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Differential programming of p53-deficient embryonic cells during rotenone block
M L Green1, A V Singh, L B Ruest
1Department of Molecular, Cellular and Craniofacial Biology, University of Louisville, 501 S. Preston St., Louisville, KY 40202, USA. maia.green@merck.com
Toxicology
|September 7, 2011
Summary
Mitochondrial dysfunction impacts cellular stress responses. The p53 pathway influences how cells react to chemical toxicity, with specific mRNA and microRNA networks playing a role in embryonic cells.
Area of Science:
- Biochemistry
- Cell Biology
- Toxicology
Background:
- Mitochondrial dysfunction is linked to chemical toxicities.
- The p53 protein is a key regulator in cellular responses to stress.
- NADH/NAD+ balance is crucial for cellular metabolism.
Purpose of the Study:
- To investigate differential metabolic pathway expression during cellular stress.
- To compare p53-efficient and p53-deficient embryonic fibroblasts.
- To explore the role of mRNA and microRNA networks in cellular response to mitochondrial dysfunction.
Main Methods:
- Utilized an in vitro model with p53-efficient and p53-deficient embryonic fibroblasts.
- Exposed cells to Rotenone, a complex I inhibitor.
- Performed genome-based analysis of mRNA and microRNA expression.
- Assessed changes in the cytoskeleton and NADH/NAD+ balance.
Main Results:
- Rotenone exposure inverted the NADH/NAD+ ratio in both cell lines.
- Cytoskeletal structure and tubulin gene expression were perturbed by Rotenone.
- Significant changes in mRNA and microRNA abundance were observed.
- Expression profiles indicated alterations in energy-utilizing pathways.
Conclusions:
- The p53 pathway modulates cellular responses to mitochondrial dysfunction.
- mRNA and microRNA networks are involved in controlling cellular responses.
- Embryonic cells exhibit specific regulatory mechanisms influenced by p53.
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