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4 protocols using fluorocet kit

1

Lipid Regulation and Inflammation Modulation

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Ginkgetin, berberine, 1,1′‐Dioctadecyl‐3,3,3′,3′‐tetramethylindocarbocyanine perchlorate (DiI) and lipopolysaccharide (LPS) from E. coli were purchased from Sigma‐Aldrich (St. Louis, MO) and dissolved in DMSO as stock solutions. RNeasy micro kit and RNase‐free DNase were obtained from Qiagen (Germantown, MD). Primers for TNFα, CCL2, IL6 and CD36, and iTaq Universal SYBR Green RT‐qPCR kit were obtained from Bio‐Rad (Hercules, CA). Thioglycollate was purchased from Beckton‐Dickinson (Franklin Lakes, NJ). Exosome precipitating reagent ExoQuick‐TC and Fluorocet kit were from System Biosciences (Palo Alto, CA). Phosphate buffered saline (PBS), Dulbecco's Modified Eagle Medium (DMEM), heat‐inactivated foetal bovine serum (FBS), native low‐density lipoprotein (LDL), bovine serum albumin (BSA) and cell culture related reagents were purchased from Thermo Fisher Scientific (Waltham, MA). All other chemicals were purchased from Sigma‐Aldrich or Thermo Fisher Scientific.
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2

Exosome Isolation and Characterization from BAL Fluid

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Exosome isolation and analysis were carried out as per our described protocol (68 ). Briefly, exosomes from cell-free BAL fluid were precipitated by ExoQuick-TC (System Biosciences, Palo Alto, CA). The total protein quantification and enumeration of exosomes from BAL fluid were performed by FluoroProfile Protein Quantification Kit (Sigma-Aldrich) and a FluoroCet kit (System Biosciences), respectively, according to manufacturer’s guidelines. Anti-CD63 coated beads (Exo-Flow, System Biosciences) were used to capture exosomes, and bead-bound exosomes were analyzed for exosome-specific staining (Exo-APC, System Biosciences) by LSRFortessa X-20 (BD Biosciences) flow cytometer. Positive staining with anti-Siglec-F (an AM specific marker) was done to ascertain cellular origin, and staining with anti-H-2Kd and anti-H-2Kb were done to distinguish the origin (i.e.donor vs recipient) for BAL fluid exosomes.
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Exosome Characterization Techniques

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The number and size of the EV particles were evaluated using nanoparticle tracking analysis methods on a NanoSight NS-300 (Malvern), instrument per manufacturer’s instructions. Acetylcholinesterase (AChE) enzymatic assays were performed using fluorescent enzymatic assays (Fluorocet kit, SBI). The protein quantification was performed using the Quick Start™ Bradford Protein Assay (Bio-Rad). The exosome RNA concentration was determined by NanoDrop UV spectroscopy (Thermo Scientific).
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4

Exosome Quantification and Characterization

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Parts of the exosome samples were lysed with RIPA lysis buffer (Merck, Rahway, NJ, USA) and protein concentrations in exosome lysates were determined with a BCA protein assay (Pierce, Appleton, WI, USA). Exosome quantification in samples was carried out with a Fluorocet kit (SBI, System Biosciences). The presence of exosomes in samples was also confirmed by Western blot assay.
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