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• W2024873415 abstract "Renal fibroblasts play a major role in the pathogenesis of renal interstitial fibrosis. This process is associated at least in some forms of interstitial fibrosis with a differentiation of fibroblasts into myofibroblasts, characterized by the de novo expression of alpha-smooth muscle (alpha-sm) actin and/or desmin. Both the mechanisms underlying this differentiation and their effects on cellular function are poorly understood. In vitro studies are difficult since the phenotypes of fibroblasts in culture have as yet not been well defined. We have, therefore, examined the phenotype of inner medullary fibroblasts (IMF) during the transition from in vivo to in vitro in various cell fractions derived from the inner medulla of healthy rats. IMF were positive for the lectin BSL-1 and negative for markers of endothelial cells. IMF first lost their prominent lipid droplets in vitro. Subsequently they developed cytoplasmic processes accompanied by a decrease in their reactivity for the lectin BSL-1 from strong to weak. From day 3 in primary culture, exclusively these weakly positive BSL-1 cells showed a de novo expression of alpha-sm actin (day 4 of primary culture, 75 +/- 4%; day 20, 94 +/- 2%) and desmin (day 4, 43 +/- 8%; day 20, 66 +/- 6%), classifying them as myofibroblasts. This transformation depended on culture conditions. In a mixed coculture with inner medullary collecting duct (IMCD) cells the transformation of IMF was largely absent: a significantly greater number of strong BSL-1 positive cells contained prominent lipid droplets (39 +/- 4 vs. 19 +/- 4%, P < 0.05) on day 4 of primary culture, and the transition of strongly to weakly positive BSL-1 IMF was almost completely blocked. By reducing the seeding density of IMCD cells the effect of this condition on IMF transformation could be largely abolished. This first detailed phenotypic characterization of rat fibroblasts during the transition from in vivo to in vitro demonstrates that these cells-depending on culture conditions-differentiate to myofibroblasts within a few days of primary culture and that subcultured IMF exhibit predominantly this phenotype. The presented model may serve as a useful tool for the in vitro study of myofibroblast formation and the consequences of such a differentiation for the physiological functions of IMF." @default.
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• W2024873415 date "1997-11-01" @default.
• W2024873415 modified "2023-10-01" @default.
• W2024873415 title "Transformation of rat inner medullary fibroblasts to myofibroblasts in vitro" @default.
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• W2024873415 doi "https://doi.org/10.1038/ki.1997.453" @default.
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