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同位素  2012 

99Tcm标记NGR及其在荷人HePG2肝癌裸鼠体内的生物分布及SPECT显像

, PP. 27-32

Keywords: 99Tcm,NGR,肿瘤,SPECT显像

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Abstract:

用99Tcm标记了含有天冬酰胺-甘氨酸-精氨酸(Asn-Gly-Arg)序列的血管靶向性短肽NGR,评价了标记物99Tcm-NGR的放化性质以及在荷HePG2肝癌模型裸鼠体内的生物分布和SPECT显像。标记结果显示,99Tcm-NGR的标记率>90%,放化纯度>95%。荷瘤裸鼠体内生物分布结果显示,99Tcm-NGR在肾脏和肝脏的摄取率较高,注射后1h肿瘤摄取达(2.52±0.62)%ID/g,最高达(7.26±2.71)%ID/g,12h仍然达(3.93±1.93)%ID/g,但在竞争性抑制组中摄取率为(1.29±0.85)%ID/g。荷瘤裸鼠的SPECT显像结果显示,除肿瘤外,其他组织器官的放射性摄取随时间延长逐渐降低,肿瘤与肌肉组织的放射性攝取比(T/NT)4h时最高,可达3.25。注射后1h肿瘤可见,12h时最为清晰。以上结果提示,99Tcm-NGR易于制备,具有良好的靶向性,在肿瘤的诊疗中具有良好的研究前景。

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