期刊
BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH
卷 1843, 期 4, 页码 675-684出版社
ELSEVIER
DOI: 10.1016/j.bbamcr.2013.12.017
关键词
Mitochondria; PKA; CREB; PGC-l alpha; Quiescent fibroblasts; Hydroxytyrosol
资金
- Strategic Project Regione Puglia [POR CIP PS_101]
- FIRB Project
- Future in Research, Ministero dell'Istruzione, Universita' e della Ricerca (MIUR)
A study is presented on the expression of mitochondria] oxidative phosphorylation complexes in exponentially growing and serum-starved, quiescent human fibroblast cultures. The functional levels of respiratory complexes land ill and complex V (adenosine triphosphate (ATP) synthase) were found to be severely depressed in serum-starved fibroblasts. The depression of oxidative phosphorylation system (OXPHOS) complexes was associated with reduced levels of peroxisome proliferator-activated receptor gamma coactivator 1-alpha (PGC-1 alpha) and the down-stream nuclear respiratory factor 1 (NRF1) and mitochondrial transcription factors (TFAM). In serum-starved fibroblasts decrease of the catalytic activity of AMP cyclic dependent protein kinase (PKA) and phosphorylation of cAMP response element-binding protein (CREB), the transcription coactivator of the PGC-l alpha gene, was found. Hydroxytyrosol prevented the decline in the expression of the PGC-la transcription cascade of OXPHOS complexes in serum-starved fibroblast cultures. The positive effect of HT was associated with activation of PKA and CREB phosphorylation. These results show involvement of PKA, CREB and PGC-1a in the regulation of OXPHOS in cell transition from the replicating to the quiescent state. (c) 2014 Elsevier B.V. All rights reserved,
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