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6 protocols using ins 1e

1

Cell Culture Protocols for Islet and Endothelial Cells

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Alpha TC1 clone 6 (ATCC Cat. No. CRL-2934, RRID:CVCL_B036), referred to as α cells (ATCC, Manassas, VA), were cultured in DMEM 6046 (Sigma-Aldrich) supplemented with 10% (v/v) fetal bovine serum (FBS; Sigma-Aldrich), 15 mM HEPES, 0.1 mM nonessential amino acids (NEAA), 1.5% (wt/vol) sodium bicarbonate, and 2.0% (wt/vol) glucose. INS-1E (RRID:CVCL_0351), referred to as β cells (AddexBio, San Diego, CA), were cultured in RPMI-1640 (Gibco) supplemented with 5% (vol/vol) FBS, 1 mM sodium pyruvate, 10 mM HEPES, and 0.05 mM 2-mercaptoethanol. Human umbilical vein endothelial cells (HUVECs) (C2519A, used at passage 5; Lonza, Walkersville, MD), were cultured in EGM-2 (PromoCell; C-22111). All cell types were negative for mycoplasma contamination (Mycoplasma Detection Kit, #B39035; BioTool) and were cultured under a humidified atmosphere with 5% CO2 at 37°C.
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2

Culturing Rat Pancreatic Beta Cells

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The rat pancreatic β-cell line INS-1E (AddexBio, San Diego, CA) passage 30–70 was cultured in RPMI-1640 media supplemented with 10% fetal bovine serum (FBS), 1% penicillin/streptomycin, 10 mM HEPES, 1 mM sodium pyruvate and 50 μM 2-mercaptoethanol. Cells were cultured in a humidified atmosphere at 37 °C with 5% CO2 in air.
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3

INS-1E Cell Culture and Treatments

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We seeded 40,000 INS-1E (AddexBio, San Diego, CA, USA) per cm2 (flasks) and cultivated these cells in medium containing RPMI 1640 with glutamine (Life Technologies, Carlsbad, CA, USA), 1 mmol/l sodium pyruvate (Life Technologies), 50 μmol/l β-mercaptoethanol (Life Technologies), 10 mmol/l HEPES (Life Technologies), 10% fetal bovine serum (FBS) (Biochrom, Berlin, Germany), 100 IU/ml penicillin and 100 μg/ml streptomycin (Life Technologies). After 4 days, INS-1E were detached using 0.05% trypsin (Life Technologies), seeded at 100,000 cells per cm2 (24- or 96-well plate) and cultured in the aforementioned medium for another 3 days. Then, cells were fasted for FBS for 4h and treated with 0.1, 1 or 5 μg/ml recombinant Sfrp5 (R&D Systems, Wiesbaden, Germany) for 24h. INS-1E cells were also incubated with 0.2 ng/ml interleukin (IL)-1β (R&D Systems) as positive control for the inhibition of cell viability. Treatment of the cells with 10 μmol/l CHIR99021 (Miltenyi Biotec GmbH, Bergisch Gladbach, Germany) served as positive control of an activated canonical Wnt signalling pathway.
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4

In Vitro Cell Culture Protocol

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Alpha TC1 clone 6 (Cat# CRL-2934 ATCC, Manassas, United States), referred to as α cells, were cultured in DMEM 6046 (Sigma-Aldrich) supplemented with 10% (vol/vol) FBS (Sigma-Aldrich), 15 mM HEPES, 0.1 mM non-essential amino acids, 1.5% (wt/vol) sodium bicarbonate and 2.0% (wt/vol) glucose. INS-1E (AddexBio, San Diego, United States), referred to as β cells, were cultured in RPMI 1640 (Gibco) supplemented with 1 mM sodium pyruvate, 0.05 mM 2-mercaptoethanol, 10 mM HEPES, and 5% (vol/vol) FBS. Human umbilical vein endothelial cells (HUVECs) (C2519A, Lonza, Maryland, United States; used at passage 5) were cultivated in EGM-2 (PromoCell). All cells were cultured under a humidified atmosphere with 5% CO2 at 37°C and negative for mycoplasma contamination (Mycoplasma Detection Kit, #B39035, BioTool).
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5

Mycoplasma-free Cellular Coculture Assay

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INS-1E (AddexBio #C0018009) and C2C12 (ATCC CRL-1772) were commercially available and therefore not authenticated following purchase. The cells were free of mycoplasma as determined by PCR.
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6

Cultivation of Clonal β-Cell Lines

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The clonal β-cell line BRIN-BD11 (Sigma-Aldrich, Cat no. 10033003) is a hybrid line formed by electrofusion of a primary culture of rat pancreatic β-cells (New England Deaconess Hospital, NEDH) with RINm5F cells [51 (link),52 (link)]. The cells were cultured in a humidified atmosphere containing 5% CO2 and at 37°C in a complete medium, composed of RPMI 1640 medium supplemented with 10% heat-inactivated fetal bovine serum (FBS), 2 mM l-glutamine, 10 mM HEPES, 100 U ml−1 penicillin and 100 U ml−1 streptomycin.
The rat clonal β-cell line INS-1E [53 (link)] (AddexBio, Cat no. C0018009) derived from parental INS-1 cells [54 (link)] was cultured in a humidified atmosphere containing 5% CO2 and at 37°C in a complete medium, composed of RPMI 1640 medium supplemented with 10% heat-inactivated FBS, 1 mM sodium pyruvate, 50 mM 2-mercaptoethanol, 2 mM l-glutamine, 10 mM HEPES, 100 U ml−1 penicillin and 100 U ml−1 streptomycin.
Mouse insulinoma-derived MIN6 cells were a kind gift from the Miyazaki laboratory, Osaka University, Japan [55 (link)] and were cultivated in a complete medium, composed of DMEM high glucose medium, supplemented with 10% heat-inactivated FBS, 50 mM 2-mercaptoethanol, 2 mM l-glutamine, 100 U ml−1 penicillin and 100 U ml−1 streptomycin.
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