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Nueda ML, Naranjo AI, Baladrón V, Laborda J. Different expression levels of DLK1 inversely modulate the oncogenic potential of human MDA-MB-231 breast cancer cells through inhibition of NOTCH1 signaling. FASEB J 2017; 31:3484-3496. [PMID: 28461338 DOI: 10.1096/fj.201601341rrr] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2016] [Accepted: 04/11/2017] [Indexed: 01/01/2023]
Abstract
NOTCH receptors participate in cancer cell proliferation and survival. Accumulated evidence indicates that, depending on the cellular context, these receptors can function as oncogenes or as tumor-suppressor genes. The epidermal growth factor-like protein delta-like homolog (DLK)1 acts as a NOTCH inhibitor and is involved in the regulation of normal and tumoral growth. In this work, we focused on the role of DLK1 in the control of breast cancer cell growth, a tumor type in which NOTCH receptors have been shown to play both opposite roles. We found that human DLK1 inhibits NOTCH signaling in MDA-MB-231 breast cancer cells. The proliferation rate and invasion capabilities of these cells depended on the level of NOTCH activation and signaling, as regulated by DLK1. High levels of DLK1 expression led to a significant decrease in NOTCH signaling, which was associated with a decrease in breast cancer cell proliferation and invasion. On the contrary, lower levels of NOTCH inhibition, caused by lower levels of DLK1 overexpression, led to enhanced in vitro MDA-MB-231 cell invasion, and to both in vitro and in vivo increased cell proliferation. The data presented in this work suggest that a fine regulation of NOTCH signaling plays an important role in the control of breast cancer cell proliferation and invasion.-Nueda, M.-L., Naranjo, A.-I., Baladrón V., Laborda, J. Different expression levels of DLK1 inversely modulate the oncogenic potential of human MDA-MB-231 breast cancer cells through inhibition of NOTCH1 signaling.
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Affiliation(s)
- María-Luisa Nueda
- Biochemistry and Molecular Biology Branch-Department of Inorganic and Organic Chemistry and Biochemistry, University of Castilla-La Mancha, Spanish National Research Council (CSIC), Albacete, Spain .,School of Pharmacy, University of Castilla-La Mancha, Spanish National Research Council (CSIC), Albacete, Spain
| | - Ana-Isabel Naranjo
- Biochemistry and Molecular Biology Branch-Department of Inorganic and Organic Chemistry and Biochemistry, University of Castilla-La Mancha, Spanish National Research Council (CSIC), Albacete, Spain.,School of Medicine, University of Castilla-La Mancha, Spanish National Research Council (CSIC), Albacete, Spain and.,Regional Center for Biomedical Research (CRIB)-Biomedicine Unit, University of Castilla-La Mancha, Spanish National Research Council (CSIC), Albacete, Spain
| | - Victoriano Baladrón
- Biochemistry and Molecular Biology Branch-Department of Inorganic and Organic Chemistry and Biochemistry, University of Castilla-La Mancha, Spanish National Research Council (CSIC), Albacete, Spain.,School of Medicine, University of Castilla-La Mancha, Spanish National Research Council (CSIC), Albacete, Spain and.,Regional Center for Biomedical Research (CRIB)-Biomedicine Unit, University of Castilla-La Mancha, Spanish National Research Council (CSIC), Albacete, Spain
| | - Jorge Laborda
- Biochemistry and Molecular Biology Branch-Department of Inorganic and Organic Chemistry and Biochemistry, University of Castilla-La Mancha, Spanish National Research Council (CSIC), Albacete, Spain .,School of Pharmacy, University of Castilla-La Mancha, Spanish National Research Council (CSIC), Albacete, Spain
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