Journal
FEBS JOURNAL
Volume 287, Issue 22, Pages 4862-4880Publisher
WILEY
DOI: 10.1111/febs.15289
Keywords
breast cancer; integrins; invadopodia; lumican; proteoglycans
Categories
Funding
- Region Champagne-Ardenne
- Fond Europeen de Developpement Regional (FEDER)
- Ligue contre le cancer
- PHC Polonium
- Eiffel Scholarship of Excellence from the French Ministry of Foreign Affairs [870731F]
- General Secretariat for Research and Technology (GSRT)
- Hellenic Foundation for Research and Innovation (HFRI)
- le Contrat de Projet Etat Region CPER 2013-2020
- Conference de Coordination Inter Regionale du Grand Est (CCIR-GE) [30036506UMR7369]
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The small leucine-rich proteoglycan lumican regulates estrogen receptors (ERs)-associated functional properties of breast cancer cells, expression of matrix macromolecules, and epithelial-to-mesenchymal transition. However, it is not known whether the ER-dependent lumican effects on breast cancer cells are related to the expression of integrins and their intracellular signaling pathways. Here, we analyzed the effects of lumican in three breast cancer cell lines: the highly metastatic ER beta-positive MDA-MB-231, cells with the respective ER beta-suppressed (shER beta MDA-MB-231), and lowly invasive ER alpha-positive MCF-7/c breast cancer cells. Scanning electron microscopy, confocal microscopy, real-time PCR, western blot, and cell adhesion assays were performed. Lumican effects on breast cancer cell morphology were also investigated in 3-dimensional collagen cultures. Lumican treatment induced cell-cell contacts and cell grouping and inhibited microvesicles and microvilli formation. The expression of the cell surface adhesion receptor CD44, its isoform and variants, hyaluronan (HA), and HA synthases was also investigated. Lumican inhibited the expression of CD44 and HA synthases, and its effect on cell adhesion revealed a major role of alpha 1, alpha 2, alpha 3, alpha V beta 3, and alpha V beta 5 integrins in MDA-MB-231 cells, but not in MCF-7/c cells. Lumican upregulated the expression of alpha 2 and beta 1 integrin subunits both in MDA-MB-231 and in shER beta MDA-MB-231 as compared to MCF-7/c cells. Downstream signaling pathways for integrins, such as FAK, ERK 1/2 MAPK 42/44, and Akt, were found to be downregulated by lumican. Our data shed light to the molecular mechanisms responsible for the anticancer activity of lumican in invasive breast cancer.
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