Objective To investigate the expression of ligands of DNAM-1 and NKG2D in the colonic cancer.Methods The colonic cancer tissue and adjacent normal colonic tissues were collected from 42 colonic cancer patients who were admitted to the Tangdu Hospital of Fourth Military Medical University from June 2010 to January 2011 were retrospectively analyzed.The expressions of CD155,CD112 and MICA/B in the colonic cancer tissues and the normal colonic tissues were detected by immunohistochemistry.The expressions of CD155,CD112 and MICA/B in the colonic cell line SWll6,SW480,SW620 and Colo205 in the Duke's A,B,C and D phases were detected by cell cytometry.The relationship of the expressions of the 3 ligands and the clinicopathological parameters was analyzed using the Mann-Whitney U test,chi-square test and Fisher exact probobility.Results Week expression of CD155 was found in the normal colonic tissues,while the expressions of CD112 and MICA/B were not found.In the colonic cancer tissues,the expressions of CD155,CD112 and MICA/B were 81.0％,52.4％ and 47.6％,which were significantly increased.The expressions of CD155,CD112 and MICA/B were not correlated with the gender,tumor differentiation,lymph node metastasis and Duke's staging (P ＞ 0.05).The overall expression rates of CD155,CD112 and MICA/B in the colonic cancer cell line SWll6,SW480,SW620 and Colo205 were 88.9％,67.4％ and 42.3％,respectively.The overall expression of CD155 was significantly higher than CD112 and MICA/B (F =23.17,P ＜ 0.05).Conclusion CD155,CD112 and MICA/B express in the colonic cancer tissues and colonic cancer cell line SW116,SW480,SW620 and Colo205,and the expression of CD155 is the highest.

Objective To discuss the antitumor effect of snake venom toxins and its application in medical field .Methods To review the research progress of composition ,the antitumor effect and mechanism of snake venom toxins .Results It was demonstrated that the snake venom toxins can stop various tumor cells from growing ,and have the functions of killing the tumor cells ,inducing cell death ,and inhibition of angiogenesis .Conclusion It is an important direction in antitumor drug re-search and development to deeply research the composition and the mechanisms of action of the snake venom toxins .