The dual fates of exogenous tau seeds: Lysosomal clearance versus cytoplasmic amplification.
The dual fates of exogenous tau seeds: Lysosomal clearance versus cytoplasmic amplification.
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DOI：
10.1016/j.jbc.2022.102014
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发表时间：
2022-06
影响因子：
4.8
通讯作者：
Diamond, Marc I.
中科院分区：
文献类型：
--
作者：
Kolay, Sourav;Vega, Anthony R.;Dodd, Dana A.;Perez, Valerie A.;Kashmer, Omar M.;White, Charles L.;Diamond, Marc I.
Tau assembly movement from the extracellular to intracellular space may underlie transcellular propagation of neurodegenerative tauopathies. This begins with tau binding to cell surface heparan sulfate proteoglycans, which triggers macropinocytosis. Pathological tau assemblies are proposed then to exit the vesicular compartment as “seeds” for replication in the cytoplasm. Tau uptake is highly efficient, but only ∼1 to 10% of cells that endocytose aggregates exhibit seeding. Consequently, we studied fluorescently tagged full-length (FL) tau fibrils added to native U2OS cells or “biosensor” cells expressing FL tau or repeat domain. FL tau fibrils bound tubulin. Seeds triggered its aggregation in multiple locations simultaneously in the cytoplasm, generally independent of visible exogenous aggregates. Most exogenous tau trafficked to the lysosome, but fluorescence imaging revealed a small percentage that steadily accumulated in the cytosol. Intracellular expression of Gal3-mRuby, which binds intravesicular galactosides and forms puncta upon vesicle rupture, revealed no evidence of vesicle damage following tau exposure, and most seeded cells had no evidence of endolysosome rupture. However, live-cell imaging indicated that cells with pre-existing Gal3-positive puncta were seeded at a slightly higher rate than the general population, suggesting a potential predisposing role for vesicle instability. Clearance of tau seeds occurred rapidly in both vesicular and cytosolic fractions. The lysosome/autophagy inhibitor bafilomycin inhibited vesicular clearance, whereas the proteasome inhibitor MG132 inhibited cytosolic clearance. Tau seeds that enter the cell thus have at least two fates: lysosomal clearance that degrades most tau, and entry into the cytosol, where seeds amplify, and are cleared by the proteasome.
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影响因子：
4.8
作者：
Stopschinski, Barbara E.;Holmes, Brandon B.;Diamond, Marc I.
通讯作者：
Diamond, Marc I.
影响因子：
4.8
作者：
Guo, Jing L.;Lee, Virginia M. -Y.
通讯作者：
Lee, Virginia M. -Y.
DOI：
10.1074/jbc.m117.809293
发表时间：
2018-02-16
期刊：
The Journal of biological chemistry
影响因子：
--
作者：
Falcon B;Noad J;McMahon H;Randow F;Goedert M
通讯作者：
Goedert M
影响因子：
4
作者：
Festa BP;Barbosa AD;Rob M;Rubinsztein DC
通讯作者：
Rubinsztein DC
影响因子：
3.4
作者：
Paz, Irit;Sachse, Martin;Sansonetti, Philippe
通讯作者：
Sansonetti, Philippe