Silencing of long non-coding RNA ANRIL inhibits the development of multidrug resistance in gastric cancer cells

Lan,Wei-Guang; Xu,Dian-Hong; Xu,Chen; Ding,Chang-Ling; Ning,Fang-Ling; Zhou,Yan-Li; Ma,Long-Bo; Liu,Chang-Min; Han,Xia

doi:10.3892/or.2016.4771

Silencing of long non-coding RNA ANRIL inhibits the development of multidrug resistance in gastric cancer cells

Authors:
- Wei-Guang Lan
- Dian-Hong Xu
- Chen Xu
- Chang-Ling Ding
- Fang-Ling Ning
- Yan-Li Zhou
- Long-Bo Ma
- Chang-Min Liu
- Xia Han
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Affiliations: Department of Oncology, Affiliated Hospital of Binzhou Medical University, Binzhou, Shandong, P.R. China, The Second Department of Internal Medicine, People's Hospital of Kenli County, Kenli, Shandong, P.R. China, Department of Pharmacy, Affiliated Hospital of Binzhou Medical University, Binzhou, Shandong, P.R. China
Published online on: April 26, 2016 https://doi.org/10.3892/or.2016.4771
Pages: 263-270

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Abstract

The development of multidrug resistance (MDR) is a crucial cause of therapy failure in gastric cancer, which results in disease recurrence and metastasis. Long non-coding RNAs (lncRNAs) have been proven to be critical in carcinogenesis and metastasis of gastric cancer. However, little is known about the roles of ANRIL (antisense non-coding RNA in the INK4 locus) in gastric cancer MDR. The aim of our study is to identify the biological function of ANRIL in gastric cancer MDR. In our results, ANRIL was highly expressed in gastric cancer tissues of cisplatin-resistant and 5-fluorouracil (5-FU)-resistant patients, and the same upregulation trends were observed in cisplatin-resistant cells (BGC823/DDP) and 5-FU-resistant cells (BGC823/5-FU). In addition, BGC823/DDP and BGC823/5-FU cells transfected with ANRIL siRNA and treated with cisplatin or 5-FU, respectively, exhibited significant lower survival rate, decreased invasion capability, and high percentage of apoptotic tumor cells. The influence of ANRIL knockdown on MDR was assessed by measuring IC50 of BGC823/DDP and BGC823/5-FU cells to cisplatin and 5-FU, the result showed that silencing ANRIL decreased the IC50 values in gastric cancer cells. Moreover, qRT-PCR and western blotting revealed that ANRIL knockdown decreased the expression of MDR1 and MRP1, both of which are MDR related genes; regression analysis showed that the expression of ANRIL positively correlated with the expression of MDR1 and MRP1, resprectively In summary, knockdown of lncRNA ANRIL in gastric cancer cells inhibits the development of MDR, suggesting an efficacious target for reversing MDR in gastric cancer therapy.

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