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7 protocols using primary human brain vascular pericytes

1

Culturing Primary Human Brain Pericytes

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Primary human brain vascular pericytes (ScienCell, Carlsbad, CA, USA, Cat# 1200) belonging to five different lots were maintained in pericyte-specific growth medium (ScienCell, Cat# 1201) supplemented with fetal bovine serum (FBS; 2%), growth factors, 100 units/mL penicillin, and 100 μg/mL streptomycin. Cells were used from passages 2 to 7. Human embryonic kidney (HEK)-293T cells (ATCC, Manassas, VA, USA, Cat# CRL-11268) were cultured in DMEM (Thermo Fisher Scientific, Carlsbad, CA, USA, Cat#11995–065) supplemented with 10% FBS (ScienCell, Cat# 0500), penicillin 100 units/mL, and 100 μg/mL streptomycin (Thermo Fisher Scientific, Cat# 15140–122). Cultures were maintained in 5% CO2 at 37°C.
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2

Immunofluorescent Characterization of Pericytes

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Primary human brain vascular pericytes were obtained from ScienCell (Carlsbad, CA) and grown according to the vendor's instructions. Human recombinant TGF-β was purchased from Peprotech (100-21). Antibodies used in the immunofluorescent staining were purchased from commercial sources as follows: rabbit-anti-mouse collagen IV (Millipore, AB756P), mouse-anti-mouse-α-SMA-FITC (Sigma, F3777), goat-anti-mouse CD31 (R&D, AF3628), Alexa Fluor 555 conjugated goat-anti-Rabbit Ig (Invitrogen, A21429) and Alexa Fluor 488 conjugated goat-anti-human Ig (Invitrogen, A11013). Two monoclonal anti-CD248 antibodies, Clone 8 and 9G5, were generated in house by immunization of rabbits or rats (respectively) with a CD248ECD-Fc fusion protein. These antibodies were selected for all immunostaining and internalization assays as they do not compete with MORAb-004 for CD248 binding in a competition FACS assay (Figure S1C).
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3

Vascular Pericytes and Astrocyte Cultures

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Primary human brain vascular pericytes and human astrocytes were obtained from ScienCell Research Laboratories (Carlsbad, CA, USA) and cultured for additional three passages before used for experiment. The cells were cultured in complete medium provided by the supplier, containing 2% fetal bovine serum (FBS), antibiotics (penicillin and streptomycin) and pericytes or astrocytes growth supplement. Primary central memory T (TCM) cells were generated from naïve CD4+ T cells isolated from peripheral blood mononuclear cells (PBMC) selected from healthy blood donors, as previously described (Bosque and Planelles, 2009 (link); Piekna-Przybylska et al, 2017 (link)). ATM Kinase Inhibitor (KU55933) and PARP inhibitor I (3-ABA, 3-Aminobenzamide) were obtained from Calbiochem. DNA-PK inhibitor (NU7441) was obtained from Apexbio Technology LLC.
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4

Culturing Primary Human Brain Vascular Cells

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Primary human brain vascular pericytes were purchased from ScienCell (Carlsbad, CA, USA) and cultured in the pericyte medium (provided by ScienCell). Cell culture dishes were coated with poly-L-lysine (2μg/cm2) and were used in passages 2–5. Human brain microvascular endothelial cells (HBMECs) were obtained also from ScienCell and cultured in endothelial medium (provided by ScienCell) and were used for passages 4–14.
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5

Culturing Primary Human Brain Pericytes

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Primary human brain vascular pericytes (ScienCell, Carlsbad, CA, USA, Cat# 1200) belonging to five different lots were maintained in pericyte‐specific growth medium (ScienCell, Cat# 1201) supplemented with fetal bovine serum (FBS; 2%), growth factors, 100 units/mL of penicillin, and 100 µg/mL of streptomycin. Cells were used from passages 2 to 7. Human embryonic kidney (HEK)‐293T cells (ATCC, Manassas, VA, USA, Cat# CRL‐11268) were cultured in DMEM (Thermo Fisher Scientific, Carlsbad, CA, USA, Cat#11995‐065) supplemented with 10% of FBS (ScienCell, Cat# 0500), penicillin 100 units/mL, and 100 µg/mL of streptomycin (Thermo Fisher Scientific, Cat# 15140‐122). Cultures were maintained in 5% of CO2 at 37°C.
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6

Isolation and Culture of Astrocytes and Pericytes

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Astrocytes were isolated and cultured from postnatal mouse brains (0–4 days) as described previously [61 (link)]. They were then seeded onto 24-well plates pre-coated with 0.001 % poly-l-lysine for 30 min. Primary human brain vascular pericytes (ScienCell) were also seeded in a similar way. Upon confluency, the cells were treated with 0.1 % BSA/PBS for 16 h which served as control, or with 500 ng/ml recombinant human Ang-2 for 16 h plus/minus 1 µM AKB-9785 for 10 min followed by washing with PBS. Cells were lysed for 15 min on ice in RIPA buffer (Sigma) containing one tablet each of protease and phosphatase inhibitor cocktail (Roche). Following this, the samples were transferred into Eppendorf tubes and centrifuged at 16,000×g at 4 °C for 10 min. The supernatants were transferred into new Eppendorf tubes and stored at −80 °C until further use.
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7

Engineered Human iPSC-Derived BBB Model

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For coculturing, astrocytes (0.12 × 106 cells/cm2, iCell Astrocyte; FCDI) and neurons (0.04 × 106 cells/cm2, iCell GABANeuron; FCDI) were cocultured on 24-well plates coated with 0.1 mg/mL poly-l-lysine (TREVIGEN, MD) and 3.3 μg/mL laminin-521 (BioLamina, Sweden) in 1:1 astrocyte/neuron medium purchased from FCDI on D4. On D8, 5.0 × 103 cells/cm2 of primary human brain vascular pericytes (ScienCell, CA) were seeded on the basolateral side of Transwells by flipping the plate upside-down in a pericyte medium (ScienCell). A coculture BBB model was constructed as shown in Figure 1B. In our human iPSC-derived BBB (hiBBB) models, ECM or neuron medium was used in each monoculture BBB system (Mono-ECM and Mono-N) or coculture BBB system (Co-ECM and Co-N), respectively. In the apical wells, ECM was used for all groups (Fig. 1A, B).
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