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Ca2 mg2 free phosphate buffered saline

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Ca2+/Mg2+-free phosphate buffered saline (PBS) is an isotonic buffer solution used to maintain the pH and osmolarity of cell cultures and other biological samples. It serves as a basic medium for dilution, washing, and suspending cells without affecting their viability or function.

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5 protocols using ca2 mg2 free phosphate buffered saline

1

Murine Bone Marrow-derived Macrophage Isolation

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To obtain murine bone marrow-derived macrophages (BMDMs), marrow was flushed from the femurs and tibia of mice, and the hematopoietic stem cells were allowed to differentiate for 7 days in Dulbecco’s modified Eagle medium (DMEM) (Gibco) supplemented with 10% fetal bovine serum (FBS) (Gibco), 1% penicillin-streptomycin (Pen-Strep) solution (Gibco), and 20% L929 conditioned medium. After 7 days, the BMDMs were harvested using Ca2+/Mg2+-free phosphate-buffered saline (PBS) (Gibco) containing 5 mM EDTA (Invitrogen, Life Technologies), and maintained in DMEM containing 10% FBS and 10% L929 conditioned medium after infection. Immortalized BMDMs (iBMDMs) were immortalized by infection with the J2 retrovirus (BEI Resources). RAW 264.7 and THP-1 cells were obtained from American Type Tissue Collection (ATCC) and were maintained in DMEM and RPMI 1640, respectively, with 10% FBS. THP-1 differentiation was induced using 20 ng/ml phorbol 12-myristate 13-acetate (PMA) (Sigma) for 18 to 20 h.
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2

Isolating and Culturing Chicken Embryonic Stem Cells

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The area pellucida was isolated from Stage X (EG&K) embryos of Hyline chicken (Gallus gallus) as previously described [33 ], washed twice with DMEM/F-12 medium (Gibco, Carlsbad, CA) and dispersed gently using a 1000-μl pipette into a single cell suspension. The cells were centrifuged at 350× g for 5 min, the supernatant was removed, and cells were resuspended in complete E8 medium (Gibco) containing 100 U/ml penicillin and 100 μg/ml streptomycin (Gibco). The cells were seeded at a density of 2 × 104 cells/cm2 in Vitronectin (Gibco)-coated culture plates (Costar, Corning, NY). When cells grew to 70–80% confluence, passaging was performed by washing and pipetting the cells with Ca2+/Mg2+-free phosphate buffered saline (PBS; Gibco).
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3

Isolation and Culture of Human Bone Marrow-Derived Mesenchymal Stem Cells

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Bone marrow aspirates were obtained by percutaneous direct aspiration from the iliac crest of 5 healthy volunteers at University Hospital Virgen de la Arrixaca (Murcia, Spain). Bone marrow was collected with 20 U/ml sodium heparin, followed by a Ficoll density gradient-based separation by centrifugation at 540 g for 20 min. After, mononuclear cell fraction was collected, washed twice with Ca2+/Mg2+-free phosphate buffered saline (PBS) (Gibco Invitrogen) and seeded into 175-cm2 culture flasks (Nunc, Thermo Fisher Scientific) at a cell density 1.5 × 105 cells/cm2 in serum-containing media, composed of DMEM low glucose medium (Thermo Fisher Scientific) supplemented with 10% fetal bovine serum (FBS; Lonza), 1% GlutaMAX (Thermo Fisher Scientific), non-essential amino acid solution (Sigma-Aldrich) and 1% penicillin/streptomycin (Thermo Fisher Scientific). After 3 days of culture at 37 °C and 7% CO2, non-attached cells were removed and fresh complete medium was added. Culture media were renewed every 2 days, and the isolated hBMSCs were passaged when cultures were 70–80% confluent. All studies were performed using hBMSCs expanded within culture passages 3–4.
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4

Pancreatic Islet Cell Isolation and Culturing

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The pancreatic islets were isolated as described previously [26 (link)] and cultured in RPMI 1640 (Invitrogen/GIBCO, Grand Island, NY, USA) with glucose 2 g/L supplemented with 10% fetal bovine serum (FBS; Invitrogen/GIBCO), 100 IU/mL penicilin-100 μg/mL streptomycin (Invitrogen/GIBCO) and glutamine (2 mmol/L; Invitrogen/GIBCO) at 37℃ in a humidified air atmosphere containing 5% CO2. Some islets immediately adhered to the surfaces of the flasks. Within several days, a monolayer of cells was observed growing out and away from the islets and after 13 to 15 days of culturing, cells in the monolayer reached to 70% confluency and named as passage zero (P0) cells. For passaging, the cells were washed with Ca2+-Mg2+ free phosphate-buffered saline (PBS) (Invitrogen/GIBCO) and detached by incubating with 0.25% trypsin-ethylenediaminetetraacetic acid solution (Invitrogen/GIBCO) for 5–10 minutes at 37℃. After addition of growth medium to inactivate trypsin, the cells were then centrifugated at 200 g for 10 minutes, resuspended in 1 mL complete medium, counted in duplicate using Thoma chamber and then plated in 75 cm2 flasks (BD Biosciences, San Diego, CA, USA) at densities of 1×106 cells/flask. The growth medium was replaced every 3 days over a 10–14 day period.
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5

Isolation and Expansion of hMB-MSCs

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A standard protocol for the isolation and expansion of hMB-MSCs was used as previously described [40 (link)]. Bone marrow aspirates were obtained by percutaneous direct aspiration from the iliac crest of 5 healthy volunteers at University Hospital Virgen de la Arrixaca (Murcia, Spain). Bone marrow was collected with 20 U/ml sodium heparin, followed by Ficoll density gradient-based separation by centrifugation at 540 g for 20 min. After, the mononuclear cell fraction was collected, washed twice with Ca2+/Mg2+-free phosphate buffered saline (PBS) (Gibco Invitrogen) and seeded into 175-cm2 culture flasks (Nunc, Thermo Fisher Scientific) at a cell density of 1.5 × 105 cells/cm2 in serum-containing media (designated as the basal media), composed of DMEM low glucose medium (Thermo Fisher Scientific) supplemented with 10% fetal bovine serum (FBS; Lonza), 1% GlutaMAX (Thermo Fisher Scientific), nonessential amino acid solution (Sigma‒Aldrich) and 1% penicillin/streptomycin (Thermo Fisher Scientific). After 3 days of culture at 37 °C and 7% CO2, nonadherent cells were removed, and fresh complete medium was added. Culture media were renewed every 2 days, and the isolated hMB-MSCs were passaged when cultures were 70–80% confluent. All studies were performed using hMB-MSCs expanded within culture passages 3–4.
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