人血管抑制因子Vasostatin短片段（120 180 aa）的克隆、表达及功能研究

目的：利用基因工程技术，克隆并表达人血管抑制因子Vasostatin120180 aa功能区片段，探讨其对鸡胚绒毛尿囊膜新生血管抑制的作用。方法：采用PCR技术扩增人血管抑制因子Vasostatin120180 aa功能区基因，并利用pQE30原核表达系统诱导表达Vasostatin120180aa，经镍金属螯合层析法纯化，通过鸡胚绒毛尿囊膜实验验证其抑制新生血管生成的作用。结果：PCR扩增出了长度为180 bp的Vasostatin120180 aa功能区基因，后经pQE30原核表达系统表达并纯化出Vasostatin120180 aa，SDSPAGE显现一条约8 kD的阳性条带，Vasostatin120180aa可显著抑制鸡胚绒毛尿囊膜新生血管的生成。结论：原核表达的Vasostatin120180 aa功能区片段具有生物学活性，可明显抑制鸡胚绒毛尿囊膜新生血管的生成，在一定范围内呈量效依赖性。

Clonging and Expression of Recombinant Human Vasostatin's Domain and Its Ability to Inhibit Angiogenesis in CAM

Objective: To clone and express the recombinant human Vasostatin120-180aa domain and to investigate its activity of inhibiting angiogenesis in CAM. Methods: After amplifying gene of human Vasostatin120-180aa domain, we sub-cloned it into pQE30 vector and expressed Vasostatin120-180aa domain by E. coli. We also tested its ability of inhibiting angiogenesis in CAM. Results: The total gene length of human Vasostatin120-180aa domain is 180 bp. Expressed by pQE30 system in E. coli and purified by IMAC, Vasostatin120-180aa was detected by SDS-PAGE, in which there is a positive band and molecular weight is about 8 kD. Conclusions: Recombinant human Vasostatin120-180aa could play effective role in anti-angiogenesis in CAM and it showed a dose dependent effect in some degree.