Abstract
As a proapoptotic death effect domain (DED)-containing protein, DED-containing DNA-binding protein (DEDD) has been demonstrated to inhibit tumor growth, invasion and metastasis in our previous studies. Here, we demonstrated that knockdown of DEDD in MCF-7 cells resulted in characteristic drug resistance to doxorubicin and paclitaxel, and overexpression of DEDD in MDA-MB-231 cells increased their sensitivity to doxorubicin and paclitaxel. The expression levels of DEDD were positively correlated with Bcl-2 in breast cancer cell lines as well as in human breast cancer tissue. Knockdown of DEDD downregulated the transcriptional activity of the bcl-2 gene and shortened the time for Bcl-2 degradation. DEDD interacts with and stabilizes Bcl-2, and breast cancer cells with low DEDD expression were more sensitive to treatment with a BH3 mimetic, ABT-199, than were those with high DEDD expression. In total, our findings highlight a new strategy for treating breast cancer with no/low DEDD expression by targeting Bcl-2 with the BH3 mimetic ABT-199.
Keywords:
ABT-199; Bcl-2; Breast cancer; DEDD; Drug resistance.
Copyright © 2020 Elsevier Inc. All rights reserved.
Publication types
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Research Support, Non-U.S. Gov't
MeSH terms
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Breast Neoplasms / drug therapy
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Breast Neoplasms / pathology*
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Bridged Bicyclo Compounds, Heterocyclic / pharmacology*
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Bridged Bicyclo Compounds, Heterocyclic / therapeutic use
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DNA-Binding Proteins / genetics
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DNA-Binding Proteins / metabolism*
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Death Domain Receptor Signaling Adaptor Proteins / genetics
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Death Domain Receptor Signaling Adaptor Proteins / metabolism*
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Doxorubicin / pharmacology
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Doxorubicin / therapeutic use
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Drug Resistance, Neoplasm / drug effects
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Female
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Gene Expression Regulation, Neoplastic / drug effects
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Gene Knockdown Techniques
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Humans
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MCF-7 Cells
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Paclitaxel / pharmacology
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Paclitaxel / therapeutic use
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Proto-Oncogene Proteins c-bcl-2 / antagonists & inhibitors*
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Proto-Oncogene Proteins c-bcl-2 / genetics
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Proto-Oncogene Proteins c-bcl-2 / metabolism
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RNA, Messenger / genetics
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RNA, Messenger / metabolism
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Sulfonamides / pharmacology*
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Sulfonamides / therapeutic use
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Transcription, Genetic / drug effects
Substances
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Bridged Bicyclo Compounds, Heterocyclic
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DEDD protein, human
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DNA-Binding Proteins
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Death Domain Receptor Signaling Adaptor Proteins
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Proto-Oncogene Proteins c-bcl-2
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RNA, Messenger
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Sulfonamides
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Doxorubicin
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venetoclax
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Paclitaxel