6533b820fe1ef96bd12791bb
RESEARCH PRODUCT
Mesenchymal Transition of High-Grade Breast Carcinomas Depends on Extracellular Matrix Control of Myeloid Suppressor Cell Activity
Rosaria OrlandiMario P. ColomboClaudia ChiodoniMariella ParenzaSabina SangalettiBarbara CappettiClaudio TripodoNadia CastioniPaola PortararoElda TagliabueAlessandra SantangeloLaura BottiAlessandro Gulinosubject
0301 basic medicineMyeloidMDSCGene Expressionmedicine.disease_causeT-Lymphocytes RegulatoryPolyethylene GlycolsExtracellular matrixMiceBreast cancerMyeloid CellsOsteonectinMast Cellslcsh:QH301-705.5Mice KnockoutAntigen PresentationMice Inbred BALB CEMTepithelial to mesenchymal transitionBreast cancer; COX-2; CXCL12; ECM; EMT; G-CSF; GM-CSF; MDSC; SPARC; aminobisphosphonates; cyclooxygenase-2; epithelial to mesenchymal transition; extracellular matrix; granulocyte colony-stimulating factor; granulocyte-macrophage colony-stimulating factor; myeloid-derived suppressor cellsCXCL12Granulocyte macrophage colony-stimulating factormedicine.anatomical_structurecyclooxygenase-2granulocyte-macrophage colony-stimulating factorFemalegranulocyte colony-stimulating factormedicine.drugEpithelial-Mesenchymal Transitionextracellular matrixAntineoplastic AgentsBreast NeoplasmsBiologySettore MED/08 - Anatomia PatologicaG-CSFGeneral Biochemistry Genetics and Molecular Biology03 medical and health sciencesCell Line TumormedicineAnimalsHumansEpithelial–mesenchymal transitionECMMesenchymal stem cellSPARCGM-CSFCOX-2myeloid-derived suppressor cellsXenograft Model Antitumor AssaysIsogenic human disease modelsaminobisphosphonates030104 developmental biologylcsh:Biology (General)CelecoxibDoxorubicinImmunologyCancer researchMyeloid-derived Suppressor CellaminobisphosphonateNeoplasm GradingCarcinogenesisdescription
SummaryThe extracellular matrix (ECM) contributes to the biological and clinical heterogeneity of breast cancer, and different prognostic groups can be identified according to specific ECM signatures. In high-grade, but not low-grade, tumors, an ECM signature characterized by high SPARC expression (ECM3) identifies tumors with increased epithelial-to-mesenchymal transition (EMT), reduced treatment response, and poor prognosis. To better understand how this ECM3 signature is contributing to tumorigenesis, we expressed SPARC in isogenic cell lines and found that SPARC overexpression in tumor cells reduces their growth rate and induces EMT. SPARC expression also results in the formation of a highly immunosuppressive microenvironment, composed by infiltrating T regulatory cells, mast cells, and myeloid-derived suppressor cells (MDSCs). The ability of SPARC to induce EMT depended on the localization and suppressive function of myeloid cells, and inhibition of the suppressive function MDSCs by administration of aminobisphosphonates could revert EMT, rendering SPARC-overexpressing tumor cells sensitive to Doxil. We conclude that that SPARC is regulating the interplay between MDSCs and the ECM to drive the induction of EMT in tumor cells.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2016-09-01 | Cell Reports |