바로가기  >

[Abstract]

Purpose: We investigated the effect of chemoradiotherapy with PP2 and temozolomide (TMZ) on malignant glioma cells using clonogenic assays and in vivo brain tumor model.

Materials and Methods: The effect of PP2 on radiosensitivity of U251 and T98G cells was investigated using clonogenic assays. The expression of E-cadherin, MMP2, EphA2, and VEGF was measured by Western blotting and an accumulation of γH2AX foci 6 h after radiotherapy was measured after PP2 treatment. The effect of PP2 on migration, invasion, and vasculogenic mimicry formation (VMF) of U251 cells was evaluated. In an orthotopical brain tumor model with U251 cells, PP2 was injected intraperitoneally with or without oral TMZ before, during and after whole brain radiotherapy. Bioluminescence images were taken to visualize in vivo tumors and immunohistochemical staining of VEGF, CD31, EphA2, and HIF1a was performed.

Results: PP2 increased radiosensitivity of U251 and T98G cells without decreasing survival of normal human astrocytes. Chemoradiotherapy with PP2 and TMZ resulted in increased accumulation of γH2AX foci. PP2 induced overexpression of E-cadherin and suppression of MMP2, VEGF, and EphA2. PP2 also compromised invasion, migration, and VMF of U251 cells. In brain tumors, chemoradiotherapy with PP2 and TMZ decreased tumor volume best, but not statistically significantly compared with chemoradiotherapy with TMZ. The expression of VEGF and CD31 was suppressed in PP2-treated tumors.

Conclusion: s PP2 enhances radiosensitivity of malignant glioma cells and suppresses invasion and migration of U251 cells. Chemoradiotherapy with PP2 and TMZ resulted in non-significant tumor volume decrease.

[Author information]

Eom KY1, Cho BJ1, Choi EJ1, Kim JH2, Chie EK2, Wu HG2, Kim IH2, Paek SH3, Kim JS1, Kim IA1.

1Department of Radiation Oncology, Seoul National University, Graduate School of Medicine, Seoul, Korea.

2Department of Radiation Oncology, Seoul National University College of Medicine, Seoul, Korea.

3Department of Neurosurgery, Seoul National University College of Medicine, Seoul, Korea.