Cellular membranes and intracellular components

Cellular membranes and intracellular components represent the structural framework and internal compartments of a cell, primarily composed of phospholipid bilayers, cholesterol, and various proteins (StatPearls: Physiology, Cell Membrane). These components are essential for maintaining cellular homeostasis, facilitating signal transduction, and providing a controlled environment for biochemical reactions. In pharmacology, while most drugs target specific proteins like receptors or enzymes, certain classes of therapeutic agents exert their effects by directly interacting with or disrupting the physical integrity of these membranes (NCBI: Lipid Bilayer as a Drug Target). For instance, polyene antifungals like Amphotericin B bind to sterols in the membrane to create pores, leading to the leakage of intracellular contents and subsequent cell death (NCBI: Mechanism of Action of Amphotericin B). Similarly, lipopeptide antibiotics like Daptomycin insert into bacterial membranes to induce rapid depolarization (NCBI: Daptomycin). Because these structures are fundamental to all living cells, drugs targeting them must exploit specific differences in composition, such as the presence of ergosterol in fungi versus cholesterol in humans, to achieve a therapeutic index and minimize host toxicity.

Other names

Biological membranesPlasma membraneCytoplasmic componentsIntracellular organellesCellular lipid bilayers

Direct physical disruption of the lipid bilayer, pore formation, alteration of membrane fluidity, and interference with electrochemical gradients.