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6 protocols using ren cells

1

Differentiation of ReN Neural Progenitor Cells

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ReN cells were maintained as described by Kim, Y.H. et all [32 (link)]. Briefly, ReN cells (Millipore) were maintained in Proliferation medium (484.5 ml DMEM/F12 (Gibco/Life Technologies) with 0.5 ml of heparin (2 mg/ml stock, STEMCELL Technologies), 10 ml of B27 (Life Technologies) 5 ml of 100X penicillin/streptomycin/amphotericin B (Lonza), 80 μl of bFGF stock and 100 μl of EGF stock) on Matrigel (Sigma-Aldrich) coated flasks at 37°C CO2 incubator. For differentiation the media were changed to Differentiation media, which is Proliferation media containing no growth factors, bFGF or EGF. The cells were maintained in Differentiation media for ~ 6 days to obtain neuronal structure prior to co-IP assays.
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2

Labeling of extracellular vesicles from neural progenitor cells

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Human neural progenitor cell line ReN Cells (Millipore, U.S.A.) were cultured in DMEM/F12 medium (Life Technologies, U.S.A.) containing 2% B27 (Life Technologies), bFGF (10 ng/mL; Abm, Canada) and EGF (20 ng/mL; Abm) under 5% CO2 at 37 °C. GL261 murine glioma cell line was maintained in DMEM/F12 containing 10% fetal bovine serum (FBS) (PAN, Germany) in a CO2 incubator. To label EVs with tdTomato or Gluc, ReN Cells were transduced with a lentivirus vector to stably express palm-tdTomato or Gluc-TM which labels cell membrane and thus EV membrane as we described.24 (link),30 (link) For bioluminescence and fluorescence imaging studies, GL261 cells were stably transduced with a lentivirus vector carrying expression cassettes for Fluc and GFP.
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3

Labeling Neural Stem Cells and Extracellular Vesicles

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ReN cells were purchased from Millipore (Billerica, USA). The cells were cultured in DMEM/F12 (Life Technologies, Grand Island, USA) supplemented with 2% B27 (Life Technologies), 20 μg/mL EGF (Abm, Richmond, Canada), 10 μg/mL bFGF (Abm) in an incubator with 5% CO2 at 37 °C. BV2 and human embryonic kidney (HEK293T) cells (Type Culture Collection of the Chinese Academy of Sciences, Shanghai, China) were maintained in DMEM (Life Technologies) containing 10% fetal bovine serum (FBS) (PAN, Aidenbach, Germany) in a CO2 incubator. For HEK293T cell-derived EVs (EV293) isolation, EV-depleted FBS (prepared by overnight centrifugation at 200,000 g at 4 °C) was used. To label EVs with tdTomato, ReN cells were stably transduced with packaged lentivirus vectors to express tdTomato fused to palmitoylation signal (palm-tdTomato) which labels cell membrane 30 (link). In addition, to display Gaussia luciferase (Gluc) on EV surface, lentivirus expressing Gluc fused to the transmembrane domain (TM) of the platelet-derived growth factor receptor (Gluc-TM) was packaged to stably transduce ReN cells 11 (link). Both of Palm-tdTomato and Gluc-TM constructs have been verified in previous studies 11 (link),30 (link).
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4

Isolation and Characterization of ReN-NV

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ReN cells were purchased from Millipore (USA). The cells with passages of 5–10 were cultured in DMEM/F12 (Life Technologies, USA) supplemented with 2% B27 (Life Technologies), 20 ng/mL EGF (Abm, Canada), 10 ng/mL bFGF (Abm) and 2 μg/mL heparin and incubated with 5% CO2 at 37 °C. ReN cell spheres were dissociated with Accutase (Life Technologies). The cells were centrifuged at 3000×g for 10 min to remove the nucleus after homogenate by ultrasonication. The supernatants were extruded serially through 1 μm, 400 nm and 200 nm polycarbonate porous membranes (Whatman, UK) using a mini extruder (Avanti Polar Lipids, USA). Subsequently, the extruded ReN-NV were purified in a layer between 10% and 50% (v/v) iodoxanol by ultracentrifugation (L-80XP, Bechman Coulter, USA) at 100,000×g for 2 h. The ReN-NV pellet was resuspended in PBS after a wash step by another ultracentrifugation with PBS.
ReN-NV were observed by a Tecnai G2 transmission electron microscope (FEI, USA). The total protein concentration was determined by BCA protein assay (Pierce, USA). The size distribution and number were analyzed by NTA using a ZetaView system (Particle Metrix, Germany). As a control, HEK293 cell-derived NV (293-NV) were prepared and identified following an identical procedure.
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5

Isolation and Characterization of ReN-Derived Nanovesicles

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ReN cells were purchased from Millipore (USA). The cells with passages of 5-10 were cultured in DMEM/F12 (Life Technologies, USA) supplemented with 2% B27 (Life Technologies), 20 μg/mL EGF (Abm, Canada), 10 μg/mL bFGF (Abm) and 2 μg/mL heparin and incubated with 5% CO 2 at 37 °C. ReN cell spheres were dissociated with Accutase (Life Technologies). The cells were centrifuged at 3,000 × g for 10 min to remove the nucleus after homogenate by ultrasonication. The supernatants were extrudedserially through 1 μm, 400 nm and 200 nm polycarbonate porous membranes (Whatman, UK) using a mini extruder (Avanti Polar Lipids, USA). Subsequently, the extruded ReN-NV were puri ed in a layer between 10% and 50% (v/v) iodoxanol by ultracentrifugation (L-80XP, Bechman Coulter, USA) at 100,000 × g for 2 h. The ReN-NV pellet was resuspended in PBS after a wash step by another ultracentrifugation with PBS.
ReN-NV were observed by a Tecnai G2 transmission electron microscope (FEI, USA). The total protein concentration was determined by BCA protein assay (Pierce, USA). The size distribution and number were analyzed by NTA using a ZetaView system (Particle Metrix, Germany). As a control, HEK293 cell-derived NV (293-NV) were prepared and identi ed following an identical procedure.
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6

Extracellular Vesicle Isolation from ReN Cells

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ReN cells were purchased from Millipore (USA). The cells were cultured in DMEM/F12 (Life Technologies, USA) supplemented with 2% B27 (Life Technologies), 20 μg/mL EGF (Abm, Canada), 10 μg/mL bFGF (Abm) and 2 μg/mL heparin and incubated with 5% CO 2 at 37 °C. ReN cell spheres were dissociated with Accutase (Life Technologies). The cells were centrifuged at 3,000 × g for 10 min to remove the nucleus after homogenate by ultrasonication. The supernatants were extruded serially through 1 μm, 400 nm and 200 nm polycarbonate porous membranes (Whatman, UK) using a mini extruder (Avanti Polar Lipids, USA). Subsequently, the extruded ReN-NV were puri ed in a layer between 10% and 50% (v/v) iodoxanol by ultracentrifugation (L-80XP, Bechman Coulter, USA) at 100,000 × g for 2 h. The ReN-NV pellet was resuspended in PBS after a wash step by another ultracentrifugation with PBS.
ReN-NV were observed by a Tecnai G2 transmission electron microscope (FEI, USA). The total protein concentration was determined by BCA protein assay (Pierce, USA). The size distribution and number were analyzed by NTA using a ZetaView system (Particle Metrix, Germany). As a control, HEK293 cell-derived NV (293-NV) were prepared and identi ed following an identical procedure.
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