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- W2007409274 abstract "Bronchiolitis obliterans syndrome (BOS), chronic lung allograft rejection, remains an impediment for the function of the transplanted organ. In this study, we defined the role of the microRNA (miRNA) miR-144 in fibroproliferation leading to BOS.Biopsy specimens were obtained from 20 lung transplant recipients with BOS(+) and 19 without BOS(–). Expression of miR-144 and its target, transforming growth factor-β (TGF-β)–induced factor homeobox 1(TGIF1), were analyzed by real-time polymerase chain reaction and Western blot. Overexpression of miR-144 and luciferase reporter genes were performed to elucidate miRNA-target interactions. The function of miR-144 was evaluated by transfecting fibroblasts and determining the response to TGF-β by analyzing Sma- and Mad-related family (Smads), fibroblast growth factor, TGF-β, and vascular endothelial growth factor. Smooth muscle actin-α–positive stress fibers and F-actin filaments in lung fibroblasts were analyzed by immunofluorescence.Analysis of miR-144 in the biopsy specimens demonstrated 4.1 ± 0.8-fold increases in BOS+ compared with BOS– patients, with a significant reduction in TGIF1 (3.6 ± 1.2-fold), a corepressor of Smads. In vitro transfection confirmed that over-expression of miR-144 results in a reduction in TGIF1 and an increase in SMAD2, SMAD4, fibroblast growth factor-6, TGF-β, and vascular endothelial growth factor. Increasing miR-144 by transfecting, increased smooth muscle actin-α and fibronectin, and knockdown of miR-144 diminished fibrogenesis in MRC-5 fibroblasts.miR-144 is a critical regulator of the TGF-β signaling cascade and is over-expressed in lungs with BOS. Therefore, miR-144 is a potential target toward preventing fibrosis leading to BOS after lung transplant." @default.
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- W2007409274 date "2001-01-01" @default.
- W2007409274 modified "2023-09-27" @default.
- W2007409274 title "Cities for Children: Children's Rights, Poverty and Urban Management" @default.
- W2007409274 doi "https://doi.org/10.1016/s1352-0237(02)00386-6" @default.
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