Tumor Enhancement Effect of Overexpressed Manganese-superoxide Dismutase in Manganese-enhanced MR Imaging
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概要
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Purpose: Manganese-enhanced magnetic resonance imaging (MEMRI), used to trace neuronal connections and visualize brain activity, has recently been suggested useful for tumor detection, but the mechanism of tumor enhancement by manganese (Mn) is poorly understood. Our recent report of preferential enhancement of human mesothelioma cells with higher levels of manganese-superoxide dismutase (Mn-SOD) expression may suggest a correlation between Mn-SOD expression and enhancement. We investigate this possibility further using engineered human ovarian cancer cells overexpressing Mn-SOD. Methods: We subcutaneously implanted SK-OV-3 human ovarian cancer cells stably overexpressing Mn-SOD (SK-Mn-SOD) into athymic nude mice and SK-OV-3 cells with plasmid DNAs carrying neomycin-resistant genes (SK-neo) into the same mice for controls. We conducted MEMRI in the tumor-bearing mice and compared enhancement between the 2 tumors. Results: Subcutaneous SK-Mn-SOD tumors were preferentially enhanced in MEMRI compared to SK-neo tumors. After Mn enhancement, the T1-relaxation rate (R1=1/T1) increased significantly for SK-Mn-SOD but not SK-neo tumors. Conclusion: In some tumors, high expression of Mn-SOD may be a biological factor responsible for enhanced signal in MEMRI.
- 2011-09-01
著者
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Aoki Ichio
Molecular Imaging Center National Institute Of Radiological Sciences
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Saga Tsuneo
Molecular Imaging Center National Institute Of Radiological Sciences
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HASEGAWA Sumitaka
Molecular Imaging Center, National Institute of Radiological Sciences
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Furukawa Takako
Molecular Imaging Center National Institute Of Radiological Sciences
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Hasegawa Sumitaka
Molecular Imaging Center National Institute Of Radiological Sciences
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SAITO Shigeyoshi
Molecular Imaging Center, National Institute of Radiological Sciences
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KOSHIKAWA YANO
Molecular Imaging Center, National Institute of Radiological Sciences
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Koshikawa Yano
Molecular Imaging Center National Institute Of Radiological Sciences
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Saito Shigeyoshi
Molecular Imaging Center National Institute Of Radiological Sciences
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