Mitochondrial oxidative metabolism (OXPHOS)

Mitochondrial oxidative metabolism refers to the integrated biochemical pathways, primarily oxidative phosphorylation (OXPHOS), used by mitochondria to convert nutrients into adenosine triphosphate (ATP) [StatPearls: NBK553175]. This process involves the electron transport chain (ETC), where electrons from NADH and FADH2 are transferred through a series of protein complexes (I-IV) to oxygen, creating a proton gradient that drives ATP synthase (Complex V) [NIH: Mitochondrial Diseases]. Beyond energy production, these pathways regulate cellular redox states, calcium signaling, and programmed cell death (apoptosis) [PubMed: 29123076]. Dysfunction in these processes is central to the pathogenesis of primary mitochondrial DNA mutations, as well as secondary roles in neurodegeneration, aging, and metabolic syndrome [Nature Reviews Molecular Cell Biology: 10.1038/s41580-018-0003-2]. Therapeutic strategies include the use of antioxidants, ETC modulators like Metformin (which inhibits Complex I), or agents that promote mitochondrial biogenesis to restore metabolic balance [PubChem: Metformin]. However, pharmacological manipulation of these pathways is challenging due to the risk of inducing lactic acidosis or excessive reactive oxygen species (ROS) production [PubMed: 23643361].

Other names

Cellular respirationOxidative phosphorylationMitochondrial bioenergeticsAerobic metabolismMitochondrial respiratory chainElectron transport chain activity

Drugs modulate this process by inhibiting specific complexes of the electron transport chain (e.g., Complex I inhibition by Metformin), acting as alternative electron carriers (e.g., Idebenone), uncoupling the proton gradient from ATP synthesis (e.g., DNP), or stabilizing mitochondrial membranes (e.g., Elamipretide) [PubMed: 23643361, PubChem: Metformin].