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4 protocols using s1pr1

1

Multiparametric Flow Cytometry Analysis

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Single cell suspensions were incubated with a fixable viability dye (eBioscience) for 20 min at 4°C. Samples were blocked with FC block (24G2 grown in house and mouse serum) for 20 min followed by antibody staining for 20 min. Antibodies used: CD45.1 (A20, eBioscience), CD4 (RM4-5, eBioscience), Va2 (B20.1, BD), MHC II (M5/114.15.2, eBioscience), CD64 (X54-5/7.1, BioLegend), CD8a (53-6.7, eBioscience), CD103 (M290, BD Horizon), Ly6G (1A8 BD), CD69 (H1.2F3, BD), S1PR1 (713412, R&D Systems), interferon-γ (IFN-γ) (XMG1.2, BioLegend), and CD44 (IM7, eBioscience). Samples were washed twice with FACS buffer and acquired on a Miltenyi Macsquant analyzer. Samples were analyzed using FlowJo (Treestar) version 9.7.5.
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2

Isolation and Analysis of Lymph Node Cells

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dLNs (2 inguinal, 2 axillary, 2 brachial, 2 popliteal, and 4 cervical LNs per mouse) were isolated and digested as described (45 (link)) in RPMI 1640 with 2% FBS, 0.8 mg/ml Dispase (Roche Diagnostics), 0.2 mg/ml Collagenase P (Roche Diagnostics), and 0.1 mg/ml DNase I (Sigma-Aldrich). Single cell suspensions were stained in the presence of Fc-block with fluorochrome-conjugated antibodies (all purchased from BioLegend unless otherwise indicated) against the following targets: CD4 (RM4-4), CD45 (30-F11), CD3 (1452C11), TCRb (H57-597), CD44 (IM7), CD62L (MEL-14), CD69 (H1.2F3), gp38 (8.1.1), CD31 (MEK13.3), S1PR1 (713412, R&D Systems). Staining with S1PR1 antibody was performed in the presence of fatty acid–free BSA from Sigma-Aldrich; blood cells were used as S1PR negative controls (17 (link), 46 (link)). Stained cells were analyzed with the FACS Canto II (BD Biosciences) and Flow-Jo software. For ki67 (clone 16A8, BioLegend) intracellular staining, cells were fixed and permeabilized with the Foxp3 Fix/Perm Buffer Set (BioLegend). LN stromal cells were sorted as described (45 (link)) using a BD FACSAria Fusion cell sorter; CD45+ cells were depleted prior to sorting with anti-biotin magnetic beads (Miltenyi Biotec).
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3

Immunofluorescence Analysis of Placental Arteries

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Isolated arterial chorionic placental vessels were incubated in calcium-free Krebs for at least 30 min to allow vessel vasodilation. Subsequently, the arteries were fixed with 4% PFA and left overnight at 4 °C. PFA-fixed arteries were OCT-embedded. For immunofluorescence, frozen placental artery sections were stained for Nogo-B (1:200, R&D), S1PR1 (1:200, R&D), and CD31 (1:200, Invitrogen) overnight at 4 °C and were then stained with Cy5-labeled anti-goat antibody (#A21436, Invitrogen, 1:500) Alexa 488 anti-rabbit (#016-540-084, Jackson ImmunoResearch, 1:200) and Alexa 568 anti-mouse in PBS for 1 h. Nuclei were stained with DAPI. Confocal immunofluorescence images of the tissues were captured on an Olympus Fluoview confocal microscope and quantified with ImageJ.
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4

Comprehensive Immune Cell Phenotyping

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Cells were stained with fluorochrome-labeled antibodies to perforin, granzyme B, CXCR3, Bcl6, Eomes, fixable viability dye (eBiosciences, San Diego, CA), CD44, CD62L, Ly6C, IL-10 (Biolegend, San Diego, CA), Tcf1 (Cell Signaling Technology, Danvers, MA), S1PR1 (R&D, Minneapolis, MN), IFNυ, TCRαβ and CD8 (BD Biosciences, San Jose, CA). Flow data were acquired on an Accuri C6 or LSRII (BD Biosciences, San Jose, CA) and analyzed using FlowJo software (Tree Star Inc., Ashland, OR).
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