RNA Interference Targeting Slug Increases Cholangiocarcinoma Cell Sensitivity to Cisplatin via Upregulating PUMA

International Journal of Molecular Sciences

Kejun Zhang¹  Dong Chen¹  Xingang Wang¹  Shaoyan Zhang³  Jigang Wang²  Yuan Gao⁴ 

[1] General Surgery of the Affiliated Hospital of Medical College, Qingdao University, Qingdao, Shan Dong Province 266003, China; E-Mails:;Pathology, The Affiliated Hospital of Medical College, QingDao University, Qingdao, Shan Dong Province 266003, China; E-Mail:;Laboratory of the Affiliated Hospital of Medical College, Qingdao University, Qingdao, Shan Dong Province 266003, China; E-Mail:;Molecular Biology, The Affiliated Hospital of Medical College, QingDao University, Qingdao, Shan Dong Province 266003, China; E-Mail:

关键词: cisplatin;    chemotherapy;    slug;    PUMA;    E-cadherin;   

DOI  :  10.3390/ijms12010385

来源: mdpi

【 摘 要 】

Slug is an E-cadherin repressor and a suppressor of PUMA (p53 upregulated modulator of apoptosis) and it has recently been demonstrated that Slug plays an important role in controlling apoptosis. In this study, we examined whether Slug’s ability to silence expression suppresses the growth of cholangiocarcinoma cells and/or sensitizes cholangiocarcinoma cells to chemotherapeutic agents through induction of apoptosis. We targeted the Slug gene using siRNA (Slug siRNA) via full Slug cDNA plasmid (Slug cDNA) transfection of cholangiocarcinoma cells. Slug siRNA, cisplatin, or Slug siRNA in combination with cisplatin, were used to treat cholangiocarcinoma cells in vitro. Western blot was used to detect the expression of Slug, PUMA, and E-cadherin protein. TUNEL, Annexin V Staining, and cell cycle analysis were used to detect apoptosis. A nude mice subcutaneous xenograft model of QBC939 cells was used to assess the effect of Slug silencing and/or cisplatin on tumor growth. Immunohistochemical staining was used to analyze the expression of Slug and PUMA. TUNEL was used to detect apoptosis in vivo. The results showed that PUMA and E-cadherin expression in cholangiocarcinoma cells is Slug dependent. We demonstrated that Slug silencing and cisplatin both promote apoptosis by upregulation of PUMA, not by upregulation of E-cadherin. Slug silencing significantly sensitized cholangiocarcinoma cells to cisplatin through upregulation of PUMA. Finally, we showed that Slug silencing suppressed the growth of QBC939 xenograft tumors and sensitized the tumor cells to cisplatin through PUMA upregulation and induction of apoptosis. Our findings indicate that Slug is an important modulator of the therapeutic response of cholangiocarcinoma cells and is potentially useful as a sensitizer in cholangiocarcinoma therapy. One of the mechanisms is the regulation of PUMA by Slug.

【 授权许可】

CC BY   
© 2011 by the authors; licensee Molecular Diversity Preservation International, Basel, Switzerland.