Tumor Biology

, Volume 37, Issue 10, pp 13177–13184 | Cite as

Curcumin inhibits cell growth and induces cell apoptosis through upregulation of miR-33b in gastric cancer

  • Qianqian Sun
  • Wenjing Zhang
  • Yanjie Guo
  • Zhuyao Li
  • Xiaonan Chen
  • Yuanyuan Wang
  • Yuwen Du
  • Wenqiao Zang
  • Guoqiang ZhaoEmail author
Original Article


In this work, the in vitro experiments about biological mechanisms of curcumin were conducted using the gastric cancer cell lines SGC-7901 and BGC-823. After 24-h exposure to curcumin at the concentrations of 5, 10, 15, 20, and 40 μmol/L, two cells showed the decreased proliferation and increased apoptosis abilities. Real-time PCR, Cell Counting Kit-8 (CCK-8) assay, western blotting, and cell apoptosis assay were used to further study the underlying mechanisms of curcumin. The first stage of our studies showed that curcumin affected the expression of miR-33b, which, in turn, affected the expression of the X-linked inhibitor of apoptosis protein (XIAP) messenger RNA (mRNA). Next, curcumin was also identified to regulate the proliferation and apoptosis of SGC-7901 and BGC-823 cells. Further bioinformatics analysis and luciferase reporter assays proved that XIAP was one of the target genes of miR-33b. In the next stage, SGC-7901 and BGC-823 cells were treated with 20 μL curcumin, miR-33b mimics, and small interfering RNA (siRNA) of XIAP, respectively. The results showed that curcumin had similar effects on cell growth and apoptosis as the upregulation of miR-33b and the upregulation of the siRNA of XIAP. The results that followed from the restore experiments showed that curcumin affected cell growth and apoptosis presumably by upregulating the XIAP targeting in gastric cancer. Collectively, our results indicate that curcumin-miR-33b-XIAP coupling might be an important mechanism by which curcumin induces the apoptosis of SGC-7901 and BGC-823 cells.


Curcumin miR-33b XIAP Proliferation Apoptosis Gastric cancer 



The authors are grateful to all staff at the study center that contributed to this study. This study was supported by a grant from the Education Agency of Henan (No. 13A310671).

Compliance with ethical standards

Conflicts of interest



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Copyright information

© International Society of Oncology and BioMarkers (ISOBM) 2016

Authors and Affiliations

  • Qianqian Sun
    • 1
  • Wenjing Zhang
    • 2
  • Yanjie Guo
    • 3
  • Zhuyao Li
    • 3
  • Xiaonan Chen
    • 1
  • Yuanyuan Wang
    • 1
  • Yuwen Du
    • 1
  • Wenqiao Zang
    • 1
  • Guoqiang Zhao
    • 1
    • 4
    Email author
  1. 1.School of Basic Medical SciencesZhengzhou UniversityZhengzhouChina
  2. 2.School of Basic MedicineHenan University of Traditional Chinese MedicineZhengzhouChina
  3. 3.School of Clinical Medicine, Zhengzhou UniversityZhengzhouChina
  4. 4.Collaborative Innovation Center of Cancer ChemopreventionZhengzhouChina

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