摘要
突触结合蛋白I-C2A片段(SytI-C2A)具有与活化血小板膜表面的磷脂酰丝氨酸(PS)特异结合的能力。本研究通过动物实验初步探讨99Tcm标记突触结合蛋白I-C2A片段(99Tcm-SytI-C2A)作为显像剂用于进行急性静脉血栓显像的可行性。选择比格犬5只,通过导管将双股螺旋金属丝送入一侧后肢股静脉,制成急性股静脉血栓模型;然后静脉注射99Tcm-SytI-C2A185MBq,注射后1h、2h和3h分别进行显像,用勾画"感兴趣"区的方法计算血栓部位与对侧后肢的对称部位以及血栓/本底的放射性比值。取出血栓、后肢肌肉和血液等标本,体外测定%ID·g-1值。结果表明,注射后1h、2h和3h,血栓部位与对侧后肢对称部位的放射性比值分别为3.01±0.30、3.22±0.21和3.37±0.57;与同侧下肢放射性本底的比值分别为3.10±0.39、3.32±0.31和3.50±0.45。体外检测结果显示出股静脉血栓的单位质量放射性摄取量是血液的2.40±0.35倍,是后肢肌肉的68.90±45.30倍。99Tcm-SytI-C2A能用于无创性地早期检测静脉血栓,有望成为较理想的新型血栓显像剂。
^99Tc^m labeled C2A domain of synaptotagmin I （^99Tc^m-Syt I-C2A） is a scintigraphic tracer that binds to phosphatidylserine exposed on activated platelets. This study is to determine the potential of this agent for imaging acute venous thrombosis. A stainless steel was placed in femoral vein for inducing venous thrombi in 5 dogs, which were injected each with 185 MBq of ^99Tc^m-Syt I-C2A. Images of legs were acquired at 1, 2 and 3 h after injection. ROI analysis was applied to measure the thrombus-to-contralateral location and thrombus-to-background ratios. The samples of thrombus, blood, and muscle were separated and were counted in a ） well counter for percent injected dose %ID.g1. Thrombus-to-blood and thrombus-to-muscle ratios were calculated from the %ID.g1 value. In in vivo imaging, the thrombus-to- contralateral location ratios were 3.01±0.30, 3.22±0.21 and 3.37±0.57, respectively, and thrombus-to-background ratios were 3.10±0.39, 3.32±0.31 and 3.50±0.45, respectively, at 1, 2 and 3 h after injection. The thrombus-to-blood and thrombus-to-muscle ratios of %ID.g1 were 2.40±0.35 and 68.90±45.30, respectively. ^99Tc^m-Syt I- C2A with high venous thrombus uptake is a promising agent for imaging acute venous thrombosis.
出处
《核技术》
EI
CAS
CSCD
北大核心
2008年第2期133-136,共4页
Nuclear Techniques
基金
国家自然科学基金(30500134)资助
关键词
血栓形成
核素显像
突触结合蛋白
血小板
Thrombosis, Radionuclide imaging, Synaptotagmin I, Platelets
