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Published in: Journal of Neuroinflammation 1/2018

Open Access 01-12-2018 | Research

Complement activation contributes to perioperative neurocognitive disorders in mice

Authors: Chao Xiong, Jinhu Liu, Dandan Lin, Juxia Zhang, Niccolò Terrando, Anshi Wu

Published in: Journal of Neuroinflammation | Issue 1/2018

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Abstract

Background

The complement system plays an important role in many neurological disorders.
Complement modulation, including C3/C3a receptor signaling, shows promising therapeutic effects on cognition and neurodegeneration. Yet, the implications for this pathway in perioperative neurocognitive disorders (PND) are not well established. Here, we evaluated the possible role for C3/C3a receptor signaling after orthopedic surgery using an established mouse model of PND.

Methods

A stabilized tibial fracture surgery was performed in adult male C57BL/6 mice under general anesthesia and analgesia to induce PND-like behavior. Complement activation was assessed in the hippocampus and choroid plexus. Changes in hippocampal neuroinflammation, synapse numbers, choroidal blood-cerebrospinal fluid barrier (BCSFB) integrity, and hippocampal-dependent memory function were evaluated after surgery and treatment with a C3a receptor blocker.

Results

C3 levels and C3a receptor expression were specifically increased in hippocampal astrocytes and microglia after surgery. Surgery-induced neuroinflammation and synapse loss in the hippocampus were attenuated by C3a receptor blockade. Choroidal BCSFB dysfunction occurred 1 day after surgery and was attenuated by C3a receptor blockade. Administration of exogenous C3a exacerbated cognitive decline after surgery, whereas C3a receptor blockade improved hippocampal-dependent memory function.

Conclusions

Orthopedic surgery activates complement signaling. C3a receptor blockade may be therapeutically beneficial to attenuate neuroinflammation and PND.
Appendix
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Metadata
Title
Complement activation contributes to perioperative neurocognitive disorders in mice
Authors
Chao Xiong
Jinhu Liu
Dandan Lin
Juxia Zhang
Niccolò Terrando
Anshi Wu
Publication date
01-12-2018
Publisher
BioMed Central
Published in
Journal of Neuroinflammation / Issue 1/2018
Electronic ISSN: 1742-2094
DOI
https://doi.org/10.1186/s12974-018-1292-4

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