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6 protocols using anti pax5

1

Histone Modifications and Chromatin Interactions

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Rabbit polyclonal to H1, HMGN1, HMGN2, and H3 were from our laboratory, anti H3K27ac (Abcam#ab4729), anti H3K27me3 (Abcam#ab6002), monoclonal anti H1(Milipore-Sigma #05-457), anti CEBPB (Abcam#ab32358), Anti-Brd3 (Active Motif #61489), Anti-Brd4 (Bethyl Laboratories #A301-985A100), Anti-CEBPB (Abcam #ab32358), Anti-CTCF (EMD Millipore #07-729), Anti-Ets1 (Active Motif #39580), Anti-Ikaros (Active Motif #39355), Anti-Irf8 (Bethyl Laboratories #A304-027A), Anti-Klf4 (Abcam #106629), Anti-Nanog (Active Motif #61419), Anti-Oct4 (Abcam #ab19857), Anti-p300 (Active Motif #61401), Anti-Pax5 (Abcam #183575), Anti-Sox2 (Abcam #97959).
The following recombinant mononucleosomes were purchased from Active Motif: unmodified (#81070); H3K27me3 modified (#81834), H3K27ac modified (#81077).
Wild type and HMGN DKO mouse embryonic fibroblasts, embryonic stem cell lines55 (link) and resting B cells56 (link) were as previously described. Peptides Histone H3 (23–34) peptide, KAARKSAPATGG and Histone H3K27ac (23–34) peptide, KAAR - K(Ac)—SAPATGG were from AnaSpec, Inc.
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2

Immunohistochemical Analysis of Lymph Nodes

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Lymph nodes were fixed in 10% neutral-buffered formalin and embedded in paraffin. Tissue sections were typically 4-μm thick and were examined after staining with hematoxylin and eosin (H&E). For immunohistochemistry, the sections were first boiled in a citrate-based solution to retrieve antigens and subsequently quenched in 3% hydrogen peroxide. The antibodies used included anti-FOXP3 (Cat. MAB8214, R&D systems, Minneapolis, MN), anti-PD-1 (Cat. AF1021, R&D systems), anti-CD3 (Cat. ab5690, Abcam, Cambridge, MA), anti-PAX5 (Cat. sc-1974, Santa Cruz Biotechnology, Dallas, TX), anti-CD4 (Cat. 14–0042, eBioscience, San Diego, CA), anti-CD8 (Cat. 14–0081, eBioscience), anti-CD21 (Cat. Ab75985, Abcam), MECA79 (Cat. 53–6036-80, eBioscience) and anti-HA (Cat. 3724, Cell Signaling Technology) antibodies. After biotinylated secondary antibody treatment, visualization was carried out with Vectastain ABC-HRP kit (Vector Laboratories, Burlingame, CA) or ABC-AP kit (Vector Laboratories) in combination with DAB or with VectorRed (Vector Laboratories) respectively.
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3

Multimodal Immunohistochemical Analysis of Lymph Nodes

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Lymph nodes were fixed in 10% neutral buffered formalin and embedded in paraffin. Sections were typically four μm thick and stained with hematoxylin and eosin (H&E). For immunohistochemistry, sections were boiled in citrate-based solution to retrieve antigens and subsequently quenched in 3% hydrogen peroxide. Antibodies used included anti-CD21 (Cat. ab75985, Abcam, Cambridge, MA, USA), MECA79 (Cat. 53-6036-80, eBioscience, San Diego, CA, USA), anti-PD-1 (Cat. AF1021, R&D systems, Minneapolis, MN, USA), anti-CD3 (Cat. ab5690, Abcam), anti-PAX5 (Cat. sc-1974, Santa Cruz Biotechnology, Dallas, TX, USA), anti-CD4 (Cat. 14–0042, eBioscience), anti-CD8 (Cat. 14–0081, eBioscience), anti-CD138 (Cat. AF3190, R&D Systems) and anti-HA (Cat. 3724, Cell Signaling Technology). Horseradish peroxidase-coupled secondary antibodies (Vector Laboratories, Burlingame, CA, USA) were used in combination with DAB for visualization. For immunofluorescence staining, sections were stained with Alexa Fluor 488 conjugated anti-GL7 (Cat. 144611, BioLegend, San Diego, CA, USA) and anti-CD4 (Cat. 14–0042, eBioscience). Secondary antibody for anti-CD4 was goat anti-Rat IgG (H + L) Alexa Fluor 594 (Cat. A11007, Invitrogen, Carlsbad, CA, USA).
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4

Histological Analysis of Tissue Samples

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All tissues were fixed in formalin, embedded in paraffin, sectioned at 4 μm, mounted on slides (Superfrost Plus; Thermo Fisher Scientific), and dried at 60°C for 20 min before dewaxing and staining with hematoxylin and eosin (H&E) using standard methods. For immunohistochemical staining, the primary antibodies used in this study included anti-B220 (BD Biosciences) and anti-PAX5 (Abcam). Sections underwent antigen retrieval in a prediluted Cell Conditioning Solution (CC1) (Ventana Medical Systems) for 32 min, and the OmniMap anti-Rabbit HRP kit (Ventana Medical Systems) and ChromoMap DAB (Ventana Medical Systems) were used for detection. Sections were examined by a pathologist blinded to the experimental group assignments.
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5

Immunoblotting Assay for Protein Analysis

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For immunoblotting, 1.5 × 106 cells per sample were harvested and lysed in 50 μl modified RIPA buffer (50 mM TrisHCl, pH 7.4, 1% NP-40, 0.25% sodium deoxycholate, 150 mM NaCl, 1 mM EDTA (pH 8), 1 mM sodium orthovanadate, 1 mM NaF and protease inhibitor cocktail (Sigma-Aldrich)). Lysates were separated on 10% SDS-polyacrylamide gels and transferred to PVDF membranes (Millipore). Membranes were blocked with 5% dry milk in PBT (PBS, 0.1% Tween-20) for 1 h at room temperature with constant agitation. Primary antibodies were diluted in PBT supplemented with 4% BSA fraction V (BIOMOL Research Laboratories). Secondary antibodies were diluted in blocking solution. Immunoreactive antibodies used were anti-Pax5 (Abcam), anti-FoxO1 (Cell Signaling Technologies), and anti-Actin (I-19, Santa Cruz Biotechnology).
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6

ChIP Profiling of PAX5 Mutants

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ChIP was performed on 697 parental, 697-PAX5 P80R/Fs, 697-PAX5 WT/Fs, and 697-PAX5 WT/WT using ChIP-IT High Sensitivity Kit (Active Motif, 53040) according to the manufacturer’s protocol. A total of 2 × 106 cells were fixed with complete cell fixation solution for 15 min and then stopped by stop solution for 5 min, followed by sonication. Both buffers were provided by the ChIP-IT High Sensitivity Kit. The following antibodies were used for ChIP assays: anti-PAX5 (Abcam, ab15164), anti-H3K27Ac [Cell Signaling Technology (CST), 8173S], and anti-H3K4me3 (CST, 9751). Normal rabbit immunoglobulin G (CST, 2729) was used for control ChIP. Primers for ChIP-qPCR analysis are shown in table S5.
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