title: Sequential serum-dependent activation of CREB and NRF-1 leads to enhanced mitochondrial respiration through the induction of cytochrome c.
abstract: Progression through the cell cycle requires ATP for protein synthesis, cytoskeletal rearrangement, chromatin remodeling, and protein degradation. The mechanisms by which mammalian cells increase respiratory capacity and ATP production in preparation for cell division are largely unexplored. Here, we demonstrate that serum induction of cytochrome c mRNA and processed protein in quiescent BALB/3T3 fibroblasts is associated with a marked increase in mitochondrial respiration. Cytochrome c was induced in the absence of any increase in citrate synthase activity or in subunit IV of the cytochrome c oxidase complex mRNA or protein, indicating that the enhanced respiratory rate did not require a general increase in mitochondrial biogenesis or respiratory chain expression. Transfections with a series of cytochrome c promoter mutants showed that both nuclear respiratory factor 1 (NRF-1) and cAMP-response element-binding protein (CREB) binding sites contributed equally to induced expression by serum. Moreover, CREB and NRF-1 were phosphorylated sequentially in response to serum, and the NRF-1 phosphorylation was accompanied by an increase in its ability to trans-activate target gene expression. The results demonstrate that the differential transcriptional expression of cytochrome c, through sequential transcription factor phosphorylations, leads to enhanced mitochondrial respiratory capacity upon serum-induced entry to the cell cycle.
authors.affiliation: Department of Cell and Molecular Biology, Northwestern Medical School, Chicago, Illinois 60611, USA.
authors.forename: R P
authors.initials: RP
authors.lastname: Herzig
authors.forename: S
authors.initials: S
authors.lastname: Scacco
authors.forename: R C
authors.initials: RC
authors.lastname: Scarpulla
mesh_terms: D016475:3T3 Cells; D000818:Animals; D001769:Blood; D002453:Cell Cycle; D019069:Cell Respiration; D017362:Cyclic AMP Response Element-Binding Protein / Q000235:genetics / Q000378:metabolism*; D003574:Cytochrome c Group / Q000378:metabolism*; D004268:DNA-Binding Proteins / Q000235:genetics / Q000378:metabolism*; D003576:Electron Transport Complex IV / Q000378:metabolism; D004789:Enzyme Activation; D015151:Immunoblotting; D008156:Luciferases / Q000378:metabolism; D051379:Mice; D008807:Mice, Inbred BALB C; D008928:Mitochondria / Q000378:metabolism*; D008954:Models, Biological; D051265:NF-E2-Related Factor 1; D051266:Nuclear Respiratory Factor 1; D051264:Nuclear Respiratory Factors; D010766:Phosphorylation; D010957:Plasmids; D011401:Promoter Regions, Genetic; D013053:Spectrophotometry; D013997:Time Factors; D015534:Trans-Activators / Q000235:genetics / Q000378:metabolism*; D014158:Transcription, Genetic; D014162:Transfection; D001616:beta-Galactosidase
chemical_list: D017362:Cyclic AMP Response Element-Binding Protein; D003574:Cytochrome c Group; D004268:DNA-Binding Proteins; D051265:NF-E2-Related Factor 1; C495634:Nrf1 protein, mouse; D051266:Nuclear Respiratory Factor 1; D051264:Nuclear Respiratory Factors; D015534:Trans-Activators; D008156:Luciferases; D003576:Electron Transport Complex IV; D001616:beta-Galactosidase