外源性血管内皮生长因子对损伤脊髓的作用

目的 研究外源性血管内皮生长因子(VEGF)局部应用对大鼠损伤脊髓神经组织的作用.方法采用改良Allen氏重量打击法大鼠急性脊髓损伤模型.脊髓打击性损伤后,将模型大鼠随机分组,并依组别在蛛网膜下腔分别给药.A组:生理盐水10μL,B组:Matrigel蛋白胶10 μL,C组:重组人VEGF165 0.2 μg+Matr...     

脊髓损伤后毛细血管新生与血管内皮生长因子mRNA的表达

目的探讨脊髓损伤后毛细血管新生与血管内皮生长因子（VEGF）mRNA的表达。方法采用改良Allen＇s重量打击法大鼠急性脊髓损伤模型,用马松三色染色法观察脊髓损伤后毛细血管的新生情况,原位杂交法观察急性损伤后大鼠脊髓VEGF mRNA表达的动态变化。结果脊髓损伤后引起脊髓组织中血管密度和血管分布改变,脊髓急性损伤后损伤局部出现短暂的血管新生过程。同时,原位杂交结果显示VEGFmRNA的表达上调,表达时间与血管变化的时间重叠。除了时间上的相互关联外,脊髓损伤后毛细血管新生与VEGF mRNA的表达在空间分布上是一致的。结论脊髓急性损伤可上调VEGFmRNA在脊髓血管内皮细胞、胶质细胞和巨噬细胞内的表达,有短暂的血管新生过程,损伤组织中VEGFmRNA的表达与其毛细血管新生的调节密切相关。     

急性损伤对大鼠脊髓血管内皮生长因子表达的影响

目的了解血管内皮生长因子(VEGF)在急性损伤后的大鼠脊髓中表达的动态变化。方法采用改良Allen重量打击法大鼠急性脊髓损伤模型，用免疫组织化学方法观察了急性损伤后大鼠脊髓VEGF表达的动态变化。结果急性损伤12hVEGF即可在大鼠脊髓软脊膜、脊髓内的血管内皮细胞、胶质细胞和巨噬细胞内表达，1d达高峰，并持续到3d，7d时开始下降。结论急性损伤可上调VEGF在脊髓血管内皮细胞、胶质细胞和巨噬细胞内的表达，VEGF可能通过促进血管内皮细胞生长对损伤神经元起一定的保护作用。     

血管内皮生长因子在胃癌中的表达及其意义

血管内皮生长因子在胃癌中的表达及其意义陶厚权秦兰芳林言箴尹浩然研究表明［１］，由肿瘤细胞分泌和激活的某些内皮生长因子如碱性成纤维细胞生长因子（ｂＦＧＦ）、转化生长因子－β（ＴＧＦ－β）、血管内皮生长因子（ＶＥＧＦ）等在肿瘤新生血管形成中有重要作用。其...     

血管内皮生长因子对脊髓损伤细胞凋亡的影响

目的：探讨血管内皮生长因子（VEGF）对脊髓损伤细胞凋亡的影响及保护机制.方法：采用Allen的Weight dropping法挫伤大鼠T10节段脊髓,于术后2、4、8 h,1、3、7 d经蛛网膜下隙导管各注入VEGF溶液（5μl/100 g）,并与生理盐水组和正常组作对照.采用原位末端标记法标记脱氧核糖核酸片段,检测脊髓损伤前后发生凋亡的脊髓细胞.结果：正常对照组大鼠脊髓中未见凋亡细胞.生理盐水组于伤后4 h始出现凋亡细胞.VEGF组与生理盐水组相比较,凋亡细胞明显减少（P＜0.01）.结论：VEGF可抑制脊髓损伤后细胞的凋亡,从而保护损伤的脊髓组织.     

急性损伤对大鼠脊髓血管内皮生长因子受体表达的影响

目的 探讨急性损伤对大鼠脊髓血管内皮生长因子(VEGF)两个受体(Flt-1、Flk-1)表达的影响.方法 采用改良Allen's重量打击法大鼠急性脊髓损伤模型,用免疫组织化学方法观察急性损伤后大鼠脊髓VEGF受体Flt-1、Flk-1表达的动态变化.结果 Flt-1、Flk-1在大鼠脊髓损伤后12 h表达上调,24 ...     

