GRP78 upregulation-induced increase in cisplatin sensitivity of SPCA1 lung cancer cells

Li Chuan Zhang, Jia Rui Wang, Long Zhao, Tao Wang, Jing Wu, Su Fang Fan, Li Xia Chen, Shu Juan Shao, Joseph Molnár, Qi Wang

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Background Glucose regulated protein 78 (GRP78), an endoplasmic reticulum (ER) chaperone, plays a critical role in chemotherapy resistance in a variety of cancers. In this study, we investigated the up-regulation of GRP78 induced by A23187 and its association with the chemotherapeutical sensibility to cisplatin in human lung cancer cell line SPCA1. Methods SPCA1 cells were pretreated with A23187 at different concentrations. The expression of GRP78 at the mRNA level was analyzed by RT-PCR; the expression of GRP78 at the protein level was determined by Western blotting and immunofluorescence assay. Cell survival was determined by MTT assay. Cell apoptosis was analyzed by flow cytometry. Results The expression of GRP78 at both the mRNA and protein levels was obviously induced by A23187 in SPCA1 cells, with an elevation of GRP78 by 2.1-fold at the mRNA level and by 3.8-fold at the protein level compared to the control. There was a dose-dependent response. Survival curve analysis demonstrated that A23187 induction caused a significant reduction of survival for the cells subjected to cisplatin treatment (P <0.05). After treatment by cisplatin, the percentage of apoptotic cells in the A23187 pretreated group increased about three fold compared with the control group ((27.53±4.32)% vs. (9.25±3.64)%, P <0.05). Conclusions A23187 treatment was fairly effective for the induction of GRP78 in SPCA1 cells at both the mRNA and protein levels. To a certain extent, GRP78 up-regulation by A23187 was associated with the enhancement of drug sensitivity to cisplatin in human lung cancer cell line SPCA1.

Original languageEnglish
Pages (from-to)3341-3346
Number of pages6
JournalChinese Medical Journal
Volume124
Issue number20
DOIs
Publication statusPublished - Nov 1 2011

Keywords

  • Chemosensitivity
  • Cisplatin
  • GRP78
  • Human lung cancer cell line SPCA1

ASJC Scopus subject areas

  • Medicine(all)

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  • Cite this

    Zhang, L. C., Wang, J. R., Zhao, L., Wang, T., Wu, J., Fan, S. F., Chen, L. X., Shao, S. J., Molnár, J., & Wang, Q. (2011). GRP78 upregulation-induced increase in cisplatin sensitivity of SPCA1 lung cancer cells. Chinese Medical Journal, 124(20), 3341-3346. https://doi.org/10.3760/cma.j.issn.0366-6999.2011.20.024