1. An epigenetic increase in mitochondrial fission by MiD49 and MiD51 regulates the cell cycle in cancer: Diagnostic and therapeutic implications.
- Author
-
Dasgupta A, Chen KH, Wu D, Hoskin V, Mewburn J, Lima PDA, Parlow LRG, Hindmarch CCT, Martin A, Sykes EA, Tayade C, Lightbody ED, Madarnas Y, SenGupta SK, Elliott BE, Nicol CJB, and Archer SL
- Subjects
- Animals, Apoptosis, Biomarkers, Tumor genetics, Carcinoma, Non-Small-Cell Lung genetics, Carcinoma, Non-Small-Cell Lung metabolism, Carcinoma, Non-Small-Cell Lung therapy, Cell Proliferation, Female, Gene Expression Regulation, Neoplastic, Humans, Lung Neoplasms genetics, Lung Neoplasms metabolism, Lung Neoplasms therapy, Male, Mice, Mice, Inbred BALB C, Mice, Nude, Middle Aged, Mitochondrial Dynamics, Mitochondrial Proteins antagonists & inhibitors, Mitochondrial Proteins genetics, Peptide Elongation Factors antagonists & inhibitors, Peptide Elongation Factors genetics, Prognosis, Survival Rate, Tumor Cells, Cultured, Xenograft Model Antitumor Assays, Biomarkers, Tumor metabolism, Carcinoma, Non-Small-Cell Lung pathology, Cell Cycle, Epigenesis, Genetic, Lung Neoplasms pathology, Mitochondrial Proteins metabolism, Peptide Elongation Factors metabolism
- Abstract
Excessive proliferation and apoptosis-resistance are hallmarks of cancer. Increased dynamin-related protein 1 (Drp1)-mediated mitochondrial fission is one of the mediators of this phenotype. Mitochondrial fission that accompanies the nuclear division is called mitotic fission and occurs when activated Drp1 binds partner proteins on the outer mitochondrial membrane. We examine the role of Drp1-binding partners, mitochondrial dynamics protein of 49 and 51 kDa (MiD49 and MiD51), as drivers of cell proliferation and apoptosis-resistance in non-small cell lung cancer (NSCLC) and invasive breast carcinoma (IBC). We also evaluate whether inhibiting MiDs can be therapeutically exploited to regress cancer. We show that MiD levels are pathologically elevated in NSCLC and IBC by an epigenetic mechanism (decreased microRNA-34a-3p expression). MiDs silencing causes cell cycle arrest through (a) increased expression of cell cycle inhibitors, p27
Kip1 and p21Waf1 , (b) inhibition of Drp1, and (c) inhibition of the Akt-mTOR-p70S6K pathway. Silencing MiDs leads to mitochondrial fusion, cell cycle arrest, increased apoptosis, and tumor regression in a xenotransplant NSCLC model. There are positive correlations between MiD expression and tumor size and grade in breast cancer patients and inverse correlations with survival in NSCLC patients. The microRNA-34a-3p-MiDs axis is important to cancer pathogenesis and constitutes a new therapeutic target., (© 2020 Federation of American Societies for Experimental Biology.)- Published
- 2020
- Full Text
- View/download PDF