[Study on the angiogenic ability of tumor fibroblasts]

To explore the role of fibroblasts derived from tumor in the tumor angiogenesis.

Two-well co-culture system were used to detect the expression of MMP-9, TGF-beta1, TN and bcl-2 in L929-H22 cells, and their ability of promoting angiogenesis of ECV304 cells and invasion of MDA-MB-231 cells respectively, which were established in our laboratory before. Then their adhesion and the effect of their supernatant on H22 cells proliferation were analysed.

Compared with L929 cells, the adhesion potential of L929-H22 cells increased (F>or=104.32, P<0.001), with the higher level of expression of MMP-9, bcl-2, TN, and TGF-beta1 in L929-H22 cells in creased (t>or=3.3055, P<0.01). L929-H22 and L929 cells enhanced the invasiveness of human mammary cancer MDA-MB-231 cells through artificial basement membrane (Matrigel) 1.21 and 0.48 times respectively (F=266.3, P<0.001). L929-H22 cells induced morphogenesis of ECV304 cells. L929-H22 stimulated endothelial cells to form more and longer tubes than L929 did (F>or=23.75, P<0.01). 25% CM of L929-H22 cells stimulated the growth of H22 cells (F=266.30, P<0.05).

The results suggested that fibroblasts in tumors secrete more growth factors and angiogenic factors to promote the angiogenesis and invasion of solid tumors.