smooth muscle actin (Sigma A-2547), Filamin A (Epitomics, CA, USA), vimentin dylight 550 (Novus biological, VM452, 1/200), periostin (Abcam ab140141), CD31 (BD pharmigen, WM59), VE-cadherin (R&D systems/MAB9381), Sox9 (a gift from Pr Wegner, University of Nurnberg, and Santa-Cruz Sc17431), GATA5 (Abcam ab11877), Hyaluronan-binding protein (Millipore 385911), collagen I (Abcam 34710), anti-Patched1 (Merck-Millipore, France, 06–1102), human Lamin A/C (Novacastra, NCL-LAM-A/C), and anti-NFATc (Santa-Cruz 17844 H10).
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5

Endothelial Cell Protein Expression Analysis

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We observed CAR and endothelial cell-to-cell junctional protein expression level; protein was extracted from both WT and KO endothelial cells. Immunoblot analysis used an ECL detection system as described previously [24 (link)]. Primary antibodies were used; anti-CAR (Santa Cruz Biotechnologies, Dallas, TX, USA), PECAM-1, VE-cadherin (R&D system, Minneapolis, MN, USA), FLK-1 (Sigma-Aldrich, Inc. St. Louis, MO, USA), integrin-β1D (Zymed Laboratories, Inc. South San Francisco, CA, USA), and GAPDH (Santa Cruz Biotechnologies, Dallas, TX, USA). Protein expression levels were evaluated with Image Lab software (Bio-Rad laboratories, Hercules, CA, USA) based on the signal intensity of each protein using GAPDH as an internal control for protein loading.
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6

Immunostaining of Cultured Endothelial Cells

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Cultured endothelial cells were fixed with ice-cold butanol for 15 min at room temperature, followed by blocking and permeabilization with 2% BSA and 1% Triton X-100 in PBS and incubated with primary antibodies against CAR (1:100; Santa Cruz, Dallas, TX, USA), VE-cadherin, and PECAM-1 (1:500; R&D system, Minneapolis, MN, USA). The target proteins were visualized with the secondary antibodies conjugated with fluorescence (Alexa fluor 488 and 594, 1:400; Invitrogen, South San Francisco, CA, USA) and Hoechst nuclear stain. Fluorescence images were taken and processed using a fluorescent microscope (Olympus, Waltham, MA, USA) [23 (link)].
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7

Western Blot Analysis of Endothelial Cell Signaling

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Western blot analyses were performed on lysis of HLMVEC exposed to cytomix with or without treatment with MSCs or MSC MVs as previously described 16 using antibody for phosphorylated myosin light chain 2 (1:1,000 dilution, Cell Signaling), VE‐cadherin (1 μg/ml, R&D Systems), ZO‐1 (1:1,000, Cell Signaling) and β‐actin (R&D Systems) or glyceraldehyde 3‐phosphate dehydrogenase (GAPDH) (1:1,000, Cell Signaling) as loading controls. GTP‐bound Rac1/2/3 were measured in protein lysates of HLMVECs with a commercially available activation kit (G‐LISA, kit #BK125, Cytoskeleton, Inc., Denver, CO, http://www.cytoskeleton.com/) according to the manufacturer's instructions.
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8

Aortic Ring Assay for Angiogenesis

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The aortic ring assay was performed as described previously [43 (link)]. Three ApoE3*Leiden mice, 4–8 weeks old, were anesthetized and the aorta was dissected. Each aorta was cut in 1 mm rings, and serum-starved in Gibco™ Opti-MEM™ GlutaMAX (51985034, ThermoFisherScientific) overnight at 37 °C and 5% CO2. On the next day, each ring was mounted in a well of a 96-well plate in 70 µL of 1.0 mg/mL acid-solubilized collagen type-I (11179179001, Roche Diagnostics) in DMEM (12634010, ThermoFisher Scientific). After collagen polymerization, Gibco™ Opti-MEM™ GlutaMAX supplemented with 2.5% FCS and 30 ng/mL VEGF (recombinant mouse VEGF-164) was added with PC-mAb (10 µg/mL and 100 µg/mL). The rings were cultured for 7 days and photographed using Axiovert 40c microscope. The number of sprouts were counted manually. For immunohistochemistry, rings were formalin-fixed and permeabilized with 0.2% Triton X-100 (11332481001, Merck). Rings were stained with ACTA2, CD31 and VE-Cadherin (AF1002, R&D Systems). Extended focus pictures were made with the Pannoramic SCAN II and quantified with Image J.
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9

Whole-Mount Retinal Immunostaining Protocol

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Retinas for whole-mount were fixed in 4% PFA for 2 hours at room temperature, or overnight at 4 °C. After fixation, retinas were blocked and permeabilized in blocking buffer (1% BSA and 0.5% Triton X-100 in PBS) overnight at 4°C. For mouse antibodies, samples were washed and blocked with mouse IgG blocking reagent as suggested by the manufacturer (MKB-2213 Vector, CA, USA) for 1 hour at room temperature. Primary antibodies were diluted in blocking buffer and incubated overnight at 4°C. The following antibodies were used: VE-cadherin (1:200, AF1002 R&D systems, Abingdon, UK), α-smooth muscle actin-cy3 (1:500, C6198 Sigma, Taufkirchen, Germany), N-cadherin (1:200, 33-3900 lifetechnologies, CA, USA), collagen IV (1:500, 1340-01 southern biotech, AL, USA), presenilin 1 (1:200, MAB1563 Millipore, Darmstadt, Germany) and desmin (1:500, ab15200 abcam, Cambridge, UK). For secondary detection Alexa Fluor-coupled secondary antibodies (1:200) were used. Cell nuclei were visualized with DAPI (0.2 ug/mL, D9542 Sigma). After antibody staining retinas were post-fixed with 4% PFA for 10 minutes before flat-mounting in mounting medium (Dako).
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10

Quantification of Angiogenic Factors

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Antibodies for PD-1, PD-L1 (B7-H1), Ly6G, ICAM-1, CD31, VE-Cadherin and MIP-2 were obtained from R&D Systems, Minneapolis, MN; anti-CD31 ELISA kit and mouse CBA cytokine assay kit (IL-6, TNF-α, MCP-1) from BD Bioscience, San Diego, CA; and Ang-1 and Ang-2 cytokine assay kits from Life Sciences Advanced Technologies, St. Petersburg, FL. Tie2 and phosphorylated Tie2 ELISA kits purchased from R&D Systems, Minneapolis, MN. All other chemicals were analytical reagent grade.
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