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S100A4 Expression is Closely Linked to Genesis and Progression of Glioma by Regulating Proliferation, Apoptosis, Migration and Invasion

  • Jin, Ting (Department of Neurosurgery, The First Affiliated Hospital of Liaoning Medical University) ;
  • Zhang, Zhuo (Department of Stomatology, The First Affiliated Hospital of Liaoning Medical University) ;
  • Yang, Xue-Feng (The Key Laboratory of Brain and Spinal Injury of Liaoning Province, The First Affiliated Hospital of Liaoning Medical University) ;
  • Luo, Jun-Sheng (The Key Laboratory of Brain and Spinal Injury of Liaoning Province, The First Affiliated Hospital of Liaoning Medical University)
  • Published : 2015.04.14

Abstract

Background: The calcium-binding S100A4 protein is involved in epithelial to mesenchymal transition, oncogenic transformation, angiogenesis, cytoskeletal integrity, mobility and metastasis of cancer cells. This study aimed to clarify the roles of S100A4 in genesis and progression of glioma. Materials and Methods: S100A4 expression was examined by real-time RT-CPR and Western blot in glioma and paired normal brain tissue (n=69), and compared with clinicopathological parameters of tumors. In addition, glioma U251 cells transfected with an S100A4-expressing plasmid were examined for proliferation by MTT, apoptosis by Annexin V-FITC, and migration and invasion with Transwell chambers. Results: Increased S100A4 mRNA expression was found in gliomas, compared with paired non-tumor tissue (p<0.001). Gradual elevation of overexpression of S100A4 was observed with increasing glioma grade (p<0.001). Astrocytoma showed lower S100A4 mRNA expression than oligodendrogliomas, with glioblastomas having highest values (p<0.001). Similar results were obtained for S100A4 protein, a positive link being found between mRNA and protein expression in gliomas (p<0.001). There was higher growth, lower apoptosis, stronger migration and invasion of S100A4 transfectants than control and mock transfected cells (p<0.001). Conclusions: These findings indicate that up-regulated S100A4 expression is positively linked to pathogenesis, progression and histogenesis of glioma by modulating proliferation, apoptosis, migration and invasion.

Keywords

Glioma;S100A4;pathogenesis;progression;aggressiveness

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