Phosphatidylcholine lipid bilayer (PC bilayer)

The phosphatidylcholine lipid bilayer is the primary structural matrix of eukaryotic cell membranes, composed of amphipathic phospholipids with a choline head group and two fatty acid tails (Alberts et al., Molecular Biology of the Cell, 2002). It functions as a selective permeability barrier, maintaining the distinct internal environment of cells and organelles while facilitating the localization and function of membrane-bound proteins (van Meer et al., Nature Reviews Molecular Cell Biology, 2008). In pathophysiology, changes in the composition or fluidity of the PC bilayer are associated with conditions such as respiratory distress syndrome, where surfactant deficiency leads to alveolar collapse, and various metabolic disorders (Agassandian & Mallampalli, Biochimica et Biophysica Acta, 2013). Therapeutic interventions often target the bilayer to either disrupt it, as seen with certain antimicrobial peptides and antifungal agents like Amphotericin B, or to restore its function through lipid replacement therapies (Yeaman & Yount, Pharmacological Reviews, 2003; Escribá et al., Journal of Cellular and Molecular Medicine, 2008). Additionally, the PC bilayer is a critical component in the formulation of liposomal drug delivery systems, which enhance the bioavailability and reduce the toxicity of encapsulated drugs (van Meer et al., 2008). Understanding the biophysical properties of this bilayer is essential for developing treatments that modulate membrane-associated signaling pathways and cellular stability (Escribá et al., 2008).

Other names

Lecithin bilayerPhosphatidylcholine membraneGlycerophosphocholine bilayer

Membrane disruption, pore formation, and membrane stabilization (Yeaman & Yount, 2003; Escribá et al., 2008)