What molecular mechanisms determine whether tau is routed to lysosomal degradation versus exosomal secretion?

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Description

The abstract describes a critical decision point where tau can either be degraded via lysosomes or secreted via exosomes, but the molecular switches governing this routing are poorly defined. Understanding these mechanisms is essential for developing targeted therapies that could enhance tau clearance while preventing pathological propagation.

Gap type: unexplained_observation Source paper: Role of the endolysosomal pathway and exosome release in tau propagation. (2021, Neurochem Int, PMID:33582164)

Resolution criteria

Resolution requires: (1) Biochemical fractionation (differential centrifugation + density gradient) in neurons treated with >=3 stressors (MG132, hydrogen peroxide, tunicamycin) tracing tau species in lysosomal vs exosomal compartments with proteomics identifying >=5 proteins that bias routing to one pathway; (2) CRISPR screen or siRNA knockdown of >=10 identified candidates with functional rescue demonstrating shift in tau routing (>=30% change in exosomal:lysosomal tau ratio); (3) Patient样本 (CSF exosomal tau and brain autopsy) demonstrating that the identified routing mechanisms correlate with disease progression rate. Tau detection in compartments without identifying routing decision mechanism is insufficient.

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