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6 protocols using penicillin streptomycin solution 100x

1

Culturing Human Lung and Cancer Cells

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The human lung fibroblast cell line MRC-5 was supply by (LGC Standard-ATCC CCL171). MRC-5 cells were maintained in Eagle’s Minimum Essential Medium (EMEM) ATCC 30-2003, supplemented with 15% FBS (Euroclone), 1% penicillin-streptomycin solution 100X (Euroclone) and 1% non-essential-amino acid (Euroclone).
For the human cancer cell line HeLa (LGC Standard-ATCC CCL-2), cells were cultured in RPMI-1640 medium (Euroclone), with 10% FBS, 1% penicillin–streptomycin solution 100X (Euroclone). Cells were incubated at 37 °C in 5% CO2.
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2

SILAC Labeling of HeLa and MA104 Cells

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Human epithelial adenocarcinoma HeLa cells (ATCC® CCL-2™) and African green monkey kidney epithelial cells (MA104) were propagated in Dulbecco's modified Eagle's medium (DMEM) (Gibco-BRL, Gaithersburg, MD) supplemented with heat-inactivated 10% fetal bovine serum (FBS) (Gibco/BRL) and 1% penicillin-streptomycin solution 100X (EuroClone), at 37 °C in an atmosphere of 5% of CO2. HeLa cells were SILAC-labelled using SILAC DMEM (#89985, ThermoScientific) deficient in lysine and arginine, supplemented with 10% dialyzed fetal bovine serum (Invitrogen). To this medium, the appropriate amino acids were added as follows: unlabelled l-lysine (Lys0) and l-arginine (Arg0) (both from Sigma) were used to obtain light-labelled cells, and 13C615N4l-arginine (Arg10, CNLM-539, Cambridge Isotope Laboratory) and 13C615N2l-lysine (Lys8, CNLM-291, Cambridge Isotope Laboratory) were used to obtain heavy-labelled cells. The final amino acid concentration corresponded to the standard DMEM composition (i.e.84 mg/l arginine and 146 mg/l lysine). Cells were cultured for at least seven replications to achieve complete labelling. Full protein labelling was verified by geLC-MS analysis (data not shown) [11 (link)].
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3

EBV-Immortalized PBMC Cell Culture

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Epstein–Barr Virus (EBV) immortalized PBMCs were provided by Galliera Genetic Bank, from lymphocytes of the two patients, their parents, and four healthy controls, including two children (cell lines 281 and 283) and two adults (cell lines 519 and 550). The immortalized cells were maintained in RPMI 1640 medium without L-Glutamine with phenol red (Euroclone, Milan, Italy) supplemented with 10% fetal bovine serum (FBS South America origin EU Approved, Euroclone, Milan, Italy), 1% L-Glutamine 100X 200 mM (Euroclone, Milan, Italy), and 1% penicillin–streptomycin solution 100X (Euroclone, Milan, Italy) at 37 °C in a 5% CO2 atmosphere. Each cell line was synchronized with thymidine treatment, which requires an inoculum of 500,000 cells/mL to be cultured for 24 h in a complete medium enriched with 1% thymidine 200 mM (Merck Life Science, Milan, Italy), capable of blocking cells in the G1 phase, and for the following 24 h in complete medium without thymidine, to restart growth starting from the same stage of the cell cycle, at 37 °C in a 5% CO2 atmosphere. At the end of the treatment, the cells were washed with HEPES 50 mM (Merck Life Science, Milan, Italy), to prevent cryo-induced pH changes, and pellets of 5 × 106 cells were stored at −80 °C.
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4

Culturing K-562 Chronic Myeloid Leukemia Cells

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The American Type Culture Collection (ATCC) in Manassas, Virginia, USA, provided the K-562 human chronic myeloid leukemia cell line, which was then frozen in liquid nitrogen. After achieving 70–80% confluency, cells were passaged twice weekly, and modest transit numbers (≤ 20) were used in all tests. To make sure cultures were free of contamination, Lonza MycoAlert™ mycoplasma testing kits were employed in accordance with the manufacturer's recommendations. In addition to 10% (v/v) heat-inactivated fetal bovine serum (FBS) (Biowest, South America Origin), 1% penicillin–streptomycin solution 100X (EuroClone, Italy), and 1% L-glutamine 100X (EuroClone, Italy), cells were sub-cultured in RPMI-1640 medium 1X (EuroClone, Italy). In an incubator with 5% CO2 that was humidified, cells were kept at 37 °C (NU-5810E, NUAIRE, Plymouth, MN 55447, USA).
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5

CFTR Inhibitor and Potentiator Assay

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RPMI 1640, fetal bovine serum (FBS), penicillin–streptomycin solution 100X, L-glutamine 100X 200 mM, Lympholyte®-H, and prestained protein SHARPMASS VI MW marker were purchased from Euroclone SpA (Milan, Italy); anti-MMP9 antibody, horseradish peroxidase (HRP)-linked anti-rabbit secondary antibody, protease inhibitor cocktail (100X), and phosphatease inhibitor cocktail (100X) were obtained from Cell Signaling Technology (Danvers, MA, USA); dibutyryl-cAMP, isopropyl β-D-1-thiogalactopyranoside (IPTG), yeast extract, tryptone, PGex6P1, 6,7-Dihydro-7,9-dimethyl-6-(5-methyl-2-furanyl)-11-phenylpyrimido (4′,5′,3,4) pyrrolo (1,2-a) quinoxaline –8,10 (5H,9)-dione (PPQ-102), a reversible and voltage-independent CFTR inhibitor, and the potentiator Ivacaftor (VX770) were purchased from Sigma-Aldrich (Milan, Italy); GSH-sepharose™, ECL Select™ Western Blotting Detection Reagent, and Amersham ™ Protran® Premium 0.45-μm nitrocellulose were obtained from GE Healthcare (Chicago, IL, USA); Monocytes Isolation Kit II was purchased from Miltenyi Biotec Srl (Bologna, Italy); pEYFP-C1 plasmid was obtained from Clontech Laboratories (Mountain View, CA, USA); QuickChange site-directed mutagenesis kit was from Stratagene (San Diego, CA, USA); BamHI and EcoRI restriction enzymes by Fermentas were purchased from Life Technologies Italia (Monza, Italy).
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6

PBMC Isolation and Functional Assays

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Ficoll-Paque PLUS (GE Healthcare, Bio-Sciences AB, Uppsala, Sweden), Percoll, red blood cell lysis buffer, sterile-filtered PBS and HBSS, endotoxin-free water (Sigma, St.
Louis, USA) were used for PBMC isolation. Cells were resuspended in complete medium, comprising RPMI 1640 Medium with 25 Mm HEPES and L-Glutamine (Sigma, St. Louis, USA), supplemented with 1% of Non-essential Amino Acid Solution 100X and 1% Penicillin Streptomycin Solution 100X (Euroclone, Milano, Italy), and 10% FBS (Sigma, St. Louis, USA).
Apo-ONE® Homogeneous Caspase-3/7 Assay (Promega, Milano, Italy) and Cell Proliferation Kit I (MTT) (Roche, Mannheim, Germany) were used for apoptosis and viability assays, respectively. Chemotaxis and phagocytosis were measured by using Zymosan A from Saccharomyces cerevisiae and fluorescein-labelled Escherichia coli bioparticles K-12 strain (Invitrogen, Oregon, USA), respectively.
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