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Fate and propagation of endogenously formed Tau aggregates in neuronal cells.

EMBO molecular medicine (2020-11-13)
Patricia Chastagner, Frida Loria, Jessica Y Vargas, Josh Tois, Marc I Diamond, George Okafo, Christel Brou, Chiara Zurzolo
ZUSAMMENFASSUNG

Tau accumulation in the form of neurofibrillary tangles in the brain is a hallmark of tauopathies such as Alzheimer's disease (AD). Tau aggregates accumulate in brain regions in a defined spatiotemporal pattern and may induce the aggregation of native Tau in a prion-like manner. However, the underlying mechanisms of cell-to-cell spreading of Tau pathology are unknown and could involve encapsulation within exosomes, trans-synaptic passage, and tunneling nanotubes (TNTs). We have established a neuronal cell model to monitor both internalization of externally added fibrils, synthetic (K18) or Tau from AD brain extracts, and real-time conversion of microtubule-binding domain of Tau fused to a fluorescent marker into aggregates. We found that these endogenously formed deposits colabel with ubiquitin and p62 but are not recruited to macroautophagosomes, eventually escaping clearance. Furthermore, endogenous K18-seeded Tau aggregates spread to neighboring cells where they seed new deposits. Transfer of Tau aggregates depends on direct cell contact, and they are found inside TNTs connecting neuronal cells. We further demonstrate that contact-dependent transfer occurs in primary neurons and between neurons and astrocytes in organotypic cultures.

MATERIALIEN
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Marke
Produktbeschreibung

Millipore
Benzonase® Nuklease, ≥250 units/μL, ≥90% (SDS-PAGE), recombinant, expressed in E. coli, buffered aqueous glycerol solution
Sigma-Aldrich
Proteasehemmer-Cocktail, for use with mammalian cell and tissue extracts, DMSO solution
Sigma-Aldrich
Triton X-100, laboratory grade
Sigma-Aldrich
Monoklonaler Anti-α-Tubulin-Antikörper in Maus hergestellte Antikörper, clone DM1A, ascites fluid
Sigma-Aldrich
Lysozym aus Hühnereiweiss, 10 mg/mL
Sigma-Aldrich
CK-666, ≥98% (HPLC), powder