关键词: 肿瘤微环境, 大肠癌, 免疫组织化学

Abstract:

Background and purpose: Cancer microenvironment has become a hot topic of cancer research. It is important in the initiation of colorectal cancer. This study aimed to discuss the correlation between the characteristics of tissue culture in vitro and different cell types in cancer microenvironment. Methods: Samples were collected at different distances from the colorectal cancer lesions, which were named as positions 1, 2 and 3 from distal to proximal. Tissues were cut into 1-2 mm3 for in vitro culturing. HE staining was used to observe the structure of crypts. Immunohistochemistry was used to detect the expressions of Cyclin D1 (CD1), CD133, cytokeratin18 (CK18), vimentin and α-smooth muscle actin (α-SMA). Results: Position 3 grew faster than position 2 and position 1. As getting closer to the colorectal cancer lesions, expressions of CD1, CD133, vimentin and α-SMA were increased while expression of CK18 was decreased. Conclusion: The tissue structure and the expression of different cell types in cancer microenvironment changed more seriously as getting closer to the colorectal cancer lesions. This indicated that the change of cancer microenvironment may contribute to the initiation of colorectal cancer.

Key words: Cancer microenvironment, Colorectal cancer, Immunohistochemistry