Cell cycle progression is regulated by intertwined redox oscillators - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Theoretical Biology and Medical Modelling Année : 2015

Cell cycle progression is regulated by intertwined redox oscillators

Résumé

The different phases of the eukaryotic cell cycle are exceptionally well-preserved phenomena. DNA decompaction, RNA and protein synthesis (in late G1 phase) followed by DNA replication (in S phase) and lipid synthesis (in G2 phase) occur after resting cells (in G0) are committed to proliferate. The G1 phase of the cell cycle is characterized by an increase in the glycolytic metabolism, sustained by high NAD+/NADH ratio. A transient cytosolic acidification occurs, probably due to lactic acid synthesis or ATP hydrolysis, followed by cytosolic alkalinization. A hyperpolarized transmembrane potential is also observed, as result of sodium/potassium pump (NaK-ATPase) activity. During progression of the cell cycle, the Pentose Phosphate Pathway (PPP) is activated by increased NADP+/NADPH ratio, converting glucose 6-phosphate to nucleotide precursors. Then, nucleic acid synthesis and DNA replication occur in S phase. Along with S phase, unpublished results show a cytosolic acidification, probably the result of glutaminolysis occurring during this phase. In G2 phase there is a decrease in NADPH concentration (used for membrane lipid synthesis) and a cytoplasmic alkalinization occurs. Mitochondria hyperfusion matches the cytosolic acidification at late G1/S transition and then triggers ATP synthesis by oxidative phosphorylation. We hypothesize here that the cytosolic pH may coordinate mitochondrial activity and thus the different redox cycles, which in turn control the cell metabolism.
Fichier principal
Vignette du fichier
s12976-015-0005-2.pdf (1.41 Mo) Télécharger le fichier
Origine : Publication financée par une institution
Loading...

Dates et versions

hal-01158514 , version 1 (13-10-2015)

Identifiants

Citer

Jorgelindo da Veiga Moreira, Sabine Pérès, Jean-Marc Steyaert, Erwan Bigan, Loïc Paulevé, et al.. Cell cycle progression is regulated by intertwined redox oscillators. Theoretical Biology and Medical Modelling, 2015, 12 (1), pp.10. ⟨10.1186/s12976-015-0005-2⟩. ⟨hal-01158514⟩
650 Consultations
160 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More