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CCL2 conditionally determines CCL22-dependent Th2-accumulation during TGF-β-induced breast cancer progression
P K MANDAL, S BISWAS, G MANDAL, S PUROHIT, A GUPTA, (GIRI) A MAJUMDAR, CHOWDHURY S ROY,
Published in Elsevier GmbH
2018
PMID: 29107385
Volume: 223
   
Issue: 2
Pages: 151 - 161
Abstract
We investigated expressions of −CC chemokine ligand 2 (CCL2) and CCL5 in tumor samples from 147 breast cancer (BCa) patients and correlated with transforming growth factor-β (TGF-β) expression. We observed an inverse correlation of TGF-β expression with CCL2, CCL5 expression in early stages of BCa. On contrary, in late stages, CCL2, not CCL5, expression was found to be directly proportional with TGF-β expression. TGF-β stimulated MDA-MB-231 cells to express CCL2, however, downregulated both CCL2 and CCL5 in MCF-7. Interestingly, a significant swing of Th1-Th2 ratio towards Th2 is seen within the primary tumors expressing moderate/high-CCL2-low/negative-CCL5. We observed that CCL2-CCR2 interaction induces monocytes/macrophages to secrete Th2-attracting chemokine CCL22 in vitro. Therefore, CCL2 secreted from the tumor microenvironment may attract and interact with monocytes/macrophages, and favor Th2 accumulation by inducing CCL22 secretion. Study in 4T1-BALB/c BCa mouse model demonstrated significant (p < 0.05) decrease in CCL2, CCL5 and CCL22 levels and reduction in lung metastatic nodule numbers upon administering TGF-β inhibitor. These findings collectively indicate that TGF-β regulates CCL2 and CCL5 expression in a stage-dependent manner during BCa progression, which in turn, determines Th1-Th2 balance within the tumor microenvironment. © 2017 Elsevier GmbH
About the journal
JournalData powered by TypesetImmunobiology
PublisherData powered by TypesetElsevier GmbH
ISSN0171-2985
Open AccessNo