内皮抑素对小鼠肺腺癌LA795生长和转移抑制作用的初步研究

目的：观察人内皮抑互对小鼠肺腺癌ＬＡ７９５生长和转移的抑制作用。方法：对重组人内皮抑素高效表达克隆ｐＣＸ的表达产物进行纯化，得到重组人内皮抑素（ｒｈＥＳ）。用亲和层析及胰弹性蛋白酶消化法从过期人血浆纯化得到人血管抑素（ｈＡＳ）。将接种ＬＡ７９５肺腺癌细胞的Ｔ７３９小鼠随机分成３组，分别给予ｒｈＥＳ，ｈＡＳ或等体积ＰＢＳ皮下注射，１次／日，共１４ｄ。观察３组肿瘤生长情况、肺湿重、肺表面转移结节数、动物生存期，分别进行ｑ检验。结果：ｒｈＥＳ组及ｈＡＳ组肿瘤生长缓慢，８ｄ后肿瘤逐渐回缩；肺湿重、肺表面转移结节数明显减少，动物生存期明显延长。结论：ｒｈＥＳ与ｈＡＳ均可明显抑制ＬＡ７９５所致的小鼠实验性肿瘤的生长与转移，延长动物的生存期。

The Inhibition of Endostatin on Tumor Growth and Metastasis of Lung Adenocarcinoma LA795 in Mice

Objective: To evaluate the inhibition of human endostatin on tumor growth and metastasis of lung adenocarcinoma LA795 in mice. Methods: Recombinant human endostatin was purified from pCX expressed endostatin clones. Plasminogen was purified from outdated human plasma by affinity chromatography, and human angiostatin was produced from human plasminogen digested by elastase and purified by affinity chromatography. LA795 cells were inoculated subcutaneously into the dorsa of T739 mice, and the mice were randomized into 3 groups. From the 10th day, the first group was given 20 mg/kg of recombinant human endostatin s.c. qd, the second was treated daily s.c.of 7.5 mg/kg of human angiostatin, and the third group received daily s.c. with equal volumes of PBS for 14 days. Volumes of the subcutaneous tumors, lung weights, the number of lung surface metastases and mice life span were observed. The results were analyzed by q test. Results: The tumor volumes of both the 1st and the 2nd groups increased slowly. From the 8th day after being treated, the tumor volumes were decreasing. However, in the 3rd group, the tumor volumes increased continuously. The lung weight and the number of lung surface metastases of the 1st and 2nd groups were less than that of the 3rd group. The average survival periods of the 1st and 2nd groups were longer than that of the 3rd group. Conclusion: Human endostatin and angiostatin have strong inhibitory effects both on growth of primary tumor and metastasis of lung adenocarcinoma LA795, and prolongs the survival period of the tumor bearing mice.