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7 protocols using ez cytofunnel

1

BALF Cell Differential Analysis

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BALF were briefly centrifuged at 150 x g and the supernatant was collected for analysis. Pelleted cells were resuspended in PBS and cells were counted using a hemocytometer prior to loading into an EZ Cytofunnel (Thermo Scientific) and centrifuged at 600 RPM for 10 minutes. Slides were fixed and stained using the Hema 3 kit (Thermo Scientific) and cell differentials were counted based on at least 200 cells per slide.
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2

Analysis of BAL Cytokines and Mucins

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BAL fluids were harvested by 3 successive instillations of 500 μL of PBS into the lungs, and pooled BAL fluids were briefly centrifuged at 150 × g and supernatants was collected for analysis of cytokines and other secreted mediators. BAL levels of IL-33, IL-5, IL-13, IL-17A, IL-1β and amphiregulin (AREG) were assessed using DuoSet ELISA Kits (R&D Systems; DY3626, DY405, DY413, DY1399, DY401, DY989) according to manufacturer protocol and were read on a BioTek Synergy HT plate reader. MUC5AC in BAL was analyzed using a Mouse Mucin-5 Subtype AC ELISA kit (MyBioSource; MBS265057), according to the manufacturer’s instructions. Pelleted BAL cells were resuspended in PBS and counted using a hemocytometer prior to loading into an EZ Cytofunnel (Thermo Scientific) and centrifuged at 600 RPM for 10 minutes. Cytospin slides were fixed and stained using the Hema 3 kit (Thermo Scientific) and cell differentials were counted based on at least 200 cells per slide.
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3

Analysis of BAL Cytokines and Mucins

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BAL fluids were harvested by 3 successive instillations of 500 μL of PBS into the lungs, and pooled BAL fluids were briefly centrifuged at 150 × g and supernatants was collected for analysis of cytokines and other secreted mediators. BAL levels of IL-33, IL-5, IL-13, IL-17A, IL-1β and amphiregulin (AREG) were assessed using DuoSet ELISA Kits (R&D Systems; DY3626, DY405, DY413, DY1399, DY401, DY989) according to manufacturer protocol and were read on a BioTek Synergy HT plate reader. MUC5AC in BAL was analyzed using a Mouse Mucin-5 Subtype AC ELISA kit (MyBioSource; MBS265057), according to the manufacturer’s instructions. Pelleted BAL cells were resuspended in PBS and counted using a hemocytometer prior to loading into an EZ Cytofunnel (Thermo Scientific) and centrifuged at 600 RPM for 10 minutes. Cytospin slides were fixed and stained using the Hema 3 kit (Thermo Scientific) and cell differentials were counted based on at least 200 cells per slide.
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4

Immunostaining of Embryoid Bodies

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Day 9 EBs were harvested and fixed with 4% paraformaldehyde at 4°C overnight. EBs were sent to ULAM (Unit for laboratory animal medicine) at University of Michigan for paraffin processing, embedding, and sectioning. Antigen unmasking on slides was using citric acid methods as prescribed previously (Gage and Camper, 1997 (link)). Immunostaining was performed by combining of VectaStain ABC-HRP kit (Vector laboratories) and TSA Kit #24, with HRP-Streptavidin and Alexa Fluor 568 Tyramide (ThermoFisher Scientific). The primary antibodies were used for staining: anti-N-cadherin (mouse/monoclonal/1:2000, BD), anti- cardiac troponin T (CT3 clone, mouse/monoclonal/1:100, Developmental Studies Hybridoma Bank) and anti-myosin heavy chain antibody (MF20 clone, mouse/monoclonal/1:100, Developmental Studies Hybridoma Bank). For cytospin, Day 2 WT and Wdr5KO EBs were harvested and trypsinized to single cell suspension. Cells were attached to EZ cytofunnels (ThermoFisher) slides using Cytospin 3 (Shandon). Cells were fixed with 100% methanol and immunostaining was performed using p53 antibody (NCL-L-P53-CM5P, Leica biosystems) at 1:100 dilution. Counter nuclear staining was performed with DAPI (Molecular Probes). Control sections were incubated without primary antibodies. 4 representative pictures from different field were recorded under fluorescence microscope (Olympus DP73).
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5

Cytospin Immunocytochemistry of mCSCs and mBMSCs

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Cultured mCSCs and mBMSCs were suspended at 5 × 105 cells/mL in PBS and 200 μL was loaded into EZ Cytofunnels (ThermoFisher, Carlsbad, CA) within a Shandon Cytospin 4 (ThermoFisher, Carlsbad, CA). Cells were spun down for 3 min on low acceleration and then fixed onto polylysine-coated slides using Shandon Cell-Fixx fixative (ThermoFisher, Carlsbad, CA). Cells were dried overnight and prepared for immunocytochemistry with phalloidin and DAPI at 1:10,000 for 5 min. Confocal imaging utilized a 63× oil objective (Leica, Buffalo Grove, IL), with zoom factor of 0.75, 1.1 Airy unit pinhole, and HyD emission bandwidth of 415–510 at power intensity of 1.5 W and gain of 150 V. The pixel dimensions were 0.241 μm in the x and y plane and 0.357 μm in the z-plane during z-stack acquisition; step size was optimum at 0.35 μm with 28–30 slices per z-stack.
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6

Immunostaining of Embryoid Bodies

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Day 9 EBs were harvested and fixed with 4% paraformaldehyde at 4°C overnight. EBs were sent to ULAM (Unit for laboratory animal medicine) at University of Michigan for paraffin processing, embedding, and sectioning. Antigen unmasking on slides was using citric acid methods as prescribed previously (Gage and Camper, 1997 (link)). Immunostaining was performed by combining of VectaStain ABC-HRP kit (Vector laboratories) and TSA Kit #24, with HRP-Streptavidin and Alexa Fluor 568 Tyramide (ThermoFisher Scientific). The primary antibodies were used for staining: anti-N-cadherin (mouse/monoclonal/1:2000, BD), anti- cardiac troponin T (CT3 clone, mouse/monoclonal/1:100, Developmental Studies Hybridoma Bank) and anti-myosin heavy chain antibody (MF20 clone, mouse/monoclonal/1:100, Developmental Studies Hybridoma Bank). For cytospin, Day 2 WT and Wdr5KO EBs were harvested and trypsinized to single cell suspension. Cells were attached to EZ cytofunnels (ThermoFisher) slides using Cytospin 3 (Shandon). Cells were fixed with 100% methanol and immunostaining was performed using p53 antibody (NCL-L-P53-CM5P, Leica biosystems) at 1:100 dilution. Counter nuclear staining was performed with DAPI (Molecular Probes). Control sections were incubated without primary antibodies. 4 representative pictures from different field were recorded under fluorescence microscope (Olympus DP73).
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7

Immunofluorescence Staining of Cell Spheroids

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Immunofluorescence was performed on cytospins (EZ Cytofunnels) (Thermo Scientific) for SC and on coverslips for adherent cell cultures. Samples were fixed with ice-cold methanol for 10 minutes at -20°C, blocked with a 3% BSA/PBS solution followed by incubation overnight at 4°C with the primary antibody. Secondary antibody was applied for 1 hour at room temperature; samples were mounted with DAPI-containing Fluoromount G (Southern Biotech) and analyzed on a confocal microscope (Zeiss LSM 510 Meta). To certify that the staining was positive throughout the whole spheroid, z-stacks were performed. The antibodies used are listed in S1A Table.
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