Sevoflurane anesthesia impairs metabotropic glutamate receptor-dependent long-term depression and cognitive functions in senile mice.

Abstract:

AIM:Postoperative cognitive dysfunction is often observed in older patients. Previous reports described the link between postoperative cognitive dysfunction and general anesthetics, such as sevoflurane, but the exact mechanism remains unclear. We therefore sought to characterize the effects of sevoflurane on hippocampal-dependent cognitive functions, as well as hippocampal plasticity, and to delineate the underlying mechanisms. METHODS:Behavioral assays including the novel object recognition test and the Morris water maze test were carried out to assess the cognitive performance of control and sevoflurane-exposed mice. Electrophysiological recordings were carried out to evaluate the sevoflurane-induced changes of synaptic plasticity in the hippocampus. Furthermore, western blot assay was utilized to quantitatively assess the altered protein expression resulting from sevoflurane exposure. RESULTS:Sevoflurane anesthesia impaired cognitive functions, as well as metabotropic glutamate receptor-dependent long-term depression, through elevated surface expression of small conductance calcium-activated potassium type 2 channels. Blockage of calcium-activated potassium type 2 channels reversed the sevoflurane-induced deficits at both cellular and behavioral levels. CONCLUSIONS:Sevoflurane anesthesia impaired metabotropic glutamate receptor-dependent long-term depression and thereby affected cognitive functions in old mice. Inhibitory modulators of calcium-activated potassium type 2 channels might prevent cognitive decline elicited by sevoflurane. Geriatr Gerontol Int 2019; 19: 357-362.

journal_name

Geriatr Gerontol Int

authors

Yu X,Zhang F,Shi J

doi

10.1111/ggi.13619

subject

Has Abstract

pub_date

2019-04-01 00:00:00

pages

357-362

issue

4

eissn

1444-1586

issn

1447-0594

journal_volume

19

pub_type

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