Endosomal and lysosomal membranes

The endosomal and lysosomal membranes are dynamic lipid bilayers that define the boundaries of the endolysosomal system, a critical network for cellular degradation, recycling, and signaling. These membranes maintain a highly acidic internal environment through the action of vacuolar H+-ATPases, which is essential for the function of over 60 different acid hydrolases responsible for breaking down macromolecules (Source: Nature Reviews Molecular Cell Biology, 2017). Beyond degradation, these membranes serve as essential platforms for nutrient sensing via the mTORC1 complex and regulate ion homeostasis, particularly calcium signaling (Source: Journal of Cell Science, 2018). In oncology, the integrity of the lysosomal membrane is a therapeutic vulnerability; inducing lysosomal membrane permeabilization (LMP) can release pro-apoptotic cathepsins into the cytosol to bypass traditional cell death resistance (Source: Cold Spring Harbor Perspectives in Biology, 2013). Conversely, in lysosomal storage disorders and neurodegenerative diseases like Parkinson's, membrane dysfunction due to lipid accumulation leads to impaired autophagy and toxic protein aggregation (Source: Lancet Neurology, 2018). Pharmacological modulation of these membranes includes the use of lysosomotropic agents like chloroquine, which alkalinize the lumen to inhibit viral entry and modulate immune responses, as well as small molecule chaperones that stabilize membrane-associated proteins (Source: Nature Reviews Drug Discovery, 2020).

Other names

Endolysosomal systemLysosomal membraneEndosomal membraneVacuolar membranesEndolysosomal compartment

Lysosomal membrane permeabilization (LMP), Endosomal pH modulation, Inhibition of endosome-lysosome fusion, Lipid composition modulation, Lysosomotropism