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同位素  2015 

18F-FDG、18F-RGD和18F-FET在LN229脑胶质模型体内生物分布和Micro-PET显像

DOI: 10.7538/tws.2015.28.03.0155, PP. 155-159

Keywords: 脑胶质瘤,Micro-PET显像,O-(2-18F-氟代乙基)-L-酪氨酸

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Abstract:

为研究肿瘤显像剂18F-FDG、18F-RGD和18F-FET在LN229脑胶质瘤模型裸鼠体内分布和Micro-PET肿瘤显像,采用酪氨酸和NOTA修饰的[c(RGDyK)]2为前体分别合成18F-FET和18F-RGD;颅内注射LN229细胞建立脑胶质瘤模型,研究18F-FDG、18F-RGD和18F-FET在注射30min和60min体内脏器分布以及荷瘤鼠Micro-PET显像。结果表明,18F-FET和18F-RGD放化纯度大于95%。荷瘤鼠体内分布显示,注射后1h,18F-FDG、18F-RGD和18F-FET在脑胶质瘤和脑组织内(括号内)的摄取分别为(4.89±0.65)%ID/g((2.72±0.76)%ID/g)、(2.10±0.32)%ID/g((0.23±0.01)%ID/g)、(3.02±0.64)%ID/g((0.74±0.12)%ID/g),18F-FDG、18F-RGD和18F-FET在肿瘤和脑摄取放射性比值分别为0.64±0.07(1.80±0.32)、8.22±1.03(9.13±1.21)和2.15±0.48(4.08±0.92),Micro-PET肿瘤显像清晰。结果提示,18F-FET和18F-RGD更适用于脑胶质瘤的诊断。

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