Medical Oncology

, Volume 29, Issue 5, pp 3484–3490

Oncogenic role of SOX9 expression in human malignant glioma

Original Paper

DOI: 10.1007/s12032-012-0267-z

Cite this article as:
Wang, L., He, S., Yuan, J. et al. Med Oncol (2012) 29: 3484. doi:10.1007/s12032-012-0267-z

Abstract

SOX9 belongs to the SOX (Sry-related high-mobility group box) family and acts as a transcription factor that plays a central role in the development and differentiation of multiple cell lineages. Recent studies have demonstrated that SOX9 is required for the carcinogenesis in several cancer types. The aim of this study was to investigate the clinicopathological significance of SOX9 expression in human malignant glioma. SOX9 mRNA expression was detected by real-time quantitative RT-PCR assay in glioma and nonneoplastic brain tissues. Then, the association of SOX9 mRNA expression with clinicopathological factors or prognosis of glioma patients was statistically analyzed. In addition, the small interfering RNA was used to knockdown SOX9 expression in a glioma cell line and to analyze the effects of SOX9 inhibition on cell growth, cell cycle and apoptosis of glioma cell line. The expression level of SOX9 mRNA in glioma tissues was significantly higher than that in corresponding nonneoplastic brain tissues (P < 0.001). In addition, a high level of SOX9 mRNA expression was significantly more common in glioma tissues with advanced WHO grade than those with low grade (P = 0.02). The increased expression of SOX9 mRNA was also significantly correlated with low Karnofsky performance score (P = 0.008). Meanwhile, the disease-free and overall survival rates of patients with high SOX9 mRNA expression were obviously lower than those of patients with low SOX9 mRNA expression (both P = 0.01). Multivariate analysis showed that high SOX9 mRNA expression was an independent prognostic factor for glioma patients (P = 0.02). Moreover, the down-regulation of SOX9 could inhibit the cell growth, induce the cell arrest in G2/M phase of cell cycle and enhance the apoptosis in glioma cells. Our data suggest for the first time that the over-expression of SOX9 mRNA is closely associated with poor clinical outcome of patients with malignant gliomas, and targeting SOX9 may be a novel therapeutic strategy for this tumor.

Keywords

SOX9GliomaRT-PCRWestern blotRNA interferencePrognosis

Copyright information

© Springer Science+Business Media, LLC 2012

Authors and Affiliations

  • Liang Wang
    • 1
  • Shiming He
    • 1
  • Jun Yuan
    • 2
  • Xinggang Mao
    • 3
  • Yizhan Cao
    • 4
  • Jianhai Zong
    • 1
  • Yanyang Tu
    • 4
  • Yongsheng Zhang
    • 2
  1. 1.Department of NeurosurgeryTangdu Hospital, Fourth Military Medical UniversityXi’an CityPeople’s Republic of China
  2. 2.Administrative DepartmentTangdu Hospital, Fourth Military Medical UniversityXi’an CityPeople’s Republic of China
  3. 3.Department of Neurosurgery254th Hospital of PLATianjin CityPeople’s Republic of China
  4. 4.Department of Experimental SurgeryTangdu Hospital, Fourth Military Medical UniversityXi’an CityPeople’s Republic of China