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3 protocols using recombinant human insulin solution

1

Insulin-Based Diabetic Model Development

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Recombinant human insulin solution (10 mg/mL in 25 mM hydroxyethyl piperazineethanesulfonic acid (HEPES) at pH 8.2; activity, 27 units/mg), fluorescein-5-isothiocyanate (FITC), dimethylsulfoxide, streptozotocin, and chitosan (low molecular weight, 50–190 kDa, 75% deacetylation) were obtained from Sigma-Aldrich (Poole, UK). Heparin sodium salt was provided by AppliChem (Darmstadt, Germany). Poly(ethylene) glycol (PEG) 6000 was purchased from BDH Laboratory Supplies (Poole, UK).
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2

Adenovirus-Mediated Protein Flux Analysis

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Adenovirus encoding CMV promoter-driven GFP:Cre or GFP alone were purchased from Vector Biolabs. Adenovirus encoding mRFP-GFP tandem fluorescent-tagged LC3 (tfLC3) reporter was kindly provided by Dr. Qiangrong Liang (23). Recombinant human insulin solution was purchased from Sigma, whereas recombinant human IGF-1 was from PeproTech. Bafilomycin A1 was from Cell Signaling Technology. Rabbit anti-p62 (#23214), rabbit anti-LC3A/B (#12741), rabbit anti-Ulk1 (#8054), rabbit anti-IGF1Rβ (#9750), rabbit anti-GAPDH (#5174) were purchased from Cell Signaling Technology. Rabbit anti-IRβ (#sc-711) was from Santa Cruz. Mouse anti-GFAP (#MAB306) and mouse anti-NeuN (#MAB377B) were purchased from Millipore. Rabbit anti-GFAP (#ab7260) was purchased from Abcam. Rabbit anti-Iba-1 (#019-19741) was purchased from Fujifilm-Wako. HRP-conjugated goat-anti-rabbit IgG secondary antibodies were purchased from GE Healthcare.
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3

PCP-R Cell Culture Protocol

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PCP-R cell culture was performed as described previously [13] , with the following modifications. The cells were cultivated in DMEM containing 4.5 gl -1 glucose, pyruvate, and phenol red (GlutaMAX™, Gibco by Life Technologies, Carlsbad, USA) and supplemented with 10% (v/v) fetal calf serum (FCS; Gibco by Life Technologies, Carlsbad, USA), 2% (v/v) Penicillin-Streptomycin (P/S; 5000 U ml -1 stock; Gibco by Life Technologies, Carlsbad, USA), 2.4% (v/v) HEPES (1 M stock; Lonza, Basel, Switzerland), 0.05% (v/v) recombinant human insulin solution (10 mg ml -1 stock; Sigma-Aldrich, St. Louis, MO, USA). This medium composition will be referred to as 10% FCS PCP-R medium.
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