Cellular and mitochondrial membranes

Cellular and mitochondrial membranes are fundamental lipid bilayer structures that define the boundaries of the cell and its energy-producing organelles. The plasma membrane is responsible for maintaining ion gradients, facilitating cell signaling, and protecting the cytoplasm, while the mitochondrial membranes—specifically the inner and outer membranes—are the primary sites for the electron transport chain and ATP synthesis (StatPearls, 2023). These membranes play a pivotal role in disease; for instance, mitochondrial membrane permeabilization is a key step in the initiation of apoptosis, and alterations in membrane fluidity are observed in various cancers and neurodegenerative states (Nature Reviews Molecular Cell Biology, 2018). Therapeutic strategies targeting these membranes include antimicrobial agents like daptomycin and polymyxins that disrupt bacterial membrane integrity, and mitochondrial-targeted compounds like elamipretide that bind to cardiolipin to stabilize the inner mitochondrial membrane (Journal of the American College of Cardiology, 2016). However, the ubiquitous nature of lipid bilayers presents a challenge for drug selectivity, often leading to side effects such as nephrotoxicity or hemolysis (Clinical Microbiology Reviews, 2013). Understanding the unique lipid compositions, such as the presence of ergosterol in fungi or cardiolipin in mitochondria, allows for the development of more specific membrane-active therapies.

Other names

Plasma membraneMitochondrial lipid bilayerCytoplasmic membraneInner mitochondrial membraneOuter mitochondrial membrane

Binding to cardiolipin to stabilize mitochondrial cristae; disruption of bacterial membrane integrity through pore formation; alteration of membrane potential; inhibition of oxidative stress by targeting the lipid bilayer.