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5 protocols using fitc conjugated anti mouse iga

1

CSR Efficiency Assay in CH12F3 Cells

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CH12F3 cells were cultured in RPMI1640 medium supplemented with 10% fetal bovine serum and 50 μM of beta-mercaptoethanol. For CSR assay, healthy CH12F3 cells were seeded at 5 × 104 cells/ml in the presence of 1 μg/ml anti-CD40 (eBioscience 16-0402-86), 5 ng/ml of IL-4 (R&D Systems 404-ML), and 0.5 ng/ml TGF-β1 (R&D Systems 240-B) and grown for 72 hr. Cells were stained with a FITC-conjugated anti-mouse IgA (BD Biosciences 559354) and analyzed on a LSR II flow cytometer (BD Biosciences). CSR efficiency is determined as the percentage of IgA-positive cells.
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2

Immunoblotting analysis of DNA repair proteins

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Whole cell lysis and immunoblotting were performed as described63 (link),68 (link). Antibodies against FANCM and FAAP24, and antibody against BRCA2 were kindly provided by Dr. Weidong Wang38 (link) and Dr. Jun Huang66 (link), respectively. Antibodies against Mre11 and CtIP were used previously10 (link),63 (link),69 (link). Commercial antibodies used were: Anti-FANCA (Bethyl Laboratories A301-980A,1:1000), anti-FANCD2 (Bethyl Laboratories A302-174A, 1:1000), anti-MHF1 (Abcam, ab169385, 1:1000), anti-Rad51 (Santa Cruz Biotechnology, sc-398587, 1:500), anti-H2AX-S139p (Cell Signaling, #2577, 1:1000), anti-H2A (Cell signaling, #2578, 1:1000), anti-FLAG (Sigma, F1804, 1:2000), anti-Rad52 (Santa Cruz Biotechnology, sc-365341, 1:1000), anti-Ras (Santa Cruz Biotechnology, sc-520, 1:1000), anti-β-actin (Sigma, A5441, 1:2000), anti-Chk1 (Santa Cruz Biotechnology, sc-8408, 1:500), anti-Chk1-S345p (Cell Signaling,#2348, 1:500), anti-RPA32 (Bethyl Laboratories A300-244A, 1:1000), BRCA1 (Bethyl Laboratories, A300–000A, 1:500) and FITC-conjugated anti-mouse IgA (BD, 559354).
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3

Assessing Nasal Immunoglobulin A Response

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The areas around the nasal tissues were excised at 7 d after the immunization, perfused in 4% paraformaldehyde, dehydrated in 10%, 20%, and 30% sucrose solutions, and then frozen sectioned (20 µm) for FITC‐conjugated antimouse IgA (BD Biosciences) counter staining and H&E staining. Frozen sections from immunized mice were subjected to a blocking step with 1% BSA and were stained with FITC‐conjugated antimouse IgA antibody. The sections were then counterstained with DAPI and analyzed using confocal microscopy (LSM 710 Meta, Carl Zeiss, Germany). For H&E staining, the sectioned nasal tissues were stained with H&E for the nucleus and cytoplasm. The stained sections were captured using slide scanner (APERIO CS2, Leica Biosystems, Germany).
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4

Visualizing Intestinal IgA-Bacteria Interactions

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E. coli HA107 was cultured without shaking at 37°C for overnight. The bacteria were then washed in PBS and resuspended at 107 per ml. Portions (50 μl) of the bacterial suspension were dropped onto glass slides and the bacterial drop was encircled using a wax pen. Bacteria were allowed to sediment onto the glass slides and to dry. Transiently flamed bacteria on glass slides were stained with intestinal wash prepared from small intestine of HA107 conditioned germ-free C57BL/6 mice. The IgA antibodies bound to bacteria were visualized with FITC-conjugated anti-mouse IgA (BD Bioscience). DAPI (4’, 6-diamidino-2-phenylindole) was used to counterstain the bacterial DNA. Immunofluorescent pictures were taken using Flash Slide Scanner (PerkinElmer) with 40 magnifications.
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5

CSR Efficiency Assay in CH12F3 Cells

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CH12F3 cells were cultured in RPMI1640 medium supplemented with 10% fetal bovine serum and 50 μM of beta-mercaptoethanol. For CSR assay, healthy CH12F3 cells were seeded at 5 × 104 cells/ml in the presence of 1 μg/ml anti-CD40 (eBioscience 16-0402-86), 5 ng/ml of IL-4 (R&D Systems 404-ML), and 0.5 ng/ml TGF-β1 (R&D Systems 240-B) and grown for 72 hr. Cells were stained with a FITC-conjugated anti-mouse IgA (BD Biosciences 559354) and analyzed on a LSR II flow cytometer (BD Biosciences). CSR efficiency is determined as the percentage of IgA-positive cells.
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