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3 protocols using βiii tubulin tuj1

1

Immunostaining Protocol for Stem Cell Markers

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For immunostaining, cells were fixed with 4% paraformaldehyde, blocked and incubated with primary antibodies overnight at 4 °C. They wer e then stained with Alexa Fluor conjugated secondary antibodies Goat anti-Rabbit IgG (H+L) (Thermo Fisher) and Goat anti-Mouse IgG (H+L) (Thermo Fisher) at RT for one hour. Nuclear staining was performed with DAPI (BD Bioscience). The following primary antibodies were used in this study: NANOG (D73G4) XP® Rabbit mAb #4903 (1:300) (4903S, Cell Signaling), NESTIN (1:200) (10C2, Biolegend 656801), EDC4 (1:50) (Abcam ab72408) DDX6 (Novus NB200–192), βIII-tubulin (TUJ1, Biolegend 801211), SOX1 (R&D SYSTEMS AF3369), SOX2 (R&D SYSTEMS AF2018), MYOSIN (MF-20 Hybridoma bank), LSM14A (1:50) (N3C3, GeneTex GTX120902), LSM14B (1:50) (Sigma Aldrich HPA061189).
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2

Histological Analysis of Cortical Organoids

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Brain cortical organoids at 20-100 days in culture were fixed with 10% formalin, dehydrated with ethanol, and embedded in paraffin blocks. 10 μm thick sections were deparaffinized with xylene, rehydrated in a graded series of ethanol and double distilled water in a standard manner, and then stained with H&E. To detect protein expression, the sections were heated to unmask the epitopes, blocked with 10% goat serum, then primary antibodies were added overnight [Sox2 from EMD Millipore, β III tubulin (TUJ1, BioLegend, San Diego, CA)]; IBA-1, NRG1, ErbB4, GFAP, CXCR3, Ang2 and Ang1 from Abcam; Brachyury from R&D Systems; Cleaved caspase 3 (CC3), NFL and NFM from Cell Signaling, Danvers, MA; BDNF from Thermo Fisher Scientific and CXCL-10 from PeproTech (Rocky Hill, NJ). Fluorescence staining was performed using fluorochrome-labelled secondary antibodies (Alexa Fluor 488, Alexa Fluor 647, Invitrogen). The sections were covered with Vectashield mounting medium containing DAPI (H-1200) obtained from Vector Laboratories Inc (Burlingame, CA).
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3

Immunocytochemistry Protocol for Cell Labeling

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For immunocytochemistry (ICC), cells were fixed with 4% paraformaldehyde (PFA) 15 min on ice, washed and incubated in blocking solution (1% Bovine serum albumin (BSA), 0,25% Triton X-100 (0,25% Tx) in 0.1M PBS) for 1 h at RT. Primary antibody (βIII tubulin (Tuj1, 1:1000, BioLegend), c-Fos (1:200, Cell Signaling), ChR2 (1:500, Progen), mCherry (1:500, Abcam) GFP (1:500, ThermoFisher Scientific) was added to the cells in blocking solution and incubated O/N at 4 °C. After washing, the cells were incubated 1 h at RT with Alexa-Fluor-conjugated secondary antibodies (568 goat and 488 goat and donkey) and Hoechst (Sigma Aldrich).
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