Abstract
Neurofibrillary tangles (NFTs) composed of hyperphosphorylated and misfolded tau protein are a pathological hallmark of Alzheimer’s disease and other tauopathy conditions. Tau is predominantly an intraneuronal protein but is also secreted in physiological and pathological conditions. The extracellular tau has been implicated in the seeding and propagation of tau pathology and is the prime target of the current tau immunotherapy. However, truncated tau species lacking the microtubule-binding repeat (MTBR) domains essential for seeding have been shown to undergo active secretion and the mechanisms and functional consequences of the various extracellular tau are poorly understood. We report here that the transcription factor EB (TFEB), a master regulator of lysosomal biogenesis, plays an essential role in the lysosomal exocytosis of selected tau species. TFEB loss of function significantly reduced the levels of interstitial fluid (ISF) tau in PS19 mice expressing P301S mutant tau and in conditioned media of mutant tau expressing primary neurons, while the secretion of endogenous wild-type tau was not affected. Mechanistically we found that TFEB regulates the secretion of truncated mutant tau lacking MTBR and this process is dependent on the lysosomal calcium channel TRPML1. Consistent with the seeding-incompetent nature of the truncated tau and supporting the concept that TFEB-mediated lysosomal exocytosis promotes cellular clearance, we show that reduced ISF tau in the absence of TFEB is associated with enhanced intraneuronal pathology and accelerated spreading. Our results support the idea that TFEB-mediated tau exocytosis serves as a clearance mechanism to reduce intracellular tau under pathological conditions and that effective tau immunotherapy should devoid targeting these extracellular tau species.
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Acknowledgements
We are grateful to R. Youle (NIH) for the gift of TFEB KO and TFEB, MITF and TFE3 TKO HeLa cells, M. Sardiello for the TFEB overexpressing TFEB HeLa line, C. Cook and L. Petrucelli for the tau-P301L expression vector and virus, and P. Davies (Feinstein Institute for Medical Research) for PHF1 and MC1 antibodies. We thank F. Stewart, B. Contreras, and N. Aithmitti for expert technical assistance and members of the Zheng laboratory for insightful discussions. This project was supported by the Gene Vector Core of Baylor College of Medicine and by grants from the NIH (R01 NS093652, R01 AG020670, and RF1 AG054111 and R01 AG057509 to HZ; R01 AG062734, R56 NS110980 to CMK), the Tau Consortium, and the Farrell Family Alzheimer’s Disease Research Fund (to CMK).
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YX and HZ designed the study; YX, with assistance from SD, performed all experiments and data analysis except iPSCs and in vivo microdialysis experiments, which were performed and analyzed in the CMK laboratory (JAM, KH, CS, CMK) and the DMH laboratory, respectively; AB provided Tcfeb floxed mice and advised some of the in vitro studies; YX and HZ wrote the paper with edits and critiques from DMH. All authors provided input, and read and approved the manuscript.
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Xu, Y., Du, S., Marsh, J.A. et al. TFEB regulates lysosomal exocytosis of tau and its loss of function exacerbates tau pathology and spreading. Mol Psychiatry 26, 5925–5939 (2021). https://doi.org/10.1038/s41380-020-0738-0
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DOI: https://doi.org/10.1038/s41380-020-0738-0