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Understanding of the mechanisms by which epithelial tumor cells induce their supportive stroma in carcinomas is of great general interest for the development of new therapeutic anticancer strategies. In the present study we investigated whether polarized colorectal carcinoma cells (Caco-2) release well-known stroma-inducing factors diffusely or specifically at the stroma-oriented cell pole. We demonstrate that Caco-2 cells secrete vascular endothelial growth factor, tumor necrosis factor alpha and platelet-derived growth factor preferentially towards a basolateral stroma-oriented direction. Other cytokines such as several interleukines, basic fibroblastic growth factor and prostaglandin E2 are not secreted in significant amounts by Caco 2 cells. We conclude that the directed secretion of stroma-regulating factors might play a central role in the regulation of both tumor angiogenesis and tumor invasion in carcinomas with a polarized growth pattern.


Journal article


Anticancer research

Publication Date





137 - 141


Department of Pathology, University of Bonn, P.O. Box 2120, 53011 Bonn, Germany.


Caco-2 Cells, Stromal Cells, Humans, Colorectal Neoplasms, Growth Substances, Intercellular Signaling Peptides and Proteins, Vascular Endothelial Growth Factors, Vascular Endothelial Growth Factor A, Endothelial Growth Factors, Platelet-Derived Growth Factor, Tumor Necrosis Factor-alpha, Interleukins, Lymphokines, Enzyme-Linked Immunosorbent Assay