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6 protocols using sc365546

1

DNA Double-Strand Break Quantification

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CC cells were seeded in 8-well chambers (Ibidi, Germany) at a density of 3000 /well. And CC cells were treated with 6 μg/ml CDDP for 1 h for DNA double-strand break staining (γH2AX fluorescence). Target cells were then fixed with 4% polyformaldehyde for 30 min, permeabilized with 0.1% TritonX-100 for 10 min and blocked with 10% BSA for 1 h at room temperature. Blocked cells were incubated overnight with primary antibodies against CEBPD (1:25; sc365546; Santa Cruz), IPO4 (1:50; ab181037; Abcam), γH2AX (1:50; ab2839; Abcam) at 4 °C and then labeled with Alexa Fluor-594-conjugated secondary antibody (1:200) for 1 h at room temperature. While the nuclei were stained for 2 min with DAPI (Sigma, USA). Confocal microscopy (LSM 510, META Laser scanning microscope, Zeiss) was used to acquire images. γH2AX fluorescence was quantitated using ImageJ (NIH, Bethesda, MD).
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2

Immunoprecipitation of CEBPD and IPO4

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Protein A/G beads were added to the cell lysate with three washes, then beads-lysate complexes were mixed with anti-CEBPD (10 μg; sc-365546; Santa Cruz) or anti-IPO4 antibodies (10 μg; ab181037; Abcam) and rotated overnight at 4 °C with IgG (Abcam, ab172730) as a negative control. Immunoprecipitates were then collected by centrifugation at 3000 × g for further western blotting.
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3

ChIP-qPCR Analysis of CEBPD-miR-429 Axis

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A SimpleChIP Enzymatic Chromatin IP Kit (Cell Signaling) was used for chromatin immunoprecipitation (ChIP) assay. Briefly, fragmented cross‐linked chromatin extracted from cells was immunoprecipitated with primary antibody against CEBPD (Santa Cruz, sc‐365546) and protein G magnetic beads at 4°C. Afterwards, the precipitated DNA was purified from the antibody/protein G complex and was subjected to quantitative RT‐PCR under the thermal cycle: 3 min at 95℃, followed by 40 cycles of 95℃ for 15 s and 60℃ for 1 min. The primers targeting CEBPD‐responsive element binding site on the hsa‐miR‐429 promoter were shown as below: forward: 5′‐GGTTCTTCCCTGGGCTTC‐3′; reverse: 5′‐AGTGTTAGAGTCAAGCTGGGAAAT‐3′.
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4

ChIP Assay Protocol for CEBPD and PRKDC

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ChIP assays were done as previously reported [55 (link)]. Antibodies against CEBPD (1:25; sc365546; Santa Cruz) and PRKDC (1:1000; ab32566; Abcam) were used for IP. The primers were listed in Supplementary Table 2.
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5

Western Blot Analysis of PRKDC and IPO4

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Western blot was performed as previously described [53 (link)]. Antibodies used were rabbit-anti-PRKDC (1:1000; ab32566; Abcam), anti-IPO4(1:1000; ab181037; Abcam), anti-Tubulin (1:3000; ab0049; Abways), anti-laminB (1:5000; ab0054; Abways), mouse anti-CEBPD (1:500; sc365546; Santa Cruz). Notably, PRKDC (450KD) protein was used 6% precast gels with some modifications. Boiling cell lysates were resolved on 6 % precast gels at 150 v for 40 min, then were transferred to a PVDF membrane (Millipore Sigma) using eBlot ® L1 wet transfer system (GenScript, Piscataway, NJ) for 15 min. While others (30–130KD) were used 10% precast gels at 150 v for 40 min and transferred with eBlot ® L1 wet transfer system for 11 min. The Thermo Scientific NE-PER Nuclear and Cytoplasmic Extraction Kit were used to extract the separate cytoplasm and nuclear. Cytoplasmic and nuclear fractionation was done according to the methods described [56 (link)]. Quantitative analysis of protein concentration was calculated using ImageJ (National Institutes of Health).
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6

Protein Expression Analysis of CRC CAF Genes

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The protein expressions of these CAF signature genes in CRC tissues were analyzed in HPA online database (https://www.proteinatlas.org/), which aims to create a human proteome-wide map through integrated omics technologies [55 (link)].
For markers that are not available in HPA database, IHC will be further applied to examine the protein expression patterns in CRC samples who underwent radical rectal resection in Peking University First Hospital. The research was approved by ethics committee of Peking University First Hospital, and written informed consent was obtained from all subjects. Formalin-fixed paraffin-embedded surgical CRC specimens were collected and incubated with primary antibodies against CEBPD (sc-365546, Santa Cruz Biotechnology Inc., 1:200 dilution) and CXCL1 (ab89318, abcam, 1:200 dilution)) overnight at 4 °C, followed by incubation with secondary antibody (PV-9000, Beijing ZSGB-BIO) at room temperature for 30 min. Then, diaminobenzidine tetrachloride (DAB) staining (10 min at room temperature; ZLI-9019; Beijing ZSGB-BIO) was applied for CEBPD and CXCL1 expressions visualizations.
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