Decreased lipidated ApoE-receptor interactions confer protection against pathogenicity of ApoE and its lipid cargoes in lysosomes
ApoE2 and ApoE Christchurch variants are defective in LDLR binding, thus reducing the uptake of ApoE and associated lipid cargoes. LDLR-mediated internalization and endolysosomal delivery of ApoE lipoprotein particles carrying cholesterol esterified with polyunsaturated fatty acids result in lipofuscin deposition with the allelic series ApoE2 < ApoE3 < ApoE4.