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5 protocols using sc 376403

1

Protein Expression Analysis of Angiogenic Factors

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Proteins were extracted from cells cultured in RIPA lysis buffer (RIPA, China) as described in the RT-PCR protocol. One SDS-PAGE gel was loaded with 50μg of protein per well. After the proteins were transferred on nitrocellulose membranes, antibodies specific for Dll4 (1:200, SC365429, Santa Cruz, CA), Notch1 (1:200, SC376403, Santa Cruz, CA), Notch4 (1:200, SC393893, Santa Cruz, CA) and the VEGF (1:200, SC365578, Santa Cruz, CA) were used for incubation. Band intensity was analyzed with a gel imaging analysis system (Image Lab, Bio-Rad, USA).
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2

Immunohistochemical Analysis of CD24 and Notch1

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Tumor samples were formalin-fixed and embedded in paraffin. Paraffin sections were stained with the first antibody for CD24 (1:200; sc-7034) and Notch1 (1:200; sc-376403) (Santa Cruz Biotechnology) by incubating overnight at 4°C. Secondary staining with biotinylated secondary antibodies with horseradish peroxidase (HRP; Beyotime Biotechnology, Nanjing, People’s Republic of China) was performed for 30 min at room temperature. Then, the sections were counterstained with hematoxylin (Beyotime).
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3

Extracellular Vesicle Protein Profiling

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Extracellular vesicles or C-MSCs were lyzed with radio immunoprecipitation assay (RIPA) buffer supplemented with Complete Protease Inhibitor Mixture tablets (Roche Diagnostics). The cell lysate was sonicated in ice using a sonication device (Sonic dismembrator Model100, Fisher Scientific). Five micrograms of protein of EVs or 10 μg protein of cells was separated by SDS/PAGE and transferred to PVDF membrane (BioRad). Membranes were incubated with rabbit anti-CD63 antibody (EXOAB-CD63A-1, SBI System Biosciences), mouse anti-Tsg101 antibody (sc-7964, Santa Cruz), mouse anti-calnexin antibody (sc-23954, Santa Cruz), anti-N1ICD antibody (sc-376403, Santa Cruz), or anti-GADPH antibody (sc-32233, Santa Cruz) overnight at 4°C followed by incubation with an anti-mouse or anti-rabbit goat peroxidase conjugated secondary antibody. Immunoreactive bands were visualized by the enhanced chemiluminescence method (Bio-Rad) with a western blotting detection system (Fluorchem E, ProteinSimple, United States).
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4

Immunohistochemical Analysis of Vascular and Immune Markers

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Mouse monoclonal antibodies against CD31 (1:100; M0823; Dako), Notch-1 (1:50; sc-376403; Santa Cruz; CA, USA), SOX18 (1:100; sc-166025; Santa Cruz,) and CD45 (1:100; M070129-2; Dako) and rabbit polyclonal antibodies against CD68 (HPA_048982; 1:3000; Sigma) were used.
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5

Western Blot Analysis of Cellular Signaling

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Cells were lysed for 30 min in RIPA buffer supplemented with protease (Sigma-Aldrich, St. Louis, MO, USA) and phosphatase (PhosSTOP; Roche, Basel, Switzerland) inhibitor cocktails. Equal protein amounts of cell lysate were loaded on a 10% sodium dodecyl sulphate-polyacrylamide gel electrophoresis (SDS-PAGE) gel, moved to polyvinylidene difluoride membranes and blocked with 5% skim milk in PBS/0.05% Tween 20 for 1 h. Primary antibodies for GAPDH (LF-PA0212, Abfrontier, Seoul, Korea), TCF4 (TCF7L2) (sc-13027, Santa Cruz Biotechnology, Dallas, TX, USA), β-catenin (ab325572, Abcam, Cambridge, MA, USA), cyclin dependent kinase 1 (CDK1) (ab131450, Abcam, Cambridge, MA, USA), cyclin D1 (sc-718, Santa Cruz Biotechnology, Dallas, TX, USA), SIRT1 (sc-15404, Santa Cruz Biotechnology), extracellular signal-regulated protein kinases 1 and 2 (ERK1/2) (ab17942, Abcam), phospho-ERK1/2 (pERK1/2) (ab4819, Abcam), glycogen synthase kinase 3 beta (GSK3β, ab32391, Abcam), caspase-3 (sc-7148, Santa Cruz Biotechnology), notch1 (sc-376403, Santa Cruz Biotechnology), and Hes1 (sc-166410, Santa Cruz Biotechnology) were used. The immunoreactive bands were viewed using horseradish peroxidase-conjugated secondary antibodies (Bio-rad) and a WEST-Queen™ RTS Western Blot Detection Kit (iNtRON Biotechnology, Seongnam, Korea) and densitometric analysis was performed.
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