Abstract
Conditional overexpression of histone reader Tripartite motif containing protein 24 (TRIM24) in mouse mammary epithelia (Trim24COE) drives spontaneous development of mammary carcinosarcoma tumors, lacking ER, PR and HER2. Human carcinosarcomas or metaplastic breast cancers (MpBC) are a rare, chemorefractory subclass of triple-negative breast cancers (TNBC). Comparison of Trim24COE metaplastic carcinosarcoma morphology, TRIM24 protein levels and a derived Trim24COE gene signature reveals strong correlation with human MpBC tumors and MpBC patient-derived xenograft (PDX) models. Global and single-cell tumor profiling reveal Met as a direct oncogenic target of TRIM24, leading to aberrant PI3K/mTOR activation. Here, we find that pharmacological inhibition of these pathways in primary Trim24COE tumor cells and TRIM24-PROTAC treatment of MpBC TNBC PDX tumorspheres decreased cellular viability, suggesting potential in therapeutically targeting TRIM24 and its regulated pathways in TRIM24-expressing TNBC.
© 2021. The Author(s).
Publication types
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Research Support, N.I.H., Extramural
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Research Support, Non-U.S. Gov't
MeSH terms
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Animals
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Breast / pathology
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Carcinosarcoma / genetics*
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Carcinosarcoma / pathology
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Carrier Proteins / genetics*
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Carrier Proteins / metabolism
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Clinical Trials as Topic
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Female
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Gene Expression Regulation, Neoplastic
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Humans
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Mammary Glands, Animal / pathology
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Mammary Neoplasms, Experimental / genetics*
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Mammary Neoplasms, Experimental / pathology
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Mice
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Mice, Transgenic
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Nuclear Proteins / genetics*
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Nuclear Proteins / metabolism
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Primary Cell Culture
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Proto-Oncogene Proteins c-met / genetics
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RNA-Seq
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Single-Cell Analysis
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Transcription Factors / genetics*
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Transcription Factors / metabolism
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Triple Negative Breast Neoplasms / genetics*
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Triple Negative Breast Neoplasms / pathology
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Whole Genome Sequencing
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Xenograft Model Antitumor Assays
Substances
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Carrier Proteins
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Nuclear Proteins
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TRIM24 protein, human
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Transcription Factors
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transcriptional intermediary factor 1
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HGFR protein, mouse
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MET protein, human
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Proto-Oncogene Proteins c-met
Associated data
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figshare/10.6084/m9.figshare.14818542.v1
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figshare/10.6084/m9.figshare.14818560.v1
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figshare/10.6084/m9.figshare.14818536.v1
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figshare/10.6084/m9.figshare.14818575.v1