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Journal of Neuroinflammation

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Open Access 01-12-2022 | Central Nervous System Trauma | Research

TREM2 activation alleviates neural damage via Akt/CREB/BDNF signalling after traumatic brain injury in mice

Authors: Jin Yan, Yuan Zhang, Lin Wang, Zhao Li, Shuang Tang, Yingwen Wang, Nina Gu, Xiaochuan Sun, Lin Li

Published in: Journal of Neuroinflammation | Issue 1/2022

Abstract

Background

Neuroinflammation is one of the most important processes in secondary injury after traumatic brain injury (TBI). Triggering receptor expressed on myeloid cells 2 (TREM2) has been proven to exert neuroprotective effects in neurodegenerative diseases and stroke by modulating neuroinflammation, and promoting phagocytosis and cell survival. However, the role of TREM2 in TBI has not yet been elucidated. In this study, we are the first to use COG1410, an agonist of TREM2, to assess the effects of TREM2 activation in a murine TBI model.

Methods

Adult male wild-type (WT) C57BL/6 mice and adult male TREM2 KO mice were subjected to different treatments. TBI was established by the controlled cortical impact (CCI) method. COG1410 was delivered 1 h after CCI via tail vein injection. Western blot analysis, immunofluorescence, laser speckle contrast imaging (LSCI), neurological behaviour tests, brain electrophysiological monitoring, Evans blue assays, magnetic resonance imaging (MRI), and brain water content measurement were performed in this study.

Results

The expression of endogenous TREM2 peaked at 3 d after CCI, and it was mainly expressed on microglia and neurons. We found that COG1410 improved neurological functions within 3 d, as well as neurological functions and brain electrophysiological activity at 2 weeks after CCI. COG1410 exerted neuroprotective effects by inhibiting neutrophil infiltration and microglial activation, and suppressing neuroinflammation after CCI. In addition, COG1410 treatment alleviated blood brain barrier (BBB) disruption and brain oedema; furthermore, COG1410 promoted cerebral blood flow (CBF) recovery at traumatic injury sites after CCI. In addition, COG1410 suppressed neural apoptosis at 3 d after CCI. TREM2 activation upregulated p-Akt, p-CREB, BDNF, and Bcl-2 and suppressed TNF-α, IL-1β, Bax, and cleaved caspase-3 at 3 d after CCI. Moreover, TREM2 knockout abolished the effects of COG1410 on vascular phenotypes and microglial states. Finally, the neuroprotective effects of COG1410 were suppressed by TREM2 depletion.

Conclusions

Altogether, we are the first to demonstrate that TREM2 activation by COG1410 alleviated neural damage through activation of Akt/CREB/BDNF signalling axis in microglia after CCI. Finally, COG1410 treatment improved neurological behaviour and brain electrophysiological activity after CCI.

Graphical Abstract

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Title: TREM2 activation alleviates neural damage via Akt/CREB/BDNF signalling after traumatic brain injury in mice
Authors: Jin Yan
Yuan Zhang
Lin Wang
Zhao Li
Shuang Tang
Yingwen Wang
Nina Gu
Xiaochuan Sun
Lin Li
Publication date: 01-12-2022
Publisher: BioMed Central
Keyword: Central Nervous System Trauma
Published in: Journal of Neuroinflammation / Issue 1/2022
Electronic ISSN: 1742-2094
DOI: https://doi.org/10.1186/s12974-022-02651-3

Keynote webinar | Spotlight on medication adherence

Springer Medicine

TREM2 activation alleviates neural damage via Akt/CREB/BDNF signalling after traumatic brain injury in mice

Abstract

Background

Methods

Results

Conclusions

Graphical Abstract

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Abstract

Background

Methods

Results

Conclusions

Graphical Abstract

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