Asian Pacific Journal of Cancer Prevention

Asian Pacific Journal of Cancer Prevention (아시아태평양암예방학회)
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Differential Protein Expression in EC304 Gastric Cancer Cells Induced by Alphastatin

  • Wang, Xin-Xin (Department of General Surgery, Chinese People's Liberation Army General Hospital) ;
  • Sun, Rong-Ju (Department of Emergency, Chinese People's Liberation Army General Hospital) ;
  • Wu, Meng (Department of Plastic Surgery, Chinese People's Liberation Army General Hospital) ;
  • Li, Tao (Department of General Surgery, Chinese People's Liberation Army General Hospital) ;
  • Zhang, Yong (Department of General Surgery, Chinese People's Liberation Army General Hospital) ;
  • Chen, Lin (Department of General Surgery, Chinese People's Liberation Army General Hospital)
  • Published : 2012.04.30
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Abstract

Objective: To explore the differential protein expression profile in EC304 gastric cancer cells induced by alphastatin. Methods: Cultured EC304 cells in the exponential phase of growth were randomly divided into alphastatin and control groups. Total proteins were extracted and the two dimensional electrophoresis (2-DE) technique was applied to analyze differences in expression with ImageMaster 2D Platinum 5.0 software. Proteins were identified using the MASCOT database and selected differently expressed proteins were characterised by western blotting and immunofluorescence. Results: $1350{\pm}90$ protein spots were detected by the ImageMaster software in the 2-DE gel images from the control and alphastatin groups. The match rate was about 72-80% for the spectrum profiles, with 29 significantly different protein spots being identified, 10 upregulated, 16 downregulated, two new and one lost. The MASCOT search scores were 64-666 and the peptide matching numbers were 3-27 with sequence coverage of 8-62%. Twenty-three proteins were checked by mass spectrometry, including decrease in Nm23 and profilin-2 isoform b associated with the regulation of actin multimerisation induced by extracellular signals. Conclusion: The proteome in EC304 cells is dramatically altered by alphastatin, which appears to play an important role in modulating cellular activity and anti-angiogenesis by regulating protein expression and signal transduction pathways through Nm23 and profilin-2 isoform b, providing new research directions for anti-angiogenic therapy of gastric cancer.

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References

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