MDA-7 results in downregulation of AKT concomitant with apoptosis and cell cycle arrest in breast cancer cells View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2011-07

AUTHORS

V Valero, H Wingate, S Chada, Y Liu, F Palalon, G Mills, K Keyomarsi, K K Hunt

ABSTRACT

The melanoma differentiation-associated gene-7 (mda-7) is a known mediator of apoptosis in cancer cells but not in normal cells. We hypothesized that MDA-7 interferes with the prosurvival signaling pathways that are commonly altered in cancer cells to induce growth arrest and apoptosis. We also identified the cell signaling pathways that are antagonized by MDA-7 leading to apoptosis. Using an adenoviral expression system, mda-7 was introduced into the breast cancer cell lines SKBr3, MCF-7 and MDA-MB-468, each with a different estrogen receptor (ER) and HER-2 receptor status. Downstream targets of MDA-7 were assessed by reverse phase protein array analysis, western blot analysis and immunofluorescence confocal microscopy. Our results show that MDA-7-induced apoptosis was mediated by caspases in all cell lines tested. However, MDA-7 modulates additional pathways in SKBr3 (HER-2 positive) and MCF-7 (ER positive) cells including downregulation of AKT-GSK3β and upregulation of cyclin-dependent kinase inhibitors in the nucleus. This leads to cell cycle arrest in addition to apoptosis. In conclusion, MDA-7 abrogates tumor-promoting pathways including the activation of caspase-dependent signaling pathways ultimately leading to apoptosis. In addition, depending on the phenotype of the breast cancer cell, MDA-7 modulates cell cycle regulating pathways to mediate cell cycle arrest. More... »

PAGES

510

Identifiers

URI

http://scigraph.springernature.com/pub.10.1038/cgt.2011.20

DOI

http://dx.doi.org/10.1038/cgt.2011.20

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1050405040

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/21546925


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