靶向超声造影评价裸鼠肾癌新生血管的实验研究

目的 探讨以血管内皮生长因子受体2 (VEGFR2)为靶点的靶向超声造影评价裸鼠肾癌新生血管的应用价值.方法 建立人肾透明细胞癌皮下移植瘤裸鼠模型,制备携VEGFR2抗体的靶向造影剂(MBV),每只裸鼠分别随机注射普通造影剂(MBC)和MBV并行超声造影检查,比较两种造影剂的视频强度,并对肿瘤组织行VEGFR2免疫组化检测.结果 超声造影示MBV组视频强度(6.50±1.43)Db,MBC组视频强度(2.59±0.99)Db,两者差异有统计学意义(P<0.01),且MBV组持续强化时间较MBC组长,免疫组化结果证实肿瘤血管内皮VEGFR2高表达.结论 以VEGFR2为靶点的靶向造影剂可特异性增强肾癌显影,对评估肿瘤新生血管有重要价值.

Abstract：

Objective To investigate the value of contrast enhanced ultrasound(CEUS) with microbubbles targeted to vascular endothelial growth factor receptor type 2 (VEGFR2) for imaging tumor angiogenesis in murine tumor models.Methods Established human renal cell carcinomas(RCC) subcutaneous xenograft tumor model in nude mice,microbubbles targeted to VEGFR2(MBV) was prepared,control microbubbles(MBC) and MBV were injected respectively in each mouse,the intensity of each microbubble was compared,the expressions of VEGFR2 in tumors were tested by immunohistochemistry.Results CEUS imaging showed the intensity of MBV and MBC was (6.50±1.43)dB,(2.59±0.99)dB,respectively.There was significantly higher intensity when using MBV compared with MBC (P<0.01).The time to wash out was longer in MBV contrast group compared with MBC group.Immunohistochemistry showed VEGFR2 was highly expressed in novel vessel walls.Conclusions Contrast microbubbles targeted to VEGFR2 can specially enhance the images of RCC and has tremendous significance in the assessment of angiogenesis.

Targeted contrast-enhanced ultrasound in the assessment of renal cell carcinoma angiogenesis in nude mice

Objective To investigate the value of contrast enhanced ultrasound(CEUS) with microbubbles targeted to vascular endothelial growth factor receptor type 2 (VEGFR2) for imaging tumor angiogenesis in murine tumor models.Methods Established human renal cell carcinomas(RCC) subcutaneous xenograft tumor model in nude mice,microbubbles targeted to VEGFR2(MBV) was prepared,control microbubbles(MBC) and MBV were injected respectively in each mouse,the intensity of each microbubble was compared,the expressions of VEGFR2 in tumors were tested by immunohistochemistry.Results CEUS imaging showed the intensity of MBV and MBC was (6.50±1.43)dB,(2.59±0.99)dB,respectively.There was significantly higher intensity when using MBV compared with MBC (P<0.01).The time to wash out was longer in MBV contrast group compared with MBC group.Immunohistochemistry showed VEGFR2 was highly expressed in novel vessel walls.Conclusions Contrast microbubbles targeted to VEGFR2 can specially enhance the images of RCC and has tremendous significance in the assessment of angiogenesis.