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Van de Velde, Maureen; Ebroin, Marie; Durré, Tania; Joiret, Marc; Gillot, Lionel; Blacher, Silvia; Geris, Liesbet; Kridelka, Frédéric; Noel, Agnès
Cancer letters, 01/2021, Letnik: 497Journal Article, Web Resource
Solid tumors are composed of tumor cells and stromal cells including lymphatic endothelial cells (LEC), which are mainly viewed as cells forming lymphatic vessels involved in the transport of metastatic and immune cells. We here reveal a new mechanism by which tumor exposed-LEC (teLEC) exert mitogenic effects on tumor cells. Our conclusions are supported by morphological and molecular changes induced in teLEC that in turn enhance cancer cell invasion in 3D cultures and tumor cell proliferation in vivo. The characterization of teLEC secretome by RNA-Sequencing and cytokine array revealed that interleukine-6 (IL6) is one of the most modulated molecules in teLEC, whose production was negligible in unexposed LEC. Notably, neutralizing anti-human IL6 antibody abrogated teLEC-mediated mitogenic effects in vivo, when LEC were mixed with tumor cells in the ear sponge assay. We here assign a novel function to teLEC that is beyond their role of lymphatic vessel formation. This work highlights a new paradigm, in which teLEC exert “fibroblast-like properties”, contribute in a paracrine manner to the control of tumor cell properties and are worth considering as key stromal determinant in future studies. •teLEC, but not normal LEC, produce huge amount of IL6.•IL6-derived teLEC exert mitogenic effect on tumor cells, in the primary tumor.•teLEC act as fibroblast-like cells in the tumor microenvironment.•It warrants to revisit the “vascular-centric view” of LECs.
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