IL-8, GRO and MCP-1 produced by hepatocellular carcinoma microenvironment determine the migratory capacity of human bone marrow-derived mesenchymal stromal cells without affecting tumor aggressiveness
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Juan Bayo1, Alejandrina Real1, Esteban J. Fiore1, Mariana Malvicini1, Leonardo Sganga6, Marcela Bolontrade2, Oscar Andriani3, Carolina Bizama4, Cristóbal Fresno5, Osvaldo Podhajcer6, Elmer Fernandez5, Manuel Gidekel7,8, Guillermo D. Mazzolini1,3,*, Mariana G. García1,*
1Gene Therapy Laboratory, Instituto de Investigaciones en Medicina Traslacional, Facultad de Ciencias Biomédicas, CONICET, Universidad Austral, Buenos Aires, Argentina
2Stem Cells Laboratory, IBYME, CONICET, Buenos Aires, Argentina
3Liver Unit, Hospital Universitario Austral, Derqui-Pilar, Argentina
4Universidad Católica, Santiago, Chile
5BioScience Data Mining Group, Catholic University of Córdoba, Córdoba, Argentina
6Fundación Instituto Leloir, CONICET, Buenos Aires, Argentina
7Universidad de la Frontera, Temuco, Chile
8Universidad Autónoma de Chile, Santiago, Chile
*Both authors share credits for senior authorship
Guillermo D. Mazzolini, email: email@example.com
Mariana G. García, email: firstname.lastname@example.org
Keywords: human mesenchymal stromal cells, tumor microenvironment, IL-8, human hepatocellular carcinoma, migration
Received: October 29, 2015 Accepted: May 22, 2016 Published: June 25, 2016
New therapies are needed for advanced hepatocellular carcinoma (HCC) and the use of mesenchymal stromal cells (MSCs) carrying therapeutic genes is a promising strategy. HCC produce cytokines recruiting MSCs to the tumor milieu and modifying its biological properties. Our aim was to study changes generated on human MSCs exposed to conditioned media (CM) derived from human HCC fresh samples and xenografts. All CM shared similar cytokines expression pattern including CXCL1-2-3/GRO, CCL2/MCP-1 and CXCL8/IL-8 being the latter with the highest concentration. Neutralizing and knockdown experiments of CCL2/MCP-1, CXCL8/IL-8, CXCR1 and CXCR2 reduced in vitro MSC migration of ≥20%. Simultaneous CXCR1 and CXCR2 neutralization resulted in 50% of MSC migration inhibition. MSC stimulated with CM (sMSC) from HuH7 or HC-PT-5 showed a 2-fold increase of migration towards the CM compared with unstimulated MSC (usMSC). Gene expression profile of sMSC showed ~500 genes differentially expressed compared with usMSC, being 46 genes related with cell migration and invasion. sMSC increased fibroblasts and endothelial cells chemotaxis. Finally, sMSC with HuH7 CM and then inoculated in HCC tumor bearing-mice did not modify tumor growth. In this work we characterized factors produced by HCC responsible for the changes in MSC chemotactic capacity with would have an impact on therapeutic use of MSCs for human HCC.
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