血管内皮生长因子在乳腺癌中的表达及其临床意义

目的 研究血管内皮生长因子（ＶＥＧＦ）在乳腺癌的发生及判断预后方面的意义。方法 应用Ｓ－Ｐ免疫组化染色法检测ＶＥＧＦ在乳腺良恶性病变中的表达。结果 乳腺癌ＶＥＧＦ表达阳性率（７２．５％）高于乳腺良性病变（２／８）,二者间差异具有显著性（Ｐ〈０．０５）。４０例乳腺癌中,淋巴结转移组ＶＥＧＦ阳性表达（１９／２１）高于淋巴结转移组（１２／１９）,二者差异具有显著性（Ｐ〈０．０５）。结论 ＶＥＧＦ在乳腺癌     

血管内皮生长因子mRNA在激光视网膜损伤后的表达

缺血性视网膜病变是由于视网膜循环障碍而造成视网膜缺血、缺氧并诱发脉络膜新生血管形成。脉络膜新生血管膜的渗出和出血造成的视网膜中心凹功能的毁损 ,是当今内眼疾病视力丧失的主要原因。近年来研究表明 :新生血管的形成由各种生长因子和细胞因子刺激[1] ,其中血管内皮细胞生长因子在诱导眼底新生血管化中起着突出的作用[2 ] 。激光也可作为刺激因素诱发新生血管生成[3～ 5] 。本实验旨在用激光诱导眼底新生血生成的模型 ,通过原位杂交的方法观察VEGFmRNA表达的变化 ,结合新生血管生成的时相和部位 ,探讨VEGF与脉络膜新生血管发生…     

血管内皮生长因子在多发性骨髓瘤骨髓组织中的表达及其意义

目的：检测多发性骨髓瘤(MM)骨髓活检塑料包埋切片中血管内皮生长因子(VEGF)的表达情况，探讨VEGF在MM发病机制中的作用。方法：对20例初诊的MM患者和10例正常对照者进行骨髓活检，制成塑料包埋切片，应用免疫组织化学SP染色法检测骨髓组织中VEGF表达情况和微血管密度(MVD)，进行分析研究。结果：20例初诊MM患者骨髓中MVD及VEGF表达阳性率高于对照组，VEGF和MVD呈正相关。结论：VEGF和MM的血管生成密切相关；VEGF在MM发病机制中起着重要作用；抑制VEGF的分泌将有可能成为一种新的治疗MM的有效方法。     

Neuroprotective effect of exogenous vascular endothelial growth factor on rat spinal cord neurons in vitro hypoxia

Background Vascular endothelial growth factor （VEGF） is well known as a hypoxia-induced protein. That it markedly increased expression of VEGF and improvement of rat motor function after spinal cord injury suggested that VEGF could play a neuroprotective role in ischaemic tolerance. This study investigated whether vascular endothelial growth factor has direct neuroprotective effects on rat spinal cord neurons. Methods We employed primary cultures of embryonic rat spinal cord neurons, then administrated different concentrations of VEGF164 in the culture medium before hypoxia when the number of neurons was counted and the cell viability was detected by MTT. The neuronal apoptosis and expression of VEGF and its receptor genes were evaluated by terminal deoxynucleotidyl transferase mediated dUTP nick-end labelling （TUNEL） and immunohistochemistry. The VEGFR2/FLK-1 inhibitor, SU1498, was used to confirm whether the neuroprotective effect of VEGF was mediated through VEGFR2/Flk-1 receptors. Result In hypoxic conditions,the number and viability of neurons decreased progressively, while the number of TUNEL-positive cells increased along with the prolongation of hypoxic exposure. When the concentration of VEGF in cell culture medium reached 25 ng/ml, the cell viability increased 11% and neuronal apoptosis reduced to half, this effect was dose dependent and led to an approximately 25% increase in cell viability and about threefold decrease in TUNEL-positive cells at a maximally effective concentration of 100 ng/ml. In normal conditions, VEGF/Flk-1 but not VEGF/Flt-1 gene expressed at a low level： after hypoxia, the expression of VEGF/Flk-1, but not VEGF/Flt-1 was significantly increased. The protective effect of VEGF was blocked by the VEGFR2/Flk-1 receptor tyrosine kinase inhibitor, SU1498. Conclusions VEGF has direct neuroprotective effects on rat spinal cord neurons, which may be mediated in vitro through VEGFR2/Flk-1 receptors.     

