Abstract:
BACKGROUND:Minimal residual disease is the main issue of advanced ovarian cancer treatment. According to the literature and previous results, we hypothesized that Mesenchymal Stromal Cells (MSC) could support this minimal residual disease by protecting ovarian cancer cells (OCC) from chemotherapy. In vitro study confirmed that MSC could induce OCC chemoresistance without contact using transwell setting. Further experiments showed that this induced chemoresistance was dependent on IL-6 OCC stimulation. METHODS:We combined meticulous in vitro profiling and tumor xenograft models to study the role of IL-6 in MSC/OCC intereactions. RESULTS:We demonstrated that Tocilizumab® (anti-IL-6R therapy) in association with chemotherapy significantly reduced the peritoneal carcinosis index (PCI) than chemotherapy alone in mice xenografted with OCCs+MSCs. Further experiments showed that CCL2 and CCL5 are released by MSC in transwell co-culture and induce OCCs IL-6 secretion and chemoresistance. Finally, we found that IL-6 induced chemoresistance was dependent on PYK2 phosphorylation. CONCLUSIONS:These findings highlight the potential key role of the stroma in protecting minimal residual disease from chemotherapy, thus favoring recurrences. Future clinical trials targeting stroma could use anti-IL-6 therapy in association with chemotherapy.
journal_name
Mol Cancerjournal_title
Molecular cancerauthors
Pasquier J,Gosset M,Geyl C,Hoarau-Véchot J,Chevrot A,Pocard M,Mirshahi M,Lis R,Rafii A,Touboul Cdoi
10.1186/s12943-018-0787-zsubject
Has Abstractpub_date
2018-02-19 00:00:00pages
47issue
1issn
1476-4598pii
10.1186/s12943-018-0787-zjournal_volume
17pub_type
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