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Breast cancer metabolic cross-talk: Fibroblasts are hubs and breast cancer cells are gatherers of lipids.
Molecular and Cellular Endocrinology 2018 Februrary 16
The cellular components of microenvironment are partners of cancer cells, sharing soluble factors and organic molecules to accomplish tumor energy and biomass demands. We tested the role of fibroblasts in fatty acids metabolism in breast cancer, addressing fatty acid synthase (FASN) expression and activity, the expression of lipids chaperons (FABPs) and transporters (FATPs) and lipids cellular content. We showed that the amount of lipids increased in cancer cells exposed to fibroblasts conditioned media, showing that lipids transfer is crucial in this metabolic cross-talk. Accordingly, it was seen in those cancer cells a concomitant decrease in the expression of FABP2 and FABP3 and an increase in FATP1 expression, whose function is independent of FABPs. The in vivo experiment corroborates the role of CAFs in tumor growth. Our study is one more step toward the understanding of metabolic dynamics between cancer cells and CAFs, disclosing FATP1 as a putative target to disturb the transfer of lipids between CAFs and breast cancer cells.
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