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16 protocols using ev depleted fbs

1

Isolation and Characterization of Extracellular Vesicles

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The medium of subconfluent AT-MSCs or WJ-MSCs was changed to Iscove's modified Dulbecco's medium (IMDM) with 1% penicillin/streptomycin and 0.25% EV-depleted FBS (Thermo Fisher Scientific). After 24 h, the supernatants were collected and centrifuged at 1000 rpm for 5 min, and then centrifuged at 2100 rpm for 20 min to remove cell debris from the medium. Cell-free supernatants were ultracentrifuged at 100,000 rpm for 70 min at 4°C, and the pellets were stained with PKH26 (PKH26 linker; Sigma-Aldrich, St. Louis, MO) for 5 min at room temperature. After that, the washing step was performed twice by adding PBS with 0.25% EV-depleted FBS (Thermo Fisher Scientific) and ultracentrifuged at the same conditions. After washing, pellets of EVs were collected.
EVs then were characterized by quantification of the protein concentration using the Bradford method (Bio-Rad, Hercules, CA), size measurement using a particle size analyzer (FDLS3000; Shimadzu Corporation, Kyoto, Japan), and a morphology analysis by transmission electron microscopy (JEM-1400Flash; JEOL Ltd., Tokyo, Japan).
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2

Chondrogenic Differentiation of ADSCs

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ADSCs were seeded in 12-well plates at a density of 5000 cells/well and the upper chamber of 8.0-µm Transwell plates (Corning) at a high density of 8 × 104 cells. Cells were cultured overnight in a medium supplemented with 10% FBS and then rinsed twice with DPBS after removing the culture medium. The replacement culture medium of the upper chambers was culture medium containing 10% EV-depleted FBS, and the lower chambers were replaced with chondrogenic differentiation medium containing 10% EV-depleted FBS. The medium was refreshed every 3 days. On day 21, the efficiency of cartilage differentiation was assessed by histochemical staining (Alcian blue). Cells were analyzed under a light microscope (Olympus BX43, Tokyo, Japan). Commercially available EV-depleted FBS was purchased from Gibco (Life Technologies, Waltham, MA, USA).
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3

Real-Time PCR and Western Blot Protocols

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All solutions were prepared by apyrogenic deionized water (MilliQ System, Millipore, France). All materials used for real-time PCR were purchased from Qiagen (Germany), except the DNA extraction kit that was GF-1 Nucleic Acid Extraction Kit and was purchased from Vivantis Technologies (Malaysia). The GP63 antibody was provided by the Pasteur Institute of Iran, the anti-GFP-HRP goat polyclonal antibody was obtained from Acris antibodies GmbH (Germany), and the beta actin monoclonal antibody was purchased from ProteinTech Group Inc. (Chicago, IL, USA). The nitrocellulose membrane was supplied from Amersham (UK), and the ECL Western blotting substrate was from Pierce™ (Pierce Biotechnology, Thermo Fisher, Rockford, IL, USA). The bovine serum albumin (BSA), phorbol 12-myristate 13-acetate (PMA), Resazurin powder, M199 and RPMI-1640 cell culture media, HEPES, L-glutamine, adenosine, gentamicin, and hemin were sourced from Sigma (Germany). The fetal bovine serum (FBS) and EV-depleted FBS were obtained from Gibco (Life Technologies, Germany). The bicinchoninic acid (BCA) and ELISA kits were purchased from Pierce™ (BCA Protein Assay Kit, USA) and DuoSet ELISA development system (R&D Systems, USA), respectively.
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4

Extracellular Vesicle Isolation from Cell Lines

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Cell lines were purchased from the American Type Culture Collection (ATCC, Manassas, VA, USA) and confirmed to be free of mycoplasma contamination [24 (link)]. All cell lines were cultured in a humidified environment at 37 °C, 5% CO2 and seeded to 70% confluence for 24 h. BEAS-2B cells were cultured in LHC-9 medium, A549 cells in DMEM plus 10% FBS, and the remaining lines in RPMI plus 10% FBS (Gibco/ThermoFisher Scientific, Waltham, MA, USA). Prior to EV collection, cells were washed with DPBS and incubated in their respective media for 48 h and using EV-depleted FBS (Gibco/ThermoFisher Scientific) as required. Conditioned media were collected and processed for EV isolation. To study LINE-1 inducible conditions, 2 × 106 H460 cells were seeded in 150-mm dishes and allowed to attach overnight. Cells were washed with DPBS and incubated with RPMI medium containing 10% EV-depleted FBS plus 1 μM BaP dissolved in 0.2% DMSO. Conditioned media were collected after 48 h and processed for EV isolation.
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5

