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. 2016 Oct 11;5(10):e375.
doi: 10.1038/mtna.2016.82.

Notch-1 Confers Chemoresistance in Lung Adenocarcinoma to Taxanes through AP-1/microRNA-451 Mediated Regulation of MDR-1

Jiayuan Huang  1   2 , Yitian Chen  2 , Junyang Li  3 , Kai Zhang  2 , Jing Chen  2 , Dongqin Chen  2 , Bing Feng  2 , Haizhu Song  2 , Jifeng Feng  1 , Rui Wang  2 , Longbang Chen  2
Affiliations

Notch-1 Confers Chemoresistance in Lung Adenocarcinoma to Taxanes through AP-1/microRNA-451 Mediated Regulation of MDR-1

VSports在线直播 - Jiayuan Huang et al. Mol Ther Nucleic Acids. .

Abstract

We previously demonstrated that expression of Notch-1 is associated with poor prognosis in lung adenocarcinoma (LAD) patients. The aim of this study is to reveal whether Notch-1 was associated with Taxanes-resistant LAD and, the underlying mechanisms. We collected 39 patients of advanced LAD treated with Taxanes and found that positive Notch-1 expression is closely related to LAD lymph node metastasis, recurrence and poorer prognosis, and Notch-1 acts as an independent poor prognostic factor in LAD by multivariate analysis with Cox regression model. Then, by using the Docetaxel (DTX)-resistant LAD cell lines that we established previously, we found that Notch-1 contributes to resistance of LAD cells to DTX in vitro, and inhibition of Notch-1 sensitizes LAD to DTX in vivo. We further demonstrated that Notch-1 mediates chemoresistance response and strengthens proliferation capacity in LAD cells partially through negative regulation of miR-451 by transcription factor AP-1. Moreover, we found that MDR-1 is a direct target of miR-451 and influences chemoresistance of LAD cells. Taken together, our data revealed a novel Notch-1/AP-1/miR-451/MDR-1 signaling axis, and suggested a new therapeutic strategy of combining DTX with Notch inhibitors to treat DTX-resistant LAD. VSports手机版.

