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Transforming growth factor β1 involvement in the conversion of fibroblasts to smooth muscle cells in the rabbit bladder serosa

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Abstract

In an attempt to identify the growth factors or cytokines involved in the serosal thickening that occurs in rabbit bladder subjected to partial outflow obstruction, the following growth factors – transforming growth factor β1, platelet-derived growth factor, epidermal growth factor, granulocyte colony-stimulating factor and granulocyte–monocyte colony-stimulating factor – were delivered separately onto the serosal surface of the intact bladder via osmotic minipumps. The proliferative/differentiative cellular response of the rabbit bladder wall was evaluated by bromodeoxyuridine incorporation and immunofluorescence staining with a panel of monoclonal antibodies to cytoskeletal proteins (desmin, vimentin, keratins 8 and 18 and non-muscle myosin) and to smooth muscle (α-actin, myosin and SM22) proteins. Administration of the transforming growth factor, but not of the other growth factors/cytokines, was effective in inducing serosal thickening. Accumulating cells in this tissue were identified as myofibroblasts, i.e. cells showing a mixed fibroblast–smooth muscle cell differentiation profile. The phenotypic pattern of myofibroblasts changed in a time-dependent manner: 21 days after the growth factor delivery, small bundles of smooth muscle cells were found admixed with myofibroblasts, as occurs in the obstructed bladder. These ‘ectopic’ muscle structures displayed a variable proliferating activity and expressed an immature smooth muscle cell phenotype. The complete cellular conversion to smooth muscle cells was not achieved if transforming growth factor β1 was delivered to fibroblasts of subcutaneous tissue. These findings suggest a tissue-specific role for this growth factor in the cellular conversion from myofibroblast to smooth muscle cells. © 1998 Chapman & Hall

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Roelofs, M., Faggian, L., Pampinella, F. et al. Transforming growth factor β1 involvement in the conversion of fibroblasts to smooth muscle cells in the rabbit bladder serosa. Histochem J 30, 393–404 (1998). https://doi.org/10.1023/A:1003216124761

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