[Tumor conditioned medium regulates the proliferation, adhesion and migration of human umbilical vein endothelial...

The aim of the present study was to investigate the effects of tumor conditioned medium (TCM) on the proliferation, adhesion and migration of human umbilical vein endothelial cell (HUVEC). Cells were divided into control group, TCM stock solution group, TCM monodilution group and TCM didilution group (n = 6), and MTT assay was used to determine endothelial cells proliferation level after being stimulated with TCM for 24 h. Coating culture dishes with Fn was used to detect the adhesion ability of endothelial cells to basement membrane in control group and TCM stock solution group (n = 6). Wound closure model was used to test the migration ability of endothelial cells in control group and TCM stock solution group at 12 h and 24 h (n = 6). The results showed that TCM at different concentrations influenced proliferation of endothelial cells in distinct degree. Compared to the control group (absorbance value: 0.58 ± 0.04), the stock solution had no effect on proliferation of endothelial cells (absorbance value: 0.55 ± 0.01). However, the TCM monodilution and TCM didilution enhanced the proliferation of endothelial cells significantly (absorbance value: 0.66 ± 0.03, P < 0.01 and 0.70 ± 0.02, P < 0.001 separately). TCM downregulated the adhesion of endothelial cells to basement membrane. Moreover, compared to the migration distance of control group at 12 h and 24 h [(14.05 ± 6.25) µm and (48.75 ± 16.37) µm separately], TCM upregulated the basement membrane migration [(68.25 ± 26.20) µm and (119.70 ± 34.90) µm at 12 h and 24 h, both P < 0.05 separately]. These results suggest that TCM downregulates the adhesion ability of endothelial cells and upregulates their migration ability, and thus facilitates tumor metastasis.