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3 protocols using adult c57b 6 mice

1

Isolation and Activation of Murine B Cells

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Adult C57/B6 mice were purchased from The Jackson Laboratory and maintained in a specific pathogen–free facility at the University of California, San Diego. Mice were analyzed at 8 weeks of age. Both male and female mice were used for analysis. Animal studies (S00031) were approved by the Institutional Animal Care and Use Committee. Splenocytes were incubated with CD23-biotin (eBioscience, clone B3B4) and purified using anti-biotin microbeads (Miltenyi Biotec). Sorted B cells were cultured for up to 3 days in RPMI 1640 medium supplemented with 10% fetal bovine serum (FBS), antibiotics, 2 mM l-glutamine, and 50 μM β-mercaptoethanol at 37°C and 5% CO2. LPS (Escherichia coli, Sigma-Aldrich, L2654) was used at 10 μg/ml for B cell activation.
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2

Ultrastructural Analysis of WFA-Labeled Neurons

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Adult C57B/6 mice (Jackson Labs) were transcardially perfused with 4% PFA and 0.5% glutaraldehyde (EMS) in 100 mM phosphate buffer (PB). Brains were post-fixed at 4°C overnight, and 50 μm coronal sections were cut on a Leica VT1000 S vibratome. Pre-embedding IHC was performed using WFA (Sigma L1516), amplified with Vectastain Elite ABC kit (Vector Laboratories), and developed with DAB23 (link). Sections were postfixed in 1% osmium tetroxide for 30 min and then embedded in Durcupan ACM epoxy resin (Fluka, Sigma-Aldrich)51 . For reconstruction of WFA-labeled neurons, we cut ~200 serial semithin (1.5 μm) sections on an Ultracut UC-6 ultramictrotome. Selected semithin sections were glued to resin blocks and detached from glass slides by repeated freeze-thaw. Ultrathin sections (60–80 nm) were then cut and placed on Formvar-coated single-slot grids, stained with lead citrate, and examined at 80 kV on a FEI Tecnai G2 Spirit transmission electron microscope equipped with a Morada CCD digital camera (Olympus).
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3

Ultrastructural Analysis of WFA-Labeled Neurons

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Adult C57B/6 mice (Jackson Labs) were transcardially perfused with 4% PFA and 0.5% glutaraldehyde (EMS) in 100 mM phosphate buffer (PB). Brains were post-fixed at 4°C overnight, and 50 μm coronal sections were cut on a Leica VT1000 S vibratome. Pre-embedding IHC was performed using WFA (Sigma L1516), amplified with Vectastain Elite ABC kit (Vector Laboratories), and developed with DAB23 (link). Sections were postfixed in 1% osmium tetroxide for 30 min and then embedded in Durcupan ACM epoxy resin (Fluka, Sigma-Aldrich)51 . For reconstruction of WFA-labeled neurons, we cut ~200 serial semithin (1.5 μm) sections on an Ultracut UC-6 ultramictrotome. Selected semithin sections were glued to resin blocks and detached from glass slides by repeated freeze-thaw. Ultrathin sections (60–80 nm) were then cut and placed on Formvar-coated single-slot grids, stained with lead citrate, and examined at 80 kV on a FEI Tecnai G2 Spirit transmission electron microscope equipped with a Morada CCD digital camera (Olympus).
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