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Tumor Biology

, Volume 35, Issue 12, pp 11939–11947 | Cite as

Expression of the ELAV-like protein HuR in the cytoplasm is associated with endometrial carcinoma progression

  • Dandan Wang
  • Min Wang
  • Chang’e Hu
  • Ting Shuang
  • Yingying Zhou
  • Xiaoyu Yan
Research Article

Abstract

Human antigen R (HuR) is an mRNA-binding factor that belongs to the embryonic lethal abnormal vision/Hu protein family which may function as a tumor maintenance gene in a variety of carcinomas. However, there is no study to analyze HuR expression in endometrial carcinoma. Here, we investigated the expression of HuR in endometrial carcinoma carcinogenesis and subsequent progression. The expression of HuR and estrogen receptor alpha (ER-α) protein was examined by immunohistochemistry on paraffin embedding specimens containing endometrial carcinoma and adjacent non-cancerous tissues. Short hairpin RNA against HuR was transfected to investigate the role of HuR in regulating the expression of ER-α and progression in endometrial carcinoma. Cell viability and cycle were measured using 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) and flow cytometry, respectively. Apoptosis was examined by annexin V apoptosis assay. Our study result show that cytoplasmic HuR expression is more frequent in poorly differentiated carcinomas (p = 0.005), advanced stage (p = 0.020), and positive ER-α expression (p = 0.026). Three HuR short hairpin RNAs (shRNAs) were transfected into Ishikawa cells, and we selected the most effective shRNA for the following experiments. After the transfection, the ER-α protein level was decreased. Further, decreased expression of HuR resulted in the inhibition of proliferation and induced apoptosis in Ishikawa cells. Our results showed that HuR could be a causal factor of ER-α regulation in Ishikawa cells and thus may induce the hormone-dependent endometrial carcinoma.

Keywords

Endometrial carcinoma Ishikawa cell Human antigen R shRNA ER-α 

Abbreviations

ER

Estrogen receptor

HuR

Human antigen R

shRNA

Short hairpin RNA

shHuR

Short hairpin RNA against HuR

MTT

3-(4,5-Dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide

RT-PCR

Reverse-transcripted polymerase chain reaction

UTR

Untranslated region

Notes

Acknowledgments

This work is supported by the Natural Science Foundation of China (Grant Number: 30973189).

Conflict of interest

None.

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Copyright information

© International Society of Oncology and BioMarkers (ISOBM) 2014

Authors and Affiliations

  • Dandan Wang
    • 1
  • Min Wang
    • 1
  • Chang’e Hu
    • 1
  • Ting Shuang
    • 1
  • Yingying Zhou
    • 1
  • Xiaoyu Yan
    • 1
  1. 1.Department of Gynecology and ObstetricsShengjing Hospital of China Medical UniversityShenyangChina

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