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Published in: Clinical & Experimental Metastasis 8/2014

01-12-2014

Placenta-breast cancer cell interactions promote cancer cell epithelial mesenchymal transition via TGFβ/JNK pathway

Authors: Gali Epstein Shochet, Shelly Tartakover-Matalon, Liat Drucker, Metsada Pasmanik-Chor, Meir Pomeranz, Ami Fishman, Michael Lishner

Published in: Clinical & Experimental Metastasis | Issue 8/2014

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Abstract

Women diagnosed with pregnancy associated breast cancer often have advanced cancer with metastases and reduced expression of ERα compared to non-pregnant women. Nevertheless, metastases to the placenta are uncommon. Previously, we demonstrated that breast cancer cells (MCF-7/T47D) migrated from ex vivo human placental explant implantation sites. We aimed to analyze the effect of factors produced during placental implantation or as a result of the interaction between the implanted placentae to cancer cells on cancer cells migration and aggressiveness. We collected supernatants from implanted placentae and placental-breast cancer cells cocultures and analyzed their effects on cancer cells phenotype and pathways. Supernatants collected from breast cancer cells served as controls. We found that supernatants collected from implanted placentae induced modest cancer cells migration that was not accompanied by epithelial to mesenchymal transition (EMT), supported breast cancer cells survival and elevated MCF-7 cell number. The coculture supernatant induced excessive motility and EMT of the MCF-7 cells. This EMT was mediated by Smad3 and JNK/ERK activation. Both placenta and coculture supernatants reduced ERα expression in the cancer cells. Finally, we showed that MCF-7 cocultured with the human placental explants underwent continuous activation of JNK and Smad3 pathways and the EMT process, which led to their migration away from the placental implantation sites. These findings may explain the reduced ERα and elevated metastases found in breast cancer during pregnancy and highlights pathways involved in it.
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Metadata
Title
Placenta-breast cancer cell interactions promote cancer cell epithelial mesenchymal transition via TGFβ/JNK pathway
Authors
Gali Epstein Shochet
Shelly Tartakover-Matalon
Liat Drucker
Metsada Pasmanik-Chor
Meir Pomeranz
Ami Fishman
Michael Lishner
Publication date
01-12-2014
Publisher
Springer Netherlands
Published in
Clinical & Experimental Metastasis / Issue 8/2014
Print ISSN: 0262-0898
Electronic ISSN: 1573-7276
DOI
https://doi.org/10.1007/s10585-014-9683-0

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