Induction of endothelial cell differentiation in vitro by fibroblast-derived soluble factors

Experimental Cell Research
M Kuzuya, J L Kinsella

Abstract

Recent studies have suggested that fibroblasts, widely distributed mesenchymal cells, not only function to sustain various organs and tissues as stroma cells but also act directly to regulate adjacent cell behavior including migration, proliferation, and differentiation. Since fibroproliferative diseases and lesions (fibroplasia) are accompanied by new capillary growth (angiogenesis), we hypothesized that fibroblasts may have direct effects on endothelial cell behavior, independent of the elaboration of extracellular matrix, that are relevant to complex process of angiogenesis. To test this hypothesis, bovine aortic endothelial cells were cocultured in collagen gels with human skin fibroblasts. This coculture system caused the endothelial cells to become spindle shaped and to organize into a capillary-like structure within the collagen gels. We found that fibroblast-conditioned medium (FCM) also induced endothelial cells initially to elongate and subsequently to organize into a capillary-like structure within collagen gels. While FCM had no significant effect on endothelial cell DNA synthesis, the soluble factor(s) in FCM increased endothelial cell motility in an in vitro wound assay and in a Boyden chamber assay. The chemoattr...Continue Reading

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