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Gamma-Secretase Inhibitors Downregulate the Profibrotic NOTCH Signaling Pathway in Recessive Dystrophic Epidermolysis Bullosa. | LitMetric

AI Article Synopsis

  • Recessive dystrophic epidermolysis bullosa (RDEB) is a rare skin disorder caused by mutations in the COL7A1 gene, leading to persistent blistering and fibrosis without a cure.
  • The study focuses on the NOTCH signaling pathway, which is implicated in the fibrosis associated with RDEB, and examines the effects of γ-secretase inhibitors, specifically DAPT and PF-03084014 (nirogacestat), on RDEB fibroblasts.
  • Results show that inhibiting NOTCH signaling with PF-03084014 reduces fibrotic traits such as contractility and collagen secretion in RDEB fibroblasts, offering potential new therapeutic strategies for managing RDEB-associated fibrosis.

Article Abstract

Recessive dystrophic epidermolysis bullosa (RDEB) is a rare skin fragility disorder caused by mutations in COL7A1. RDEB is hallmarked by trauma-induced unremitting blistering, chronic wounds with inflammation, and progressive fibrosis, leading to severe disease complications. There is currently no cure for RDEB-associated fibrosis. Our previous studies and increasing evidence highlighted the profibrotic role of NOTCH pathway in different skin disorders, including RDEB. In this study, we further investigated the role of NOTCH signaling in RDEB pathogenesis and explored the effects of its inhibition by γ-secretase inhibitors DAPT and PF-03084014 (nirogacestat). Our analyses demonstrated that JAG1 and cleaved NOTCH1 are upregulated in primary RDEB fibroblasts (ie, RDEB-derived fibroblasts) compared with controls, and their protein levels are further increased by TGF-β1 stimulation. Functional assays unveiled the involvement of JAG1/NOTCH1 axis in RDEB fibrosis and demonstrated that its blockade counteracts a variety of fibrotic traits. In particular, RDEB-derived fibroblasts treated with PF-03084014 showed (i) a significant reduction of contractility, (ii) a diminished secretion of TGF-β1 and collagens, and (iii) the downregulation of several fibrotic proteins. Although less marked than PF-03084014-treated cells, RDEB-derived fibroblasts exhibited a reduction of fibrotic traits also upon DAPT treatment. This study provides potential therapeutic strategies to antagonize RDEB fibrosis onset and progression.

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Source
http://dx.doi.org/10.1016/j.jid.2023.10.045DOI Listing

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