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Figures

Figure 1
Figure 1
Notch-1 expression is increased in DTX-treated LAD and associated with poor prognosis LAD patients. (a) Notch-1 expression in surgical resection specimens by immunohistochemistry staining. (b) The Kaplan–Meier univariate analysis for the association of Higher Notch-1 expression, advanced TNM stage and poorer survival time, including disease-free survival (DFS) and overall survival (OS). (c) mRNA and (d) protein levels of Notch-1 in two parental LAD cell lines SPC-A1 and H1299 and their DTX-resistant cell lines. (e) mRNA and protein levels of Notch-1 in two parental LAD cell lines treated with DTX in different concentration (0, 3 or 5μg/l) for 48 hours. (f) mRNA and protein levels of Notch-1 in two parental LAD cell lines treated with 5 μg/l DTX for 0, 3, 5, or 7 days. Scale bar = 50 μm. *P < 0.05 and **P < 0.01. LAD, lung adenocarcinoma; mRNA, microRNA.
Figure 2
Figure 2
Notch-1 promotes proliferation and confers chemoresistance of LAD in vitro. (a) mRNA or (b) protein levels of Notch-1 in two parental LAD cell lines with transfection of Notch-1 overexpression plasmid (pcDNA3/Notch-1) and their DTX-resistant cell lines with transfection of Notch-1 short hair RNA plasmid (pGPU6/sh-Notch-1). (c) The IC50 value of DTX in two parental LAD cell lines with transfection of Notch-1 overexpression plasmid (pcDNA3/Notch-1) and their DTX-resistant cell lines with transfection of Notch-1 short hair RNA plasmid (pGPU6/sh-Notch-1). (d) Colony formation assay in two DTX-resistant cell lines with transfection of Notch-1 short hair RNA plasmid (pGPU6/sh-Notch-1) treated with 50 μg/l DTX. (e) Cell cycle analysis and (f) Cell apoptosis analysis in two DTX-resistant cell lines with transfection of Notch-1 short hair RNA plasmid (pGPU6/sh-Notch-1) treated with 50 μg/l DTX. *P < 0.05 and **P < 0.01. LAD, lung adenocarcinoma; mRNA, microRNA.
Figure 3
Figure 3
Inhibition of Notch-1 sensitizes LAD to DTX in vivo. SPC-A1/DTX and H1299/DTX cells stably interfered Notch-1 expression were subcutaneously explanted into nude mice and DTX-resistant LAD cell stable transfected with sh-control was used as normalized. (a) The xenograft tumors were obtained and measured. (b) The tumor weight of xenograft tumors. (c) The values of tumor volume after transplantation. (d) The immunohistochemistry staining of ki-67, Notch-1 and proliferating cell nuclear antigen (PCNA) in tumor samples. (e) TUNEL staining in tumor samples. Scale bar = 50 μm. *P < 0.05 and **P < 0.01. LAD, lung adenocarcinoma; TUNEL, terminal deoxynucleotidyl transferase-mediated nick end labeling.
Figure 4
Figure 4
MiR-451 participates in Notch-1 induced resistance of LAD cells to DTX. (a) The expression of miR-200b, miR-100, Let-7c, miR-650, and miR-451 in SPC-A1/DTX cells with transfection of Notch-1 short hair RNA plasmid (pGPU6/sh-Notch-1). (b) The expression of miR-451 in SPC-A1/DTX cells with transfection of Notch-1 short hair RNA plasmid (pGPU6/sh-Notch-1) and SPC-A1 cells with transfection of Notch-1 overexpression plasmid (pcDNA3/Notch-1). (c) The IC50 value of DTX in SPC-A1/DTX cells with transfection of Notch-1 short hair RNA plasmid (pGPU6/sh-Notch-1) treated with miR-451 inhibitor. (d) The apoptosis assay in SPC-A1/DTX cells with transfection of Notch-1 short hair RNA plasmid (pGPU6/sh-Notch-1) treated with miR-451 inhibitor. *P < 0.05 and **P < 0.01. LAD, lung adenocarcinoma.
Figure 5
Figure 5
MDR-1 is a direct target of miR-451 and influences chemoresistance. (a) The 3′-UTR of MDR-1 is discovered complementary binding site for miR-451. (b) The relative luciferase activity in pLUC-MDR1-3′UTR-wt or pLUC-MDR1-3′UTR-mut transfected SPC-A1/DTX cells with transfection of miR-451 overexpression plasmid (pcDNA/miR-451). (c) The mRNA and protein level of MDR-1 in SPC-A1 cells and SPC-A1/DTX. (d) The protein level of MDR-1 in SPC-A1 cells with transfection of Notch-1 overexpression plasmid (pcDNA3/Notch-1) or treatment of miR-451 inhibitor and SPC-A1/DTX cells with transfection of miR-451 overexpression plasmid (pcDNA/miR-451) or transfection of Notch-1 short hair RNA plasmid (pGPU6/sh-Notch-1). (e) The protein level of MDR-1 in SPC-A1/DTX cells treated with DAPT in different concentrations (0, 2, 5 or 10 μmol/l). (f) The protein level of MDR-1 in SPC-A1/DTX cells treated with 10 μmol/l DAPT or 10 μmol/l DAPT plus miR-451 inhibitor. *P < 0.05 and **P < 0.01. DAPT, N-[N-(3,5-difluorophenacetyl)-L-alanyl]-S-phenylglycine t-butyl ester; MDR, multidrug resistant protein-1; mRNA, microRNA.
Figure 6
Figure 6
Notch-1 negatively regulates miR-451 by AP-1. (a) There were five complementary binding sites of activator protein-1 (AP-1) in miR-451. (b) The expression of phosphorylated c-jun in SPC-A1/DTX cells treated with 10 μmol/l DAPT, transfected with Notch-1 short hair RNA plasmid (pGPU6/sh-Notch-1). GAPDH served as loading control. (c) The luciferase activity of pGL3 basic firefly luciferase reporter or pGL3-miR451 promoter in SPC-A1/DTX cells with or without transfection of c-jun overexpression plasmid (GV144/c-jun). (d) Chromatin Immunoprecipitation (ChIP) analysis for the corresponding location that c-Jun combined with miR-451 promoter. (e) The expression of miR-451 in SPC-A1/DTX cells transfected with c-jun overexpression plasmid (GV144/c-jun). (f) The protein level of MDR-1 in SPC-A1/DTX cells transfected with c-jun overexpression plasmid (GV144/c-jun) or plus miR-451 inhibitor. (g) The Notch-1/AP-1/miR-451/MDR-1 signaling axis. *P < 0.05. DAPT, N-[N-(3,5-difluorophenacetyl)-L-alanyl]-S-phenylglycine t-butyl ester; MDR, multidrug resistant protein-1; GAPDH, glyceraldehyde 3-phosphate dehydrogenase.
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