Abstract:
:Breast cancer metastasis involves lymphatic dissemination in addition to hematogenous spreading. Although stromal lymphatic vessels (LVs) serve as initial metastatic routes, roles of organ-residing LVs are underinvestigated. Here we show that lymphatic endothelial cells (LECs), a component of LVs within pre-metastatic niches, are conditioned by triple-negative breast cancer (TNBC) cells to accelerate metastasis. LECs within the lungs and lymph nodes, conditioned by tumour-secreted factors, express CCL5 that is not expressed either in normal LECs or in cancer cells, and direct tumour dissemination into these tissues. Moreover, tumour-conditioned LECs promote angiogenesis in these organs, allowing tumour extravasation and colonization. Mechanistically, tumour cell-secreted IL6 causes Stat3 phosphorylation in LECs. This pStat3 induces HIF-1α and VEGF, and a pStat3-pc-Jun-pATF-2 ternary complex induces CCL5 expression in LECs. This study demonstrates anti-metastatic activities of multiple repurposed drugs, blocking a self-reinforcing paracrine loop between breast cancer cells and LECs.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Lee E,Fertig EJ,Jin K,Sukumar S,Pandey NB,Popel ASdoi
10.1038/ncomms5715subject
Has Abstractpub_date
2014-09-02 00:00:00pages
4715issn
2041-1723pii
ncomms5715journal_volume
5pub_type
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