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5 protocols using myod c 20

1

Immunofluorescence Staining of Myogenic Cells

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Myofibers were fixed in 4% paraformaldehyde (PFA) in PBS and 1% glycine and blocked in PBS containing 0.2% Triton X-100 (BioShop), 2% BSA, 5% goat serum (Cedarlane), and 1% azide. Myoblasts were fixed in 2% PFA in PBS and blocked in PBS containing 0.3% Triton X-100 and 10% goat serum. Cryosections were thawed at room temperature, fixed in 4% PFA, and processed for antigen retrieval in citrate buffer at 95 °C for 20 min. The sections were permeabilized with PBS containing 0.5% Triton X-100 and blocked in PBS containing 0.1% Triton X-100 and 5% donkey serum (Cedarlane) prior to incubation with primary antibody overnight at 4 °C. The cells were washed with PBS and incubated in biotin anti-mouse (when indicated) or secondary antibodies conjugated to a fluorescent dye (Cy3, Alexa 488, or Alexa Flour 647; all from Jackson ImmunoResearch). Nuclei were counterstained with DAPI (0.5 μg/ml). The primary antibodies used were as follows: Pax7-c (DSHB), MYH (H-300; Santa Cruz), MyoD (C-20; Santa Cruz), myogenin (M-225; Santa Cruz), C/EBPβ (E299; Abcam), and laminin (AL-4; Millipore).
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2

Nuclear Extraction and DNA-Protein Binding Assays

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Nuclear extracts were prepared from the various cell lines using the CellLytic NuCLEAR extraction kit (Sigma-Aldrich, St. Louis, MO). Protein concentration was measured with a Bio-Rad protein assay (Hercules, CA), and samples were stored at −70°C until use. Double-stranded DNA oligonucleotide probes corresponding to the predicted TF binding sites of KIR ProI region were synthesized (Figures 2, 3, 5). Labeling and DNA-protein binding reactions were performed as previous described9 (link). For antibody supershift experiments, nuclear extracts were incubated with 2 µL of antibody for 1 h on ice before the addition of 32P-labeled DNA probe. After the addition of labeled DNA probe, the binding reaction was incubated for an additional 20 min at room temperature. The antibodies used were cFos (6-2H-2F), FosB (102), cJun (H-79), JunB (C-11), JunD (329), Fra-2 (Q-20), ATF-1 (FI-1), Ets-1 (C-4), Elf-1 (C-20), Oct-1 (E-8, C-21 and 12F11), Oct-3/4 (C-10), Oct-2 (C-20), CREB-1 (24H4B), C/EBPα (D-5), C/EBPβ (H-7), C/EBPγ (H-50), SP-1 (E-3), IRF-1 (C-20), IRF-3 (SL-12), ICSBP (C-19), PU.1 (A-7), E4BP4 (B-1), and MyoD (C-20) from Santa Cruz Biotechnology, Inc. (Dallas, TX, USA) at gel shift grade (200 µg/0.1µl)
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3

Smooth Muscle Differentiation of hUSCs

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hUSCs were plated at 2000 cells/cm2 in smooth muscle differentiation media containing equal amounts of high-glucose DMEM and embryonic fibroblast medium (EFM) with 10% FBS, 2.5 ng/mL of transforming growth factor beta1 (TGF-β1), and 5 ng/mL of platelet-derived growth factor BB (PDGF-BB) (R&D Systems, Minneapolis, MN). Cell morphology was recorded before and after growth factor additions for up to 14 days. The slides were fixed with freshly prepared 4% paraformaldehyde for 20 min followed by permeabilization with 0.1% Triton-X100 in PBS for 10 min and blocked with serum-free block solution (Dako, Denmark) for 15 min. Lineage-specific primary antibodies, rabbit polyclonal antibodies to desmin (abcam, Cambridge, MA; catalog number ab15200) and MyoD (C-20, Santa Cruz Biotechnology, Inc., Dallas, TX; catalog number sc-304), were incubated at 4°C overnight followed by secondary antibody conjugated to Alexa Fluor 594 (Life Technologies, Grand Island, NY; catalog number A11072) for 30 min in the dark. The slides were mounted using anti-fade mounting media (Vector Laboratories, Inc., Burlingame, CA) containing propidium iodide (PI) and images were captured using a Leica upright microscope (DM 4000B, Wetzlar, Germany).
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4

Immunohistochemistry for Skeletal Muscle

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Mouse anti-human nuclei (1:50) (Millipore MAB1281), Pax7 (1:500), Pax3 (1:500), Myogenin (1:500) (Developmental Studies Hybridoma Bank), Laminin (C-20) (1:200) (Sigma), Laminin (1:400) (Abcam), MyoD (C-20) (1:100), Desmin (RD301) (1:50), and GFP (FL) (1:50) (Santa Cruz).
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5

Nuclear Extraction and DNA-Protein Binding Assays

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Nuclear extracts were prepared from the various cell lines using the CellLytic NuCLEAR extraction kit (Sigma-Aldrich, St. Louis, MO). Protein concentration was measured with a Bio-Rad protein assay (Hercules, CA), and samples were stored at −70°C until use. Double-stranded DNA oligonucleotide probes corresponding to the predicted TF binding sites of KIR ProI region were synthesized (Figures 2, 3, 5). Labeling and DNA-protein binding reactions were performed as previous described9 (link). For antibody supershift experiments, nuclear extracts were incubated with 2 µL of antibody for 1 h on ice before the addition of 32P-labeled DNA probe. After the addition of labeled DNA probe, the binding reaction was incubated for an additional 20 min at room temperature. The antibodies used were cFos (6-2H-2F), FosB (102), cJun (H-79), JunB (C-11), JunD (329), Fra-2 (Q-20), ATF-1 (FI-1), Ets-1 (C-4), Elf-1 (C-20), Oct-1 (E-8, C-21 and 12F11), Oct-3/4 (C-10), Oct-2 (C-20), CREB-1 (24H4B), C/EBPα (D-5), C/EBPβ (H-7), C/EBPγ (H-50), SP-1 (E-3), IRF-1 (C-20), IRF-3 (SL-12), ICSBP (C-19), PU.1 (A-7), E4BP4 (B-1), and MyoD (C-20) from Santa Cruz Biotechnology, Inc. (Dallas, TX, USA) at gel shift grade (200 µg/0.1µl)
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