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3 protocols using d hanks solution

1

Rat DRG Neuron Isolation Protocol

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The DRG tissues were dissected and incubated with D-Hanks solution (Beyotime Institute of Biotechnology, Shanghai, China). The mixture was digested with 0.25% trypsin (Beyotime Institute of Biotechnology) at 37°C for 20 min. A pipette was used to mix 20 ml Dulbecco’s modified Eagle’s medium with Ham’s F-12 (DMEM/F12; Gibco; Thermo Fisher Scientific, Inc.) in a proportion of 1:1, and fetal bovine serum (FBS; Sigma-Aldrich; Merck KGaA) was then added into the mixture to stop the digestion process. Then, the cell suspension was collected. The suspension was centrifuged at 224 × g for 15 min, and the supernatant was discarded. A total of 10 ml DMEM/F12 was added into the precipitate. The cell debris and residual tissues were sunk, and the cell suspension was collected. Cells were seeded into a polylysine pre-coated culture flask (75 cm2, 250 ml) and placed in an incubator with 5% CO2 at 37°C. After 48 h, the cells that attached on the pre-coated flask were rat DRG neurons.
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2

Modeling Ischemia-Reperfusion Injury in H9C2 Cells

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The D-galactose induction was conducted as previously described (18 (link)). D-galactose (10 g/l) was added to H9C2 cells for 48 h at 37°C. Hypoxic conditions were produced using D-Hank's solution (Beyotime Institute of Biotechnology) saturated with 95% N2 and 5% CO2 at 37°C. The pH was regulated to 6.8 using lactate to mimic ischemic conditions. Aged H9C2 cells were put into a hypoxic incubator which was equilibrated with 1% O2, 5% CO2 and 94% N2 at 37°C. Following the hypoxia period, the culture medium was rapidly replaced with fresh DMEM with 10% FBS (normoxic culture solution) to mimic reoxygenation.
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3

Isolation and Culture of Chondrocytes

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The suppliers and the catalog numbers of the reagents are as follows. Dulbecco’s modified Eagle’s medium (DMEM) (Life Technologies, Carlsbad, CA, United States ; 22,400–089), fetal bovine serum (Life Technologies; 10,099), antibiotic-antimycotic (Life Technologies; 15,240–112), phosphate-buffered saline (PBS) (Life Technologies; 10010-049, pH7.4), trypsin-EDTA (Life Technologies; 25300-054, 0.05%), bovine serum albumin (Life Technologies; 15560012); D-Hanks solution (Beyotime, Jiangsu, China; C0218); type II collagenase (Sigma, St. Louis, MO, United States ; C6885); 5-bromo-2'-deoxyuridine (5-BrdU) (Sigma; B5002); Cell Counting Kit-8 (CCK-8; DOJINDO, Kumamoto, Japan; CK04), IRDye 680CW (Licor, Lincoln, NE, United States ), protein molecular weight markers (Beyotime; P0066), BCA protein concentration determination kit (Solarbio, Beijing, China; PC0020). Antibodies: anti-glycogen synthase kinase beta (GSK3β) (Cell Signaling Technology (CST), Danvers, MA, United States ; 12,456), anti-AKT serine/threonine kinase 1 (AKT1) (CST; 2,967), anti-AKT serine/threonine kinase 2 (AKT2) (CST; 2,962), anti-β-catenin (Abcam, Cambridge, MA, United States ; ab24925), and anti-glyceraldehyde-3-phosphate dehydrogenase (GAPDH) (Abbkine, Wuhan, China; Abp57259).
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