Abstract:
:There is developing interest in the potential association between anesthesia and the onset and progression of Alzheimer's disease. Several anesthetics have, thus, been demonstrated to induce tau hyperphosphorylation, an effect mostly mediated by anesthesia-induced hypothermia. Here, we tested the hypothesis that acute normothermic administration of dexmedetomidine (Dex), an intravenous sedative used in intensive care units, would result in tau hyperphosphorylation in vivo and in vitro. When administered to nontransgenic mice, Dex-induced tau hyperphosphorylation persisting up to 6 hours in the hippocampus for the AT8 epitope. Pretreatment with atipamezole, a highly specific α2-adrenergic receptor antagonist, blocked Dex-induced tau hyperphosphorylation. Furthermore, Dex dose-dependently increased tau phosphorylation at AT8 in SH-SY5Y cells, impaired mice spatial memory in the Barnes maze and promoted tau hyperphosphorylation and aggregation in transgenic hTau mice. These findings suggest that Dex: (1) increases tau phosphorylation, in vivo and in vitro, in the absence of anesthetic-induced hypothermia and through α2-adrenergic receptor activation, (2) promotes tau aggregation in a mouse model of tauopathy, and (3) impacts spatial reference memory.
journal_name
Neurobiol Agingjournal_title
Neurobiology of agingauthors
Whittington RA,Virág L,Gratuze M,Petry FR,Noël A,Poitras I,Truchetti G,Marcouiller F,Papon MA,El Khoury N,Wong K,Bretteville A,Morin F,Planel Edoi
10.1016/j.neurobiolaging.2015.05.002subject
Has Abstractpub_date
2015-08-01 00:00:00pages
2414-28issue
8eissn
0197-4580issn
1558-1497pii
S0197-4580(15)00241-9journal_volume
36pub_type
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