J Korean Neurosurg Soc.  2005 Jan;37(1):48-53.

The Combined Effect of Gamma Knife Irradiation and p53 Gene Transfection in Human Malignant Glioma Cell Lines

• Kim JE
• Paek SH
• Kim DG
• Chung HT
• Kim YY
• Jung HW

Abstract

OBJECTIVE
The purpose of this study is to elucidate in vitro responses to combined gamma knife irradiation and p53 gene transfection on human malignant glioma cell lines. METHODS: Two malignant human glioma cell lines, U87MG (p53-wild type) and U373MG (p53-mutant) were transfected with an adenoviral vector containing p53 (MOI of 50) before and after applying 20Gy of gamma irradiation. Various assessments were performed, including, cell viability by MTT assay; apoptosis by annexin assay; and cell cycle by flow cytometry, for the seven groups: mock, p53 only, gamma knife (GK) only, GK after LacZ, LacZ after GK, GK after p53, p53 after GK. RESULTS: Cell survival decreased especially, in the subgroup transfected with p53 after gamma irradiation. Apoptosis tended to increase in p53 transfected U373 MG after gamma irradiation (apoptotic rate, 38.9%). The G2-M phase cell cycle arrest markedly increased by transfecting with p53, 48 hours after gamma knife irradiation in U373 MG (G2-M phase, 90.8%). CONCLUSION: These results suggest that the in vitro effects of combined gamma knife irradiation and p53 gene transfection is an augmentation of apoptosis and G2-M phase cell cycle arrest, which are more exaggerated in U373 MG with p53 transfection after gamma knife irradiation.

Keyword

Adenovirus; Gamma knife; Gene therapy; Malignant glioma; p53; Radiation

MeSH Terms

Adenoviridae
Apoptosis
Cell Cycle
Cell Cycle Checkpoints
Cell Line*
Cell Survival
Flow Cytometry
Genes, p53*
Genetic Therapy
Glioma*
Humans*
Transfection*