SEMA3C silencing inhibits CRPC cell growth and induces apoptosis

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SEMA3C silencing inhibits CRPC cell growth and induces apoptosis SEMA3C silencing inhibits CRPC cell growth and induces apoptosis DU145 cells transfected with siScr, siSEMA3C‐1, or siSEMA3C‐2 siRNA. SEMA3C silencing was confirmed by immunoblotting using SEMA3C Abs. The effect of SEMA3C silencing on EGFR signaling is shown by immunoblotting with phospho‐specific Abs for EGFR, HER2/ErbB2, MET, SHC, AKT, SRC, and MAPK. The data are representative of independent experiments repeated four times.DU145 cells transfected with siScr, siSEMA3C‐1, or siSEMA3C‐2 and cultured in medium containing 10% FBS for 72 h. Apoptosis was demonstrated by immunoblotting with cleavage‐specific PARP and caspase‐3 Abs and with PARP Abs that recognizes both native (116 kDa) and cleaved (89 kDa) PARP. Vinculin is shown as loading control. The data are representative of three independent experiments.24 h after transfection with siScr, siSEMA3C‐1, or siSEMA3C‐2, DU145 cells were treated ±1 μM SEMA3C:Fc and cell growth was determined at 48 h using PrestoBlue proliferation assay. Data represent the mean ± SEM of triplicate. Inset shows SEMA3C expression level in cells after 48 h in culture.EGFR, MET, and downstream SHC phosphorylation in DU145 cells treated with Plexin B1 siRNA. Plexin B1 knockdown and vinculin levels are shown as controls. Data are representative of four independent experiments.Relative SEMA3C mRNA levels in C4‐2 cells transfected with mock (control), scrambled oligonucleotides (Scr), or SEMA3C ASO at the indicated doses (nM). Bars represent the mean relative quantity (RQ) mRNA ± SEM from samples performed in biological triplicate each analyzed in triplicate.SEMA3C ASO induces dose‐ and sequence‐specific silencing of SEMA3C. C4‐2 cells were transfected with mock, Scr, or SEMA3C ASO at the indicated doses (nM). SEMA3C expression levels were determined by immunoblot analyses.The growth (%) of C4‐2 cells transfected with Scr versus SEMA3C ASO at the indicated doses (nM) was assayed in triplicate at day 3 using the CyQUANT proliferation assay. Data represent the mean cell growth ± SEM expressed as percentage of control on day 0, **P < 0.005. Statistical analysis was performed using the unpaired two‐tailed Student's t‐test (assayed in triplicate).Levels of EGFR, SHC, and MAPK phosphorylation were determined by immunoblot analyses of cell lysates from C4‐2 cells transfected with either mock, Scr, or SEMA3C ASO at the indicated concentrations (nM). Data are representative of three independent experiments.LNCaP cells transfected with either Scr or SEMA3C ASO (100 nM) were cultured ± SEMA3C:Fc. Growth (%) was assayed by PrestoBlue proliferation assay. Bars represent relative growth FI (fluorescence intensity) after 48 h relative to day 0. Data represent the mean cell growth ± SEM of control ScrASO versus control SEMA3CASO, **P = 0.0062; control ScrASO versus SEMA3C‐treated ScrASO, *P = 0.0423; and control SEMA3CASO versus SEMA3C‐treated SEMA3CASO, **P = 0.004 (upper panel). Statistical analysis was performed using the unpaired two‐tailed Student's t‐test. Immunoblot showing the rescue of EGFR phosphorylation and SEMA3C ASO knockdown (lower panel).C4‐2 cells were treated with either Scr or SEMA3C ASO at the indicated doses. Bars represent the percentage of cells in the sub‐G1 population (mean ± SEM) from triplicate samples as determined by PI staining and flow cytometric analysis.Apoptosis was assessed by immunoblotting with Abs to cleaved PARP, cleaved caspase‐3, and actin on cell lysates from C4‐2 cells 72 h after transfection with either oligofectamine, Scr, or SEMA3C ASO. Source data are available online for this figure. James W Peacock et al. EMBO Mol Med. 2018;emmm.201707689 © as stated in the article, figure or figure legend