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UPregulated single-stranded DNA-binding protein 1 induces cell chemoresistance to cisplatin in lung cancer cell lines

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Abstract

Cisplatin and its analogues are widely used as anti-tumor drugs in lung cancer but many cisplatin-resistant lung cancer cases have been identified in recent years. Single-stranded DNA-binding protein 1 (SSDBP1) can effectively induce H69 cell resistance to cisplatin in our previous identification; thus, it is necessary to explore the mechanism underlying the effects of SSDBP1-induced resistance to cisplatin. First, SSDBP1-overexpressed or silent cell line was constructed and used to analyze the effects of SSDBP1 on chemoresistance of lung cancer cells to cisplatin. SSDBP1 expression was assayed by real-time PCR and Western blot. Next, the effects of SSDBP1 on cisplatin sensitivity, proliferation, and apoptosis of lung cancer cell lines were assayed by MTT and flow cytometry, respectively; ABC transporters, apoptosis-related genes, and cell cycle-related genes by real-time PCR, and DNA wound repair by comet assay. Low expression of SSDBP1 was observed in H69 cells, while increased expression in cisplatin-resistant H69 cells. Upregulated expression of SSDBP1 in H69AR cells was identified to promote proliferation and cisplatin resistance and inhibit apoptosis, while downregulation of SSDBP1 to inhibit cisplatin resistance and proliferation and promoted apoptosis. Moreover, SSDBP1 promoted the expression of P2gp, MRP1, Cyclin D1, and CDK4 and inhibited the expression of caspase 3 and caspase 9. Furthermore, SSDBP1 promoted the DNA wound repair. These results indicated that SSDBP1 may induce cell chemoresistance of cisplatin through promoting DNA repair, resistance-related gene expression, cell proliferation, and inhibiting apoptosis.

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Author Contributions

Conception and design: Zhao Xiang; Collection and assembly of data: He Rong and Liu Yu; Data analysis and interpretation: Wu Yongka and Kang Leitao; Manuscript writing: Zhaoxiang; Final approval of manuscript: All authors.

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Authors and Affiliations

  1. Department of Thoracic Surgery, Cancer Hospital of China Medical University, Liaoning Cancer Hospital & Institute, 44 Xiaoheyan Road, Dadong Region, Shenyang, 110042, Liaoning, China

    Xiang Zhao, Rong He, Yu Liu & Yongkai Wu

  2. Basic Medical Department, Central South University, Changsha, 410000, China

    Leitao Kang

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  1. Xiang Zhao
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  2. Rong He
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  3. Yu Liu
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  4. Yongkai Wu
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  5. Leitao Kang
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Correspondence to Xiang Zhao.

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Zhao, X., He, R., Liu, Y. et al. UPregulated single-stranded DNA-binding protein 1 induces cell chemoresistance to cisplatin in lung cancer cell lines . Mol Cell Biochem 431, 21–27 (2017). https://doi.org/10.1007/s11010-017-2970-8

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  • DOI: https://doi.org/10.1007/s11010-017-2970-8

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