骨髓基质细胞移植对大鼠脊髓损伤后环氧化酶-2和血管内皮生长因子表达的影响

目的：观察骨髓基质细胞（bone marrow stromal cells,BMSCs）移植对大鼠脊髓损伤后环氧化酶-2（cyclooxygenase-2, COX-2）和血管内皮生长因子（vascular endothelial growth factor,VEGF）蛋白表达的影响。方法大鼠随机分为3组：A为假手术组,B为细胞培养基（DMEM）对照组,C为BMSCs移植组。B组和C组大鼠进行脊髓压迫损伤模型制作。脊髓损伤后, B组和C组大鼠分别给予DMEM培养液或BMSCs脊髓损伤周围区注射。术后应用Western Blot方法检测COX-2、VEGF蛋白在损伤脊髓组织中的表达变化。结果 COX-2、VEGF蛋白在A组大鼠未损伤脊髓组织中均低水平表达。B组与A组相比,脊髓损伤后COX-2蛋白表达水平明显增加（P＜0.01）,VEGF蛋白表达水平则短暂显著增加（P＜0.05）。C组与B组相比, COX-2和VEGF蛋白表达水平均显著增加。结论 BMSCs移植能够增加脊髓损伤后COX-2、VEGF蛋白的表达。     

碱性成纤维细胞生长因子对大鼠牵张性脊髓损伤后c-fos基因表达的影响

目的观察碱性成纤维细胞生长因子(basicfibroblast growthfactor,bFGF)对牵张性脊髓损伤后c-fos基因表达的影响.方法用特制的脊柱撑开器放置在大鼠脊髓T12～L3椎体横突上纵向牵张,同时皮层体感诱发电位监测,建立大鼠牵张性脊髓损伤模型.用免疫组织化学染色法观察c-fos基因的表达,并用计算机图像分析系统进行定量分析.结果脊髓损伤后神经元C-FOS蛋白D值较正常组显著增加,表达高峰出现在损伤后2 h,而bFGF治疗组在各时相点均低于对照组(P＜0.05,P＜0.01).结论碱性成纤维细胞生长因子能显著抑制脊髓损伤后c-fos基因的表达,这可能是bFGF保护神经元并减轻脊髓损伤的机制之一.     

Expression of Vascular endothelial growth factor (VEGF) and VEGF-C in serum and tissue of Wilms tumor

Background  Angiogenesis and lymphogenesis which were promoted by vascular endothelial growth factor (VEGF) and VEGF-C are important in the growth and metastasis of solid tumors. The high level of VEGF and VEGF-C were distributed in numerous types of cancers, but their distribution and expression in Wilms tumor, the most common pediatric tumor of the kidney, was unclear.

Methods  To learn about the distribution, mass spectroscopy and immunohistochemistry were used to measure the level of VEGF and VEGF-C in serum and tissue of Wilms tumor.

Results  The expression level of VEGF in serum of Wilms tumor was the same as in pre-surgery and control, so it was the same case of VEGF-C. Both of these factors were chiefly located in Wilms tumor tissue, but not in borderline and normal. In addition, the higher clinical staging and histopathologic grading were important elements in high expression of VEGF and VEGF-C. Gender, age and the size of tumor have not certainly been implicated in expression level of VEGF and VEGF-C.

Conclusions  The lymph node metastasis and growth of tumors resulted from angiogenesis and lymphogenesis which were promoted by VEGF and VEGF-C in Wilms tumor. The autocrine and paracrine process of VEGF and VEGF-C were the principal contributor to specific tissues of Wilms tumor but not to the entire body.

     

Expression of Vascular Endothelial Growth Factor （VEGF） in Human Osteosarcoma Cells Transfected with Adeno-associated Virus-antisense VEGF

Ithasbecomeacommonmethodforcancertreatmentthroughantivascularizationinthepresent.Somestudieshaverevealedthatlivercancer ,lungcancerandcervicalcancercanbetreatedsuccessfullythroughholdingbackvascularendothelialgrowthfac tor (VEGF) proteinbecauseofitsimport…     

脊髓损伤(SCI)后呼吸运动功能的恢复

 高颈段脊髓损伤(spinal cord injury,SCI)往往导致膈肌麻痹,了解如何恢复SCI患者膈神经的节律活动至关重要。控制膈运动神经元(phrenic motor neuron,PhMn)的兴奋性前运动神经元主要起源于同侧延髓,因此,当C2脊髓半离断(spinal cord hemisection,SH)后,损伤侧的下行冲动中断,同侧膈神经的节律消失。随后,潜在的对侧下行冲动逐渐增强(神经可塑性),使PhMn的节律性活动恢复。众多证据表明神经营养因子(如脑源性神经营养因子,brain derived neurotrophic factor, BDNF)通过原肌球蛋白相关激酶受体(如TrkB)在神经可塑性中发挥重要作用。我们的实验结果表明,在鞘膜内注射BDNF能促进PhMn节律性的恢复,而注射TrkB-Fc(一种可抑制细胞外BDNF的融合蛋白)则延迟恢复。应用腺病毒载体(adeno-associated viral vector,AVV)靶向诱导PhMn中TrkB的表达也可促进PhMn节律性的恢复,而Si-RNA诱导的PhMn中TrkB表达抑制则延缓恢复。总之,增强PhMn的BDNF-TrkB信号通路可能是促进SCI后功能恢复的有效治疗手段。