Cellular and mucous membranes

Cellular and mucous membranes are fundamental biological barriers that separate internal physiological environments from external stressors (Nature Education, 2014). Cellular membranes consist of phospholipid bilayers with embedded proteins that facilitate transport and signaling, while mucous membranes (mucosae) are specialized epithelial layers that secrete protective mucus to line internal tracts such as the respiratory and gastrointestinal systems (StatPearls, 2023). These structures are not individual molecular targets but rather complex tissues that serve as the site of action for various pharmacological agents (NIH, 2022). For instance, local anesthetics like lidocaine exert their effect by stabilizing these membranes and inhibiting ion channel activity, while many antimicrobial agents, such as amphotericin B, work by directly binding to and disrupting the integrity of fungal cell membranes (PubMed, 2021; PubChem, 2024). Pathological conditions like mucositis, infections, and mechanical trauma can compromise these barriers, leading to significant clinical complications (StatPearls, 2023). In drug development, the permeability and integrity of these membranes are primary factors in determining the bioavailability and delivery route of therapeutic compounds.

Other names

MucosaMucous membranePlasma membraneBiological membraneEpithelial barrier

Drugs interacting with these structures typically act by modulating membrane permeability, providing physical protection/lubrication, or inhibiting ion channels and receptors embedded within the lipid bilayer to achieve local anesthesia or antimicrobial effects.