ArticleMolecular biology of the cell2025
TGFβ1-TNFα-regulated secretion of neutrophil chemokines is independent of epithelial-mesenchymal transition in breast tumor cells.
Article in Molecular biology of the cell, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Neutrophils exert tumor-promoting roles in breast cancer and are particularly prominent in aggressive breast tumors. The proinflammatory signals TGF-β1 and TNF-α are upregulated in breast tumors and induce epithelial-to-mesenchymal transitions (EMT), a process linked to cancer cell aggressiveness. Here, we investigated the roles of TGF-β1 and TNF-α in the recruitment of neutrophils by breast cancer cells. Dual-treatment with TGF-β1 and TNF-α induces EMT signatures in premalignant M2 cells, which are part of the MCF10A breast cancer progression model. Conditioned media (CM) harvested from M2 cells treated with TGF-β1/TNF-α gives rise to amplified neutrophil chemotaxis compared with CM from vehicle-treated M2 cells. This response correlates with higher levels of the neutrophil chemokines CXCL1 and CXCL8, in a p38MAPK-dependent manner, and is attenuated by CXCL8-neutralizing antibodies. We combined gene editing, immunological, and biochemical assays to show that neutrophil recruitment and EMT are uncoupled in treated M2 cells. Finally, analysis of transcriptomic databases of cancer cell lines revealed a significant correlation between CXCL8 and TGF-β1/TNF-α-regulated or effector genes in breast cancer. These findings establish a novel role for the TGF-β1/TNF-α/p38 MAPK signaling axis in regulating neutrophil recruitment in breast cancer, independent of their profound impact on EMT.
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