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Common and cell type-specific responses of human cells to mitochondrial dysfunction
Michael V Miceli1, S Michal Jazwinski
1Department of Biochemistry and Molecular Biology, Louisiana State University Health Sciences Center, New Orleans, LA 70112, USA. mmicel@lsuhsc.edu
Experimental Cell Research
|November 25, 2004
Summary
Mitochondrial dysfunction in human cells triggers specific gene expression changes, including increased glycolysis and stress responses. These alterations are crucial for cellular adaptation and may explain tissue responses in aging and disease.
Area of Science:
- Cellular Biology
- Genetics
- Biochemistry
Background:
- Mitochondrial dysfunction impacts cellular function and gene expression.
- Retrograde regulation in yeast alters nuclear gene expression and lifespan.
- Nuclear gene responses to mitochondrial loss in mammalian cells are not well understood.
Purpose of the Study:
- To characterize nuclear gene expression changes in response to mitochondrial DNA loss in human cells.
- To identify common and cell-type-specific gene expression alterations.
- To investigate the role of MYC in glycolysis regulation.
Main Methods:
- Quantitative real-time reverse transcriptase-polymerase chain reaction (RT-PCR) was used.
- Gene expression was analyzed in T143B, ARPE19, and GMO6225 human cell lines.
- RNA interference was employed to study MYC function.
Main Results:
- Common gene expression changes across cell types included up-regulation of GCK, CS, HOX1, CKMT2, MYC, and WRN, and down-regulation of FBP1 and COL4A1.
- MYC induction was found to be essential for glycolysis up-regulation in rho0 cells.
- Cell type-specific gene expression changes were observed, correlating with cell differentiation.
Conclusions:
- Mitochondrial dysfunction induces conserved and specific nuclear gene expression responses in human cells.
- These changes, particularly MYC-driven glycolysis up-regulation, are key adaptive mechanisms.
- Understanding these responses can shed light on tissue-level adaptations in aging and disease states.