Abstract
Hyperplasia of transitional cell epithelium adjacent to human transitional cell carcinomas (TCC) is a common finding in pathology. This hyperplasia may be a precancerous aberration. Alternatively, it has been suggested that the hyperplasia is due to paracrine action of tumour-derived growth factors. In this study we tested the latter hypothesis using the mouse tumorigenic TCC cell line NUC-1. Transplantation of NUC-1 tumour cells into the urinary bladder submucosa of syngeneic mice in vivo induced hyperplasia of normal adjacent urothelium in all tested mice. Implantation of normal mouse bladder mucosa did not induce urothelial hyperplasia. In vitro, conditioned medium of NUC-1 cells induced the proliferation of the mouse urothelial cell line g/G, which closely resembles normal urothelial cells. This induction was inhibited by transforming growth factor β1 (TGFβ1). Similarly, TGFβ1 inhibited the fibroblast growth factor-1 (FGF-1) and FGF-2 induced proliferation of g/G cells. Chemico-physical examination, bioassays with conditioned media, and RNA analysis of NUC-1 cells revealed that these cells secreted a growth factor with FGF-like properties. These results indicate that epithelial hyperplasia surrounding carcinomas is not necessarily a precancerous aberration, but may result from direct paracrine action of tumour-derived growth factors.
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de Boer, W.I., Rebel, J.M.J., Thijssen, C.D.E.M. et al. Hyperplasia of epithelium adjacent to transitional cell carcinoma can be induced by growth factors through paracrine pathways. Vichows Archiv A Pathol Anat 425, 439–444 (1994). https://doi.org/10.1007/BF00189583
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DOI: https://doi.org/10.1007/BF00189583