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4 protocols using rabbit anti sirt1 polyclonal antibody

1

Acetylation Analysis of p53 Protein

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Cells were lysed in Cell Disruption Buffer (Ambion) containing inhibitors of proteases and phosphatases (Complete and PhosSTOP, Roche); samples to be analyzed for p53 acetylation were supplemented with 10 mM nicotinamide (Sigma-Aldrich) to inhibit deacetylases. Samples were analyzed with a Bradford protein assay (Bradford, 1976 (link)), balanced for total protein and subjected to SDS-PAGE followed by electrotransfer to nitrocellulose membrane (GE Healthcare). Blots were saturated in non-fat milk (Euroclone) and incubated with rabbit anti-GAPDH antibody (Genetex), rabbit anti-β-actin polyclonal antibody (Sigma-Aldrich), rabbit anti-acetylated p53 antibody (Lysine-382, Cell Signaling), goat anti-p53 polyclonal antibody, and rabbit anti-SIRT1 polyclonal antibody (both from Santa Cruz Biotechnology) followed by horseradish peroxidase-conjugated secondary antibodies (Pierce or GE Healthcare). Immunoreactive bands were detected using Femto (Pierce) or LiteAblot Turbo (Euroclone) chemiluminescence reagent and a digital imager (BioRad ChemiDoc XRS or Cambridge UVTEC).
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2

Resveratrol Modulation of SIRT1 in Cell Senescence

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Ang II, MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide), polyclonal rabbit anti-β-actin antibody, resveratrol, SA β-galactosidase staining kit, sirtinol, and whey protein (W1500) were obtained from Sigma-Aldrich Co. (USA). The β-galactosidase enzyme assay kit and luciferase assay system were obtained from Promega (USA). Rabbit anti-SIRT1 polyclonal antibody and horseradish peroxidase (HRP)-conjugated IgG were obtained from Santa Cruz Biotechnology (USA).
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3

Immunohistochemical Analysis of Oral Cancer

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IHC was conducted to detect protein expression in paraffin-embedded oral squamous cell carcinoma specimens. The slides were stained with rabbit anti-SIRT1 polyclonal antibody (1:25 Santa Cruz Biotechnology, Santa Cruz, CA, USA) and goat anti-Smad4 polyclonal antibody (1:100, Santa Cruz Biotechnology) using an automatic slide stainer BenchMark XT (Ventana Medical Systems; Tucson AZ, USA). Hematoxylin was used as the counterstain. Two independent pathologists evaluated each slide under a light microscope. Immunoreactivity was classified by estimating the percentage (P) of tumor cells exhibiting characteristic staining (from an undetectable level, 0%, to homogeneous staining, 100%) and by estimating the intensity (I) of staining (1, weak staining; 2, moderate staining; 3, strong staining). Results were scored by multiplying the percentage of positive cells by the intensity (i.e. quick score Q = P x I; maximum = 300) [98 (link)].
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4

Quantifying SIRT1 Expression in OSCC

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Immunohistochemical staining was performed to detect protein localization and expression in paraffin-embedded OSCC specimens. The sections were stained with rabbit anti-SIRT1 polyclonal antibody (1:1000; Santa Cruz Biotechnology, Santa Cruz, CA, USA) and goat anti-rabbit polyclonal antibody (1:5000; Santa Cruz Biotechnology), using an automatic slide stainer BenchMark XT (Ventana Medical Systems, Tucson, AZ, USA). Hematoxylin was used as the counterstain. Sections were evaluated using a microscope (Nikon, Tokyo, Japan) by one of the authors.
At higher magnification (×400), five visual fields were selected randomly, the expression positive signal was analyzed using Image-proplus software. SIRT1 protein levels in OSCC tissue and adjacent normal epithelium specimens were compared in accordance with the integral optical density (IOD) as a parameter for semiquantitative detection.
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