Extracellular Vesicle Isolation and Characterization

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Twenty-four hours after transfection, the cell culture medium was replaced with DMEM that contains EV-depleted FBS (Gibco). Seventy-two hours after transfection, cell culture supernatants were precleared via two consecutive rounds of centrifugation (500g for 10 min and 2000g for 10 min) and filtered using a 0.2-μm syringe filter (Pall Acrodisc, catalog no. 4562). EVs in the supernatants were then pelleted by ultracentrifugation using SW32 Ti rotor at 100,000g for 2 hours. EV pellet was resuspended in filtered PBS and used immediately or stored at 4°C. EVs were analyzed and quantified by the NanoSight NS300 instrument with NTA software (Malvern Panalytical).
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6

EV Production from LPS-Stimulated THP-1 Cells

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For EV production and harvest, THP-1 cells were collected in 50 ml polypropylene tubes (Greiner Bio One, Frickenhausen, Germany, #227261) by 10 minutes of centrifugation at 200 rcf and 20°C in a swinging bucket Rotanta 460 R centrifuge (Hettich, Tuttlingen, Germany). Next, they were seeded at a density of 1×106 cells/ml in a T75 cm2 tissue culture treated cell culture flask (Greiner Bio One, #658170) in 15 ml of RPMI 1460 medium with GlutaMAX supplemented with 2% EV-depleted FBS (Gibco, #A2720801), and stimulated with 100 ng/ml lipopolysaccharide (LPS) from E. coli serotype 055:B5 (Sigma-Aldrich, St. Louis, USA, #L2880). After 24 hours of incubation at 37°C, 5% CO2 and 95% humidity, cells and the conditioned cell medium were collected.
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7

Extracellular Vesicle Isolation and Characterization

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Cells were seeded either in 12-well plates (250 000 cells/well) for immunoblotting and RT-PCR analyses or in T75 flasks (2 million cells/flask) for immunoblotting analyses and EV isolation. The cells were cultured in DMEM-Glutamax (Gibco), supplemented with 50 U/mL Penicillin, 50 U/mL Streptomycin (Gibco), and either 10% FBS (PAA Laboratories) or 10% EV-depleted FBS (Gibco). For stimulation, cells were exposed to 2.5 µM oAβ, with or without EV inhibitors (20 µM GW4869 or 0.25 µM Manumycin A) dissolved in equal amounts of dimethyl sulfoxide (DMSO), for 6 h. At this point, medium and cells were either isolated or washed with PBS followed by an additional 48 h incubation in 25 mL cell medium for flasks and 2.5 mL for 12-well plates, with or without EV inhibitors. The control medium contained the same amount of DMSO as the EV-inhibitor medium (0.58%). After 48 h, cells were collected for immunoblotting purposes and frozen until further use. Cell medium was collected for EV isolation and centrifuged at 2000xg for 10 min using a TX-400 swinging bucket rotor in a Heraeus Multifuge X1R (Thermo Fisher Scientific) centrifuge to obtain the supernatant, which was frozen until further use.
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8

EV-Depletion and LPS Treatment Assay

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LPSs from Escherichia coli O111:B4, PMA, and PEG 6000 were purchased from Sigma-Aldrich. PBS, TBS, penicillin-streptomycin (10,000 U/mL), FBS, EV-depleted FBS, DMEM, and RPMI-1640 were purchased from Gibco. Lipofectamine 2000 reagent, protease inhibitor tablet, and BSA were purchased from Thermo Fisher Scientific. The K. pneumoniae strain was purchased from ATCC (#43186, Manassas, VA). Recombinant human CC16 was purchased from Novus Biologicals (NBP2-35126, Centennial, CO).
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9

Murine MSC Extracellular Vesicle Isolation

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Murine MSCs were seeded 1 × 106 cells per 10 cm2 and incubated overnight. Following the overnight incubation, cells were washed in phosphate-buffered saline (PBS) and fresh media containing EV-depleted FBS (Gibco, UK) was applied. EV-depleted FBS was obtained by centrifugation at 120,000×g for 18 h at 4 °C. Cells were incubated for 48 h under standard conditions. After 48 h, the media was collected. The conditioned medium was centrifuged at 400×g for 5 min at 4 °C. The resulting supernatant was sequentially centrifuged at 2,000×g for 20 min at 4 °C and 10,000×g for 45 min. Then the supernatant was transferred to ultracentrifuge tube and centrifuged at 100,000×g for 90 min at 4 °C using SW28Ti rotor (Beckman Coulter, USA) in the BECKMAN L70 ultracentrifuge (Beckman Coulter, USA).
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10

HIV-1 NL4.3 Virus Production and Characterization

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TZM-bl cells (NIH AIDS Reagent Program, Germantown, MD), and 293T cells (ATCC) were maintained in complete DMEM (Gibco-BRL/Life Technologies, Carlsbad, CA) containing 5% EV-depleted FBS (Gibco, Carlsbad, CA) as described17 . HIV-1 pNL4.3 plasmid (NIH AIDS Reagent Program) was used to generate HIV-1 NL4.3 virus in 293T cells4 (link)–6 (link). Virus titers were determined by TZM-bl renilla luciferase units (RLU) and EnzChek Reverse Transcriptase Assay (Life Technologies). Cell viability was determined by MTT assay with three replicates per donor at the time of infection analysis as described4 (link),17 .
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