Aurora-A Mitotic Kinase Induces Endocrine Resistance through Down-Regulation of ERα Expression in Initially ERα+ Breast Cancer Cells

ECU Author/Contributor (non-ECU co-authors, if there are any, appear on document)

Antonino B. D'Assoro (Creator)

Amy Degnim (Creator)

Evanthia Galanis (Creator)

Mattew P. Goetz (Creator)

Tufia Haddad (Creator)

John Hawse (Creator)

James N. Ingle (Creator)

Carol Lange (Creator)

Gwen A. Lomberk (Creator)

James McCubrey (Creator)

Mateusz Opyrchal (Creator)

Jeffrey L. Salisbury (Creator)

Shuya Zhang (Creator)

Institution

East Carolina University (ECU )

Web Site: http://www.ecu.edu/lib/

Abstract: main article; Development of endocrine resistance during tumor progression represents a major challenge in the management of estrogen receptor alpha (ERa) positive breast tumors and is an area under intense investigation. Although the underlying mechanisms are still poorly understood, many studies point towards the ‘cross-talk’ between ERa and MAPK signaling pathways as a key oncogenic axis responsible for the development of estrogen-independent growth of breast cancer cells that are initially ERa+ and hormone sensitive. In this study we employed a metastatic breast cancer xenograft model harboring constitutive activation of Raf-1 oncogenic signaling to investigate the mechanistic linkage between aberrant MAPK activity and development of endocrine resistance through abrogation of the ERa signaling axis. We demonstrate for the first time the causal role of the Aurora-A mitotic kinase in the development of endocrine resistance through activation of SMAD5 nuclear signaling and down-regulation of ERa expression in initially ERa+ breast cancer cells. This contribution is highly significant for the treatment of endocrine refractory breast carcinomas, because it may lead to the development of novel molecular therapies targeting the Aurora-A/SMAD5 oncogenic axis. We postulate such therapy to result in the selective eradication of endocrine resistant ERalow/- cancer cells from the bulk tumor with consequent benefits for breast cancer patients.

Additional Information

Publication

Other

PLoS ONE; 9:5 p. 1-7

Language: English

Date: 2014

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