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- W2022123603 abstract "Human bone marrow fibroblasts were cultivated and characterized by immunofluorescent staining and electron microscopy. Their interactions with PDGF and TGF beta were studied. While a positive intracellular antifibronectin staining was observed, the cultured cells were not labeled with specific antibodies toward factor VIII von Willebrand factor (F VIII/vWF), desmin, and macrophage antigen. Moreover, electron microscopy excluded the presence of endothelial cells by the absence of Weibel-Palade bodies. The binding of pure human PDGF to the cultured bone marrow fibroblasts was investigated. Addition of an excess of unlabeled PDGF decreased the binding to 75 and 80%, which means that the nonspecific binding represented 20-25% of total binding, whereas epidermal growth factor (EGF) had no effect. Two classes of sites were detected by Scatchard analysis with respectively 21,000 and 37,000 sites per cell, with a KD of 0.3 x 10(-10) M and KD of 0.5 x 10(-9) M. The stimulation of DNA synthesis by PDGF was quantified by [3H]thymidine incorporation. When PDGF was added alone at a concentration of 15 ng/ml, it induced a maximal DNA synthesis of 400%, which increased up to 900%, in the presence of platelet-poor plasma (PPP). On the other hand, PDGF-induced fibroblast proliferation was inhibited in a dose-dependent manner by TGF beta. This inhibition was related to a significantly decreased binding of 125I-labeled PDGF observed in the presence of TGF beta. Our results suggested that PDGF and TGF beta could modulate the growth of bone marrow fibroblasts." @default.
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- W2022123603 date "1988-12-01" @default.
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- W2022123603 title "Transforming growth factor (TGF?) decreases the proliferation of human bone marrow fibroblasts by inhibiting the platelet-derived growth factor (PDGF) binding" @default.
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- W2022123603 doi "https://doi.org/10.1016/0014-4827(88)90270-4" @default.
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