Plasmalogens Inhibit Endocytosis of Toll-like Receptor 4 to Attenuate the Inflammatory Signal in Microglial Cells.

Abstract:

:Microglial activation is a pathological feature of many neurodegenerative diseases and the role of cellular lipids in these diseases is mostly unknown. It was known that the special ether lipid plasmalogens (Pls) were reduced in the brain and blood samples of Alzheimer's disease (AD) patients. It has recently been reported that the oral ingestion of scallop-derived Pls (sPls) improved cognition among mild AD patients, which led us to investigate the role of sPls in the microglial activation. We used the lipopolysaccharides (LPS)-induced microglial activation model and found that sPls inhibit the LPS-mediated TLR4 endocytosis and the downstream caspases activation. By using the specific inhibitors, we also confirmed that the TLR4 endocytosis and the caspases activation strictly controlled the pro-inflammatory cytokine expression. In addition, the reduction of cellular Pls by sh-RNA-mediated knockdown of GNPAT (glyceronephosphate O-acyltransferase), a Pls synthesizing enzyme, enhanced the endocytosis of TLR4 and activation of caspase-3 which resulted in the enhanced pro-inflammatory cytokine expression. We also report for the first time that the TLR4 endocytosis was significantly higher in the cortex of aged mice and AD model mice brains, proposing a significant link between the age-related reduction of Pls and microglial activation. Interestingly, the sPls drinking in AD model mice significantly reduced the TLR4 endocytosis. Our cumulative data indicates that the cellular Pls attenuate the microglial activation by maintaining the endocytosis of TLR4, suggesting a possible mechanism of the cognition improvement effect of sPls among mild AD patients.

journal_name

Mol Neurobiol

journal_title

Molecular neurobiology

authors

Ali F,Hossain MS,Sejimo S,Akashi K

doi

10.1007/s12035-018-1307-2

subject

Has Abstract

pub_date

2019-05-01 00:00:00

pages

3404-3419

issue

5

eissn

0893-7648

issn

1559-1182

pii

10.1007/s12035-018-1307-2

journal_volume

56

pub_type

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