Lipid Modulation of Ion Channel Function

Ion channels are fundamental membrane proteins that mediate selective ion flow across biological membranes and thereby govern excitability, signaling, and homeostasis in virtually all cell types. Although channel function is determined by intrinsic structural features, the surrounding lipid milieu is now recognized as a decisive regulatory layer. Lipids tune ion channel activity through complementary mechanisms: they can bind directly to channel proteins, reshape bilayer physical properties, or act as signaling messengers that couple extracellular cues to channel gating. In addition, the organization of membranes into lipid microdomains such as rafts and caveolae can cluster channels with receptors and scaffolds, enhancing signaling specificity and efficiency. Recent advances in cryo-electron microscopy and molecular simulations have expanded our understanding of these lipid–channel interactions, revealing lipids as active modulators rather than passive structural components. This review provides a comprehensive overview of the principles by which lipids regulate ion channel function and highlights the biological and potential clinical significance of this fundamental interplay.