Lysosomal membrane lipid raft

The lysosomal membrane and its associated lipid rafts are specialized microdomains within the lysosomal bilayer enriched in cholesterol, sphingolipids, and specific proteins like Lysosomal-associated membrane proteins (Boya & Kroemer, 2008). These rafts serve as critical platforms for the assembly of signaling complexes, most notably the mTORC1 complex, which regulates cell growth and metabolism in response to nutrient availability (Zoncu et al., 2011). In many cancer cells, the lysosomal membrane is destabilized, making it a vulnerable target for lysosomotropic agents that induce lysosomal membrane permeabilization (LMP) and subsequent programmed cell death (Boya & Kroemer, 2008). Additionally, defects in the lipid composition of these rafts are central to the pathogenesis of lysosomal storage disorders, such as Niemann-Pick type C, where cholesterol accumulation disrupts normal trafficking (Platt et al., 2012). Therapeutic strategies targeting these domains include small molecules that alter lysosomal pH, stabilize or destabilize the membrane, or modulate lipid metabolism to restore homeostasis (Settembre et al., 2013). Drugs like hydroxychloroquine and siramesine exploit these properties to treat autoimmune diseases or investigate anti-tumor effects by disrupting lysosomal integrity (Boya & Kroemer, 2008).

Other names

Lysosomal membraneLipid raftsLysosomal lipid microdomainLysosomal membrane raftDetergent-resistant membrane of the lysosome

Induction of lysosomal membrane permeabilization (LMP), inhibition of lysosomal acidification, and modulation of lipid-protein interactions within membrane microdomains.