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• W1972103663 abstract "Transforming growth factor-β (TGF-β) is a major pro-fibrotic cytokine, causing the overproduction of extracellular matrix molecules in many fibrotic diseases. Inhibition of its type-I receptor (ALK5) has been shown to effectively inhibit fibrosis in animal models. However, apart from its pro-fibrotic effects, TGF-β also has a regulatory role in the immune system and influences tumorigenesis, which limits the use of inhibitors. We therefore explored the cell-specific delivery of an ALK5-inhibitor to hepatic stellate cells, a key cell in the development of liver fibrosis. We synthesized a conjugate of the ALK5-inhibitor LY-364947 coupled to mannose-6-phosphate human serum albumin (M6PHSA), which binds to the insulin-like growth factor II receptor on activated HSC. The effectivity of the conjugate was evaluated in primary HSC and in an acute liver injury model in mice. In vitro, the free drug and the conjugate significantly inhibited fibrotic markers in HSC. In hepatocytes, TGF-β-dependent signaling was inhibited by free drug, but not by the conjugate, thus showing its cell-specificity. In vivo, the conjugate localized in desmin-positive cells in the liver and not in hepatocytes or immune cells. In the acute liver injury model in mice, the conjugate reduced fibrogenic markers and collagen deposition more effectively than free drug. We conclude that we can specifically deliver an ALK5-inhibitor to HSC using the M6PHSA carrier and that this targeted drug reduces fibrogenic parameters in vivo, without affecting other cell-types." @default.
• W1972103663 created "2016-06-24" @default.
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• W1972103663 date "2013-02-18" @default.
• W1972103663 modified "2023-10-03" @default.
• W1972103663 title "Enhanced Effectivity of an ALK5-Inhibitor after Cell-Specific Delivery to Hepatic Stellate Cells in Mice with Liver Injury" @default.
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• W1972103663 doi "https://doi.org/10.1371/journal.pone.0056442" @default.
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