Glymphatic system clears extracellular tau and protects from tau aggregation and neurodegeneration

Kazuhisa Ishida, Kaoru Yamada, Risa Nishiyama, Tadafumi Hashimoto, Itaru Nishida, Yoichiro Abe, Masato Yasui, Takeshi Iwatsubo

研究成果: Article査読

抄録

Accumulation of tau has been implicated in various neurodegenerative diseases termed tauopathies. Tau is a microtubule-associated protein but is also actively released into the extracellular fluids including brain interstitial fluid and cerebrospinal fluid (CSF). However, it remains elusive whether clearance of extracellular tau impacts tau-associated neurodegeneration. Here, we show that aquaporin-4 (AQP4), a major driver of the glymphatic clearance system, facilitates the elimination of extracellular tau from the brain to CSF and subsequently to deep cervical lymph nodes. Strikingly, deletion of AQP4 not only elevated tau in CSF but also markedly exacerbated phosphorylated tau deposition and the associated neurodegeneration in the brains of transgenic mice expressing P301S mutant tau. The current study identified the clearance pathway of extracellular tau in the central nervous system, suggesting that glymphatic clearance of extracellular tau is a novel regulatory mechanism whose impairment contributes to tau aggregation and neurodegeneration.

本文言語English
論文番号e20211275
ジャーナルJournal of Experimental Medicine
219
3
DOI
出版ステータスPublished - 2022 3月 7

ASJC Scopus subject areas

  • 医学(全般)

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