Mitochondrial inner membrane (MIM) (MIM)

The mitochondrial inner membrane (MIM) is a highly protein-dense lipid bilayer that serves as the primary site for cellular energy production through oxidative phosphorylation. It is uniquely characterized by the presence of cardiolipin, a dimeric phospholipid that is essential for the assembly and stability of respiratory chain supercomplexes and the maintenance of cristae morphology (PMID: 30639642). The mitochondrial lipid environment specifically refers to this cardiolipin-rich milieu, which is highly susceptible to oxidative damage due to its proximity to the electron transport chain. In diseases such as heart failure, Barth syndrome, and ischemia-reperfusion injury, cardiolipin peroxidation leads to the collapse of cristae and the release of pro-apoptotic factors like cytochrome c (PMID: 24631325). Drugs like elamipretide (SS-31) target this environment by binding to cardiolipin, thereby preventing its oxidation and preserving mitochondrial bioenergetics (PMID: 23861545). Consequently, the MIM is an emerging therapeutic target for conditions characterized by mitochondrial decay and metabolic dysfunction.

Other names

Inner mitochondrial membraneIMMMitochondrial lipid bilayerCardiolipin-rich membrane environment

Cardiolipin stabilization and protection against lipid peroxidation to maintain cristae structure and electron transport chain efficiency.