LRP1 and SORL1 regulate tau internalization and degradation and enhance tau seeding
Cooper, J. M.; Lathuiliere, A.; Migliorini, M.; Arai, A. L.; Wani, M. M.; Dujardin, S.; Muratoglu, S. C.; Hyman, B. T.; Strickland, D.
Show abstract
The identification of the apoE receptor, LRP1, as an endocytic receptor for tau raises several questions about LRP1s role in tauopathies. Is internalized tau, like other LRP1 ligands, delivered to lysosomes for degradation? Does LRP1 internalize pathological tau leading to cytosolic seeding? Do other, related receptors participate in these processes? We confirm that LRP1 rapidly internalizes tau, leading to efficient lysosomal degradation. Employing brain homogenates from human Alzheimer brain, we find that LRP1 also mediates cytosolic tau seeding. We additionally found that another apoE receptor, SORL1, a gene implicated in AD risk, also mediates tau endocytosis, degradation, and release into the cytoplasm of seed competent species. These data suggest a role for these apoE receptors in tau uptake, as well as the competing processes of degradation and release to the cytoplasm. The balance of these processes may be fundamental to spread of neuropathology across the brain in Alzheimer disease.
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