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4 protocols using ab218527

1

Protein Extraction and Western Blot Analysis

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Protein was obtained from cells with RIPA lysis buffer (Beyotime, Shanghai, China) supplied with protease inhibitors. Protein was separated through SDS-PAGE and moved to PVDF membranes (Millipore, Darmstadt, Germany). After being sealed with 5% skimmed milk, the membranes were cultivated with primary antibodies for E2F1 (ab218527, 1/1000), SYTL2 (ab231133, 1/1000), Akt (ab235958, 1/1000), p-Akt (ab81283, 1/5000), ERK (ab54230, 1/1000), p-ERK (ab201015, 1/1000) and GAPDH (ab8245, 1/1000) from Abcam (Cambridge, USA). Secondary antibodies were added for cultivating for 1 h. The amount of protein was examined via chemiluminescence detection system.
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2

Quantitative Immunoblotting of Cell Cycle Proteins

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Cells were seeded into 6 cm plates (4 × 105 cells/plate) for 48 h and the lysates were subjected to SDS-PAGE electrophoresis, transferred onto a nitrocellulose membrane, and blocked with 5% skim milk at room temperature. The membranes were incubated with primary antibodies overnight, washed with phosphate buffered saline (PBS), and incubated with anti-mouse (Abcam, ab6728) or rabbit IgG-HRP (Abcam, ab6721). The primary antibodies were as follows: E2F1 (Abcam, ab218527), AURKB (Abcam, ab24), DSN1 (Proteintech, 17,742–1-AP), CCNB2 (Abcam, ab185622), CHEK1 (Abcam, ab40866), CENPA (Abcam, ab13939), DP1 (Abcam, ab124678), β-actin (Santa Cruz Biotechnology, sc69879), and GAPDH (Proteintech, 10,494–1-AP).
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3

Cellular Protein Extraction and Immunoblotting

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Cellular protein was extracted as described previously [23 (link)]. Antibodies against E2F1 (ab218527, Abcam, Cambridge, MA, USA), TXNIP (ab188865), ASK1 (sc-5294, Santa Cruz, CA, USA) and GAPDH (sc-25778) were used. GAPDH served as the internal control. ImageJ v1.50e was used to quantify the band intensity.
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4

Immunohistochemical Analysis of Cartilage Markers

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Clinical samples were collected and processed to isolate cartilage tissues, and the tissue sections were subjected to immunohistochemical detection of KDM2A-, E2F1-, and PTTG1-positive expression rates. Antigens were retrieved from tissue sections by boiling in sodium citrate buffer. Immunohistochemistry was carried out by incubating sections with primary antibodies rabbit anti-KDM2A (ab191387; Abcam, Cambridge, UK), E2F1 (ab218527; Abcam, Cambridge, UK), and PTTG1 (ab128040; Abcam, Cambridge, UK). Normal rabbit serum was employed as NC instead of primary antibody. Next, the sections were incubated with HRP-secondary antibody and then exposed to 3,3′-diaminobenzidine (DAB) reagent prior to microscopic observation. KDM2A, E2F1, and PTTG1 expression was positive with brownish-yellow particles in chondrocytes. Specimens were scored according to the intensity of the dye color and the number of positive cells.38 (link)
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