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2 protocols using sodium pyrophosphate

1

Western Blot Analysis of T Cell Subsets

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CD4+CD45RA+ cells were plated at 2 × 106 cells per condition for Western blotting. The cells were lysed with lysis buffer containing 2.5 mM sodium pyrophosphate, 1 mM NA3VO4, and 1 mM phenylmethylsulfonyl fluoride (Santa Cruz Biotechnology). The cell lysates were resolved with 5–15% gradient SDS-PAGE (Bio-Rad) and transferred to polyvinylidene difluoride (PVDF) membranes. The membranes were blocked with 5% milk in TBS (20 mM Tris and 500 mM NaCl) and 0.1% Tween 20 at room temperature for 1 h followed by overnight incubation at 4°C with primary Abs against IL-1RI (Abcam), IRF4 (Santa Cruz Biotechnology), RORc (Abcam), β-actin (Sigma-Aldrich). Secondary HRP-conjugated Ab (Santa Cruz Biotechnology) was added at a dilution of 1/2000 for 1 h and the protein bands were detected with an ECL Detection System (Santa Cruz Biotechnology).
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2

Molecular Profiling of SIRT1 and AMPK

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Cell culture reagents were purchased from Lonza (Basel, Switzerland) and Gibco-BRL (Grand Island, NY). General laboratory chemicals were purchased from Sigma-Aldrich (St. Louis, MO, USA) and Carlo Erba (Milano, Italy).
Ripa Lysis Buffer System, Protease Inhibitor Cocktail, Phosphatase Inhibitor Cocktail C, phenyl-methane-sulfonyl-fluoride (PMSF), Sodium Orthovanadate and Sodium Pyrophosphate were obtained from Santa Cruz Biotechnology (California, USA). CellTiter-Blue Cell Viability Assay was purchased from Promega (Madison, USA).
Reagents, protein markers and membrane for Western Blot were from Biorad Laboratories (California, USA), Rabbit polyclonal antibody against SIRT1 (H-300, sc-15404), mouse monoclonal antibody against Actin (C-2, sc-8432), goat anti-rabbit IgG-HRP antibody (sc-2004) and goat anti-mouse IgG-HRP antibody (sc-2005) were purchased from Santa Cruz Biotechnology (California, USA).
Rabbit polyclonal antibody against Phosho-AMPKα (Thr172, #2531), rabbit polyclonal antibody against Total AMPKα (#2532) were from Cell Signaling Technologies (Massachussets, USA). Luminata Crescendo Western HRP Substrate for chemiluminescent detection of bands were from Millipore (Massachussets, USA).
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