Abstract
The antineoplastic antibiotic, bleomycin, is known to induce a well-recognized model of lung fibrosis. Active transforming growth factor-beta1 (TGF-beta1) plays a key role in lung fibrosis induced by bleomycin, TSP-1 (thrombospondin-1) being critical to the activation of L (latent)-TGF-beta1 by virtue of an association of the TSP-1/L-TGF-beta1 complex with CD36, involving the sequence CSVTCG of the TSP-1 functional fragment. To observe the inhibitory effects of TSP-1 functional fragments, critical for CD36 binding, on the activation of L-TGF-beta1, we isolated alveolar macrophages from Wistar rat lungs 7 days after bleomycin administration (5mg/kg body weight) and cultured the cells with or without TSP-1 functional or control fragments. We observed a cell surface association of TGF-beta1 with CD36 by immunofluorescence and quantified the active and total TGF-beta1 by ELISA. The co-localization of CD36 with TGF-beta1, shown by a yellow fluorescence deriving from a mixture of the green and red of the two components, for the TSP-1 functional fragment groups was clearly less than that of the TSP-1 control fragment groups. The quantities and the percentages of active TGF-beta1 in the TSP-1 functional fragment groups were lower than ...Continue Reading
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