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重组人血管内皮抑素对兔VX-2移植瘤腘窝淋巴转移干预的实验研究
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摘要
目的:
     (1)观察重组人血管内皮抑素对兔VX-2移植瘤血管及淋巴管生成的影响,探讨其在兔移植瘤生长及腘窝淋巴结转移中的作用。
     (2)通过对兔VX-2肌肉移植瘤腘窝淋巴结组织中的新生血管进行微血管密度(MVD)计数及淋巴结铸型,观察淋巴结组织中微血管的形态及分布特点。
     方法:
     从南华大学实验动物部提取12只新西兰大白兔并在其右后小腿外侧肌肉内植入兔VX-2瘤组织块(1mm~3)建立兔VX-2肌肉移植瘤模型,1周后移植瘤长至直径约3mm大小,并随机分成两组,实验组用恩度0.75mg/Kg耳缘静脉注射抑制兔VX-2肌肉移植瘤生长,对照组用生理盐水耳缘静脉注射进行对照,均持续2周,移植术后每周行1次彩超检查测量瘤体大小及瘤体血供变化,描绘肿瘤生长曲线,计算抑瘤率,用药完成1周后放血处死两组新西兰大白兔,取出两组移植瘤组织及腘窝淋巴结组织进行免疫组化实验,以CD31及LYVE-1分别标记两组瘤组织中微血管及微淋巴管并计数,以CD31标记两组淋巴结组织中微血管并计数,同时检测两组瘤组织中VEGF的表达情况。
     采用注射铸型剂ABS(红色)经淋巴结入门小动脉之供血动脉进行淋巴结血管铸型,同时应用淋巴管间接注射技术注射铸型剂ABS(蓝色)观察淋巴结充盈情况。铸型完成后将铸型标本进行腐蚀、修剪,冲洗、切片、干燥、导电等处理,最后扫描电镜下观察和摄相,激光共聚焦下三维重建。
     结果:
     (1)重组人血管内皮抑素对兔VX-2移植瘤腘窝淋巴结转移率有明显抑制作用(P<0.05);对兔VX-2移植瘤生长体积及瘤体血供也有明显的抑制作用(P<0.05),抑瘤率IR达到了26.22%-29.09%。
     (2)实验组兔VX-2移植瘤组织及腘窝淋巴结组织内MVD分别比对照组VX-2移植瘤组织及腘窝淋巴结组织内MVD低(P<0.05)。
     (3)实验组兔VX-2移植瘤组织中MLVD比对照组兔VX-2移植瘤组织中MLVD低(P<0.05)。
     (4)实验组兔VX-2移植瘤组织中VEGF阳性表达细胞百分数(20.59±3.59)低于对照组兔VX-2移植瘤组织中VEGF阳性表达细胞百分数(30.10±3.89),并有统计学意义(P<0.05)。
     (5)对照组VX-2移植瘤细胞VEGF阳性表达水平与兔VX-2移植瘤组织中MVD及MLVD呈正相关(r=0.89,P =0.000;r=0.79,P =0.001),与其腘窝淋巴结组织中MVD也呈正相关(r=0.87,P =0.001);实验组VX-2移植瘤细胞VEGF阳性表达水平与兔VX-2移植瘤组织中MVD及MLVD呈正相关(r=0.85,P =0.003;r=0.81,P =0.006),与其腘窝淋巴结组织中MVD也呈正相关(r=0.82,P =0.001)。
     结论:
     (1)重组人血管内皮抑素对兔VX-2移植瘤细胞VEGF表达、瘤组织MVD及MLVD水平有抑制作用。提示:重组人血管内皮抑素可抑制微血管和微淋巴管生成。
     (2)重组人血管内皮抑素能抑制兔VX-2移植瘤腘窝淋巴结转移,对淋巴结内MVD水平有抑制作用。
Purpose:
     (1) Observing rh-endostatin to inhibit Angiogenesis and Lymphangiogenesis of the implanted VX-2 tutor, and discussing the functions of the implanted VX-2 tutor building and the metastasis of popliteal lymph nodes.
     (2) Through counting the microvessel density (MVD) of the popliteal lymph nodes issue of implanted VX-2 tumor to rabbits and Lymph nodes matrix ,and observing the shape,distribution characteristics of the microvessel in the popliteal lymph nodes
     Methods:
     Selected 12 New Zealand white rabbits for the laboratory of the University of Nanhua, and implanted VX-2 rabbit tumor issues(1mm~3)in the muscles of their right hind legs to build the model of implanted VX-2 tutor, and the implanted tumors grown to 3mm in diameter after a week. We divided them randomly into two groups, for the experimental group, we kept using 0.75mg/Kg Endostar intravenous injections in ears vein for two weeks to inhibit the growth of VX-2 implanted tumors, and we used physiological saline intravenous injections for the matched group which also lasted for two weeks. And used color Doppler ultrasound once a week to measure the volume change of the tumors and the change of blood supply within the tumors , then we drew a curve to illustrate the growth of the tumors and calculate the inhibition rate(IR). After using Endostar for a week, we took out the tumor tissues and popliteal lymph nodes of the two group, with the help of immunohistochemistry technology, we marked microvessels and microlymphatic vessels in tumor tissues by CD31 and LYVE-1 respectively and recorded the MVD and MLVD for the two group, and marked microvessels in popliteal lymph node tissues by CD31 for the two group and recorded its MVD, and checked the VEGF in the tumor tissues of the two group.
     Adopt an injection with a dose of ABS(red) the lymph nodes introduction of the arterial blood for blood to the nodes with type,indirectly at the same time the lymph application of technology to inject injected with a dose of ABS(blue)observed all nodes. When completed shall form a unit of type, trim, the flushing, slice, dry and conduct electricity,etc. the scanning and camera is focused on laser of reconstruction. the three-dimensional
     Results:
     (1)Endostar has performed well in inhibiting the metastasis of the popliteal lymph nodes in VX-2 muscles implanted tumors for rabbit(sP<0.05);it has also a remarkable performance in inhibiting the tumor growth and the blood supply inside (all the Ps are below 0.05), and it has achieved IR from 26.22% to 29.09%.
     (2)The MVDs in VX-2 rabbit tumor tissues and popliteal lymph node tissues of the matched group are higher than those of the experimental group (P<0.05).
     (3)In the matched group, the MLVDs of VX-2 rabbit tumor tissues are higher than those of the experimental group(P<0.05).
     (4)The VEGF positive rates of cell percentage in the VX-2 rabbit tumor issues of the matched group(30.10±3.89)are higher than those rates of the experimental group(20.59±3.59), which has a statistical significance(P<0.05).
     (5)The VEGF rate of the VX-2 rabbit tumor cell in the matched group correlates positively with the MVDs in the VX-2 rabbit tumor issues and popliteal lymph node tissue(sr=0.89,P =0.000;r=0.79,P =0.001), as well as the MLVDs of the VX-2 tumor tissues,(r=0.87,P =0.001). The VEGF rate of the VX-2 rabbit tumor cell in the experimental group correlates positively with the MVDs in the VX-2 rabbit tumor issues and popliteal lymph node tissues(r=0.85,P =0.003;r=0.81,P =0.006), as well as the MLVDs of the VX-2 tumor tissues,(r=0.82,P =0.001).
     Conclusion:
     (1) Endostar can inhibit the VEGF positive high rate of VX-2 rabbit implanted tumors, And influence the rate of MVD and MLVD of VX-2 rabbit implanted tumors.
     (2) Endostar can inhibit the metastasis of its popliteal lymph node,and influence the rate of MVD of the metastatic lymph node.
引文
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