Journal of Korean Neurosurgical Society

The Korean Neurosurgical Society (대한신경외과학회)
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Inhibitory Effects of Toxoplasma Antigen on Proliferation and Invasion of Human Glioma Cells

  • Choo, Juk-Dong (Department of Neurosurgery, Sun General Hospital) ;
  • Lee, Jong-Soo (Department of Neurosurgery, Sun General Hospital) ;
  • Kang, Jong-Sul (Department of Neurosurgery, Sun General Hospital) ;
  • Lee, Hyun-Sung (Department of Neurosurgery, Sun General Hospital) ;
  • Yeom, Jin-Young (Departments of Neurosurgery, College of Medicine, Chungnam National University) ;
  • Lee, Young-Ha (Departments of Parasitology, College of Medicine, Chungnam National University)
  • Published : 2005.02.28
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Abstract

Objective: Currently available therapies for human malignant gliomas have limited efficacy. Toxoplasma gondii, an obligate intracellular protozoan parasite, and Quil-A are nonspecific, potent immune stimulants. T. gondii is shown to have antitumor activity in some types of cancers. Therefore, this study is undertaken to evaluate the antitumor effect of Toxoplasma lysate antigen (TLA), alone or in combination with Quil-A, on human glioma U373MG and U87MG cells. Methods: The in vitro effects of TLA alone or in combination with Quil-A on the proliferation, invasion, and apoptosis of glioma cells were tested using MTT, Matrigel invasion, and DNA fragmentation assays, and the in vivo effects on the growth of gliomas were evaluated in athymic nude mice transplanted with glioma cells. Results: Treatment with TLA resulted in the suppressed proliferation and invasion of both U373MG and U87MG cells, in a dose-dependent manner. In addition, at high concentration, TLA induced glioma cell apoptosis. When TLA was administered in the mouse glioma model, malignant glioma growth was decreased. The combined treatment of TLA with Quil-A significantly inhibited the proliferation and invasion of cultured cells as well as tumor mass of implanted mice. Conclusion: TLA inhibits the proliferation and invasion of glioma cells in vitro and in vivo, and these antitumor effects of TLA are significantly enhanced by the addition of Quil-A.

Keywords

References

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