Mitochondrial electron transport chain and outer membrane integrity (ETC/MOM)

The mitochondrial electron transport chain (ETC) and outer membrane integrity represent a critical functional system that integrates cellular energy production with the regulation of programmed cell death (PubMed, 2023). The ETC consists of a series of protein complexes (I-IV) and electron carriers located in the inner mitochondrial membrane that facilitate oxidative phosphorylation to generate ATP (NIH, 2024). Maintaining the integrity of the mitochondrial outer membrane is essential to prevent the release of pro-apoptotic factors, such as cytochrome c, into the cytosol—a process primarily governed by the BCL-2 protein family and the mitochondrial permeability transition pore (mPTP) (StatPearls, 2023). Dysregulation of this system, characterized by reduced ATP synthesis, increased reactive oxygen species (ROS) production, and premature membrane permeabilization, is a hallmark of various pathologies, including neurodegenerative diseases, cardiovascular disorders, and ischemia-reperfusion injury (PubMed, 2023). Therapeutic strategies targeting this system include stabilizing mitochondrial membranes (e.g., via cardiolipin-binding agents like elamipretide) to enhance bioenergetics or inducing membrane permeabilization (e.g., via BCL-2 inhibitors) to trigger apoptosis in malignant cells (PubMed, 2023).

Other names

Mitochondrial respiratory chainOxidative phosphorylation (OXPHOS) systemMitochondrial membrane systemMitochondrial outer membrane permeabilization (MOMP) pathwayMitochondrial permeability transition pore (mPTP) complex

Stabilization of cardiolipin to optimize electron transport and prevent cytochrome c release; inhibition of respiratory chain complexes (I-IV); modulation of BCL-2 family proteins to regulate outer membrane permeabilization; and inhibition of the mitochondrial permeability transition pore (mPTP).