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3 protocols using rb pab

1

Immunocytochemistry and CLSM Analysis

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Immunocytochemistry and CLSM were performed as previously described [74 (link),75 (link)]. Cells were cultured on 12 mm round coverslips coated with poly-D-Lysine/Laminin (BD Bioscience, Franklin Lakes, NJ). Cells were fixed with 4% paraformaldehyde for 20 min, then permeabilized with 0.1% Triton X-100 in PBS for 10 min. Cells were incubated in a blocking buffer containing 1% bovine serum albumin (for MZF1 and SCAND2) or, alternatively, 3% normal goat serum (for SCAND1) in PBS for 30 min, incubated with primary antibodies at 4 °C overnight and then with secondary antibodies at RT for 1 h in the blocking buffer. Cells were washed thrice with PBS for 5 min between the steps. Cells were mounted within ProLong Gold Antifade Mountant (Thermo Fisher Scientific). Fluorescence images were acquired using Axio Vision CLSM (Zeiss, Oberkochen, Germany) with an AxioCam MR3 (Zeiss) camera for SCAND1, and alternatively, FSX100 inverted microscope (Olympus, Tokyo, Japan) for MZF1 and SCAND2. We used antibodies against MZF1 (C10502, Rb pAb, Assay Biotechnology, Fremont, CA), SCAND1 (ab64828, Rb pAb, Abcam), SCAND2 (5F1, H00054581-M02, Ms mAb, Thermo Fisher Scientific), and anti-rabbit IgG conjugated with Alexa Fluor 488 (Thermo Fisher Scientific).
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2

Silencing CDC42 in Endothelial Cells

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For silencing CDC42, sixty percent confluent HUVECs were transfected for 6 h with 20nM CDC42 siRNA (Hs_CDC42_7 FlexiTube siRNA, Qiagen) or Scrambled, in a solution of Lipofectamine RNAiMAX (invitrogen) according to manufacturer’s instructions. Expression levels of CDC42 were assessed by Real time PCR (qScript cDNA SuperMix, Quanta Bioscience for cDNA synthesis, and QuantiTect SYBR Green PCR Kit, Qiagen for PCR reaction) and by antibody staining (mouse anti-CDC42, Clone 44, BD Biosciences). GAPDH primers used: Fw (5′-3′) GTCTCCTCTGACTTCAACAGCG and Rv (3′-5′) ACCACCCTGTTGCTGTAGCCAA). Human CDC42 primers used: Fw (5′-3′) TGACAGATTACGACCGCTGAGTT and Rv (3′-5′) GGAGTCTTTGGACAGTGGTGAG). Channels within molds were seeded with transfected HUVECs and either left in culture for apoptosis and sprouting assay, or implanted in vivo in a model of hind limb ischaemia. Active caspase 3 (Rb pAb, Abcam ) staining was used to determine the percentage of apoptotic cells within channels. The growth of angiogenic sprouts from patterned vessels was tested after a four day culture in fibroblast conditioned media-EGM2 medium (1:1), followed by fixation in 4% PFA for 30 min and phalloidin (Invitrogen) staining for 1h.
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3

Silencing CDC42 in Endothelial Cells

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For silencing CDC42, sixty percent confluent HUVECs were transfected for 6 h with 20nM CDC42 siRNA (Hs_CDC42_7 FlexiTube siRNA, Qiagen) or Scrambled, in a solution of Lipofectamine RNAiMAX (invitrogen) according to manufacturer’s instructions. Expression levels of CDC42 were assessed by Real time PCR (qScript cDNA SuperMix, Quanta Bioscience for cDNA synthesis, and QuantiTect SYBR Green PCR Kit, Qiagen for PCR reaction) and by antibody staining (mouse anti-CDC42, Clone 44, BD Biosciences). GAPDH primers used: Fw (5′-3′) GTCTCCTCTGACTTCAACAGCG and Rv (3′-5′) ACCACCCTGTTGCTGTAGCCAA). Human CDC42 primers used: Fw (5′-3′) TGACAGATTACGACCGCTGAGTT and Rv (3′-5′) GGAGTCTTTGGACAGTGGTGAG). Channels within molds were seeded with transfected HUVECs and either left in culture for apoptosis and sprouting assay, or implanted in vivo in a model of hind limb ischaemia. Active caspase 3 (Rb pAb, Abcam ) staining was used to determine the percentage of apoptotic cells within channels. The growth of angiogenic sprouts from patterned vessels was tested after a four day culture in fibroblast conditioned media-EGM2 medium (1:1), followed by fixation in 4% PFA for 30 min and phalloidin (Invitrogen) staining for 1h.
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