TNFα-exposed bone marrow-derived mesenchymal stem cells promote locomotion of MDA-MB-231 breast cancer cells through transcriptional activation of CXCR3 ligand chemokines.

The Journal of Biological Chemistry
Soon Young ShinYoung Han Lee

Abstract

Bone marrow-derived mesenchymal stem cells (BM-MSCs) are often recruited to solid tumors, integrate into the tumor stroma, and contribute to tumor development. TNFα is a major inflammatory cytokine present in the tumor microenvironment and has a profound influence on the progression of tumor development. This study was aimed to investigate the role of BM-MSCs in tumor promotion in response to TNFα. Quantitative real-time PCR arrays show that diverse cytokines/chemokines were induced in TNFα-treated BM-MSCs; in particular, CXCR3 ligand chemokines, including CXCL9, CXCL10, and CXCL11, were potently induced. A serial and site-directed mutation analysis in the CXCL9, CXCL10, and CXCL11 promoters revealed that NF-κB binding elements were responsible for TNFα-induced promoter activation of CXCR3 ligand chemokines. TNFα stimulated NF-κB activity, and ectopic expression of NF-κB enhanced TNFα-induced promoter activities of the CXCR3 ligand chemokines. Gel shift and supershift assays showed that NF-κB was associated with CXCR3 ligand chemokine promoters in response to TNFα treatment. All three CXCR3 ligand chemokines enhanced the migration and invasive motility of MDA-MB-231 breast cancer cells expressing CXCR3. Treatment of MDA-MB-231 ...Continue Reading

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