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• W3138592166 abstract "Abstract Fibroblastic reticular cells (FRC) are immunologically specialized fibroblasts controlling the size and microarchitecture of the lymph node (LN), partly through their contractile properties. Swelling is a hallmark of tumor-draining LN in lymphophilic cancers such as cutaneous melanoma, a very aggressive and heterogeneous tumor with high risk of early metastasis. Melanoma cells can dynamically switch between melanocytic proliferative and dedifferentiated mesenchymal-like invasive phenotypes, which are characterized by distinct transcriptional signatures. Melanoma secreted cues, such as extracellular vesicles, growth factors or proinflammatory cytokines, promote LN stroma remodeling and metastatic spreading. But how FRC integrate these pro-metastatic signals and modulate their contractile functions remains poorly characterized. Here, we show that factors secreted by dedifferentiated melanoma cells, but not by melanocytic cells, strongly inhibit FRC actomyosin-dependent contractile forces by decreasing the activity of the RHOA-ROCK pathway and the mechano-responsive transcriptional co-activator YAP, leading to a decrease in F-actin stress fibers and cell elongation. Transcriptional profiling and biochemical analyses indicate that FRC actomyosin cytoskeleton relaxation is driven by inhibition of JAK1 and its downstream transcription factor STAT3, and is associated with increased FRC proliferation and activation. Interestingly, dedifferentiated melanoma cells reduce FRC contractility in vitro independently of extracellular vesicle secretion. These data show that FRC are specifically modulated by proteins secreted by invasive dedifferentiated melanoma cells and suggest that melanoma-derived cues could modulate the biomechanical properties of distant LN before metastatic invasion. They also highlight that JAK1-STAT3 and YAP signaling pathways contribute to the maintenance of the spontaneous contractility of resting human FRC." @default.
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• W3138592166 date "2021-03-25" @default.
• W3138592166 modified "2023-10-10" @default.
• W3138592166 title "Invasive dedifferentiated melanoma cells inhibit JAK1-STAT3-driven actomyosin contractility of human fibroblastic reticular cells of the lymph node" @default.
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• W3138592166 doi "https://doi.org/10.1101/2021.03.25.436913" @default.
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