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4 protocols using sc 22760

1

Immunofluorescence Analysis of DNA Damage Markers

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Immunofluorescence analysis was performed using antibodies against γ-H2AX (1:1,000, Millipore, 05-636), phosphor-(Ser/Thr) ATM/ATR substrate (1:500, Cell Signaling Technology, 2851) and 53BP1 (1:1,000, Santa Cruz, sc-22760; 1:1,000, abcam, ab36823). DNA was stained with 2 mg ml−1 4′,6-diamidino-2-phenylindole (Dojindo). Fluorescence images were observed and photographed using an immunofluorescence microscope (Carl Zeiss)14 (link)62 (link).
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2

Immunoblotting for 53BP1 and Tubulin

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Immunoblotting was performed with total cellular extract using standard protocols. Antibodies used were rabbit anti-53BP1 (Santa-Cruz, sc-22760) and rat anti-tubulin (Abcam, ab6161).
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3

Immunofluorescence Staining of DNA Damage Markers

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After incubation with pneumolysin, cells were permeabilized with 0.2% Triton X-100 in PBS for 10 min, and blocked with 3% bovine serum albumin (BSA) in PBS for 40 min. Primary antibodies against γH2AX (Ser-139) (Millipore #05–636), 53BP1 (Santa Cruz #sc-22760), MDC1 (Abcam #1169), p53BP1 (S1778, Cell signaling #2675) were used at 1:100 dilutions in PBS, and incubated for 1 h at room temperature with cover slips. For TUNEL staining, the labeling enzyme (Roche #1 1684795 910) was incubated similarly for 1 h at 37 °C. Secondary antibodies (Invitrogen) labeled with either Alexa Fluor 488 or 564 or 647 were used. For EdU detection, Alexa Fluor azide was used in Click-iT reaction buffer (Invitrogen). Slides were mounted with SlowFade (Invitrogen) and stored at 4 °C until imaging. All stained slides were examined under confocal microscope, and 15 images (at 5 × 3 sites) were taken for each well under 40X magnification.
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4

Immunofluorescence Analysis of Cellular Senescence

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Immunofluorescence analysis was performed using antibodies against Lamin B1 (Abcam, ab16048, 1:1000 dilution), dsDNA marker (Santa Cruz, sc-58749, 1:250 dilution), γ-H2AX (Millipore, 05-636, 1:2000 dilution), phosphor-(Ser/Thr) ATM/ATR substrate (Cell Signaling Technology, 2851, 1:500 dilution), p16 (Santa Cruz, sc-468, 1:500 dilution), p21 (Abcam, ab2961, 1:50 dilution), 53BP1 (Santa Cruz, sc-22760; Abcam, ab36823, 1:500 dilution), IL-1β (Proteintech, 16806-1-AP, 1:300 dilution), IL-6 (Abcam, ab6672, 1:400 dilution), STING (Abcam, ab92605, 1:200 dilution), phospho-TBK1 (Bioss antibodies, bs-3440R, 1:100 dilution), IFN-β (Abcam, ab140211, 1:100 dilution), DNase2 (Bioss antibodies, bs-7652, 1:100 dilution), TREX1 (Novus Biologicals, NBP1-76977, 1:100 dilution) and Desmin (Thermo Fisher Scientific, MA5-13259, 1:100 dilution). DNA was stained with DAPI (Dojindo). Fluorescence images were observed and photographed using an immunofluorescence microscope (Carl Zeiss AG)11 (link),43 (link).
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