1. SETDB2 promoted breast cancer stem cell maintenance by interaction with and stabilization of ΔNp63α protein.
- Author
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Ying L, Fei X, Jialun L, Jianpeng X, Jie W, Zhaolin M, Hongjia F, Huan F, Sha L, Qiuju W, Lin Y, Cuicui L, You P, Weiwei Z, Lulu W, Jiemin W, Jing L, and Jing F
- Subjects
- Cell Line, Tumor, Cycloheximide pharmacology, Female, Gene Expression Regulation, Neoplastic drug effects, Gene Expression Regulation, Neoplastic physiology, Hedgehog Proteins genetics, Hedgehog Proteins metabolism, Histone-Lysine N-Methyltransferase genetics, Humans, Leupeptins pharmacology, Neoplastic Stem Cells drug effects, Transcription Factors genetics, Tumor Suppressor Proteins genetics, Breast Neoplasms metabolism, Histone-Lysine N-Methyltransferase metabolism, Neoplastic Stem Cells metabolism, Transcription Factors metabolism, Tumor Suppressor Proteins metabolism
- Abstract
The histone H3K9 methyltransferase SETDB2 is involved in cell cycle dysregulation in acute leukemia and has oncogenic roles in gastric cancer. In our study, we found that SETDB2 plays essential roles in breast cancer stem cell maintenance. Depleted SETDB2 significantly decreased the breast cancer stem cell population and mammosphere formation in vitro and also inhibited breast tumor initiation and growth in vivo . Restoring SETDB2 expression rescued the defect in breast cancer stem cell maintenance. A mechanistic analysis showed that SETDB2 upregulated the transcription of the ΔNp63α downstream Hedgehog pathway gene. SETDB2 also interacted with and methylated ΔNp63α, and stabilized ΔNp63α protein. Restoring ΔNp63α expression rescued the breast cancer stem cell maintenance defect which mediated by SETDB2 knockdown. In conclusion, our study reveals a novel function of SETDB2 in cancer stem cell maintenance in breast cancer., Competing Interests: Competing Interests: The authors have declared that no competing interest exists., (© The author(s).)
- Published
- 2020
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