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• W2080495834 abstract "Chronic liver injury leads to a progressive wound healing response that eventually results in hepatic fibrosis characterised by net deposition of fibrillar extracellular matrix (ECM) and a qualitative shift from type IV to type I/III collagen. The pivotal cellular event underlying this response is hepatic stellate cell (HSC) activation towards a myofibroblast-like phenotype. Activated HSC contribute to ECM remodelling via secretion of type I/III collagens and matrix metalloproteinases (MMPs). Previous studies showed that three-dimensional (3D) contact of activated HSC with type I collagen further stimulates the ECM remodelling properties of HSC by inducing the type IV gelatinase, MMP-9. The aim of the current study was to confirm transcriptional activation of the MMP-9 gene and identify transcription factors regulating this response. Gelatin zymography and Northern blotting were used to confirm induction of MMP-9 protein and mRNA expression in primary rat HSC cultured in a three-dimensional collagen I gel lattice. MMP-9 promoter studies in transfected HSC and electrophoretic mobility shift assay (EMSA) were employed to study transcriptional events. Both NF-kappaB and AP-1 DNA were induced in HSC cultured in 3D collagen I gels and binding sites for these factors in the MMP-9 promoter were crucial for induction of transcription. By contrast removal of an Sp1 site in the promoter enhanced transcription, while over-expression of either Sp1 or Sp3 repressed transcription. It is concluded that 3D contact of activated HSC with collagen I stimulates MMP-9 expression by elevating NF-kappaB and AP-1 activities which are able to overcome the repressive influence of Sp1/Sp3 on MMP-9 gene transcription." @default.
• W2080495834 created "2016-06-24" @default.
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• W2080495834 date "2004-02-01" @default.
• W2080495834 modified "2023-10-15" @default.
• W2080495834 title "Induction of myofibroblast MMP-9 transcription in three-dimensional collagen I gel cultures: regulation by NF-κB, AP-1 and Sp1" @default.
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• W2080495834 doi "https://doi.org/10.1016/s1357-2725(03)00260-7" @default.
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