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Journal of Neuroinflammation
Published in: Journal of Neuroinflammation 1/2015

Open Access 01-12-2015 | Research

Decreased progranulin levels in patients and rats with subarachnoid hemorrhage: a potential role in inhibiting inflammation by suppressing neutrophil recruitment

Authors: Chenhui Zhou, Guangbin Xie, Chunxi Wang, Zihuan Zhang, Qiang Chen, Li Zhang, Lingyun Wu, Yongxiang Wei, Hui Ding, Chunhua Hang, Mengliang Zhou, Jixin Shi

Published in: Journal of Neuroinflammation | Issue 1/2015

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Abstract

Background

Subarachnoid hemorrhage (SAH) is a devastating neurological injury with high morbidity and mortality that is mainly caused by early brain injury (EBI). Progranulin (PGRN) is known to be involved in various biological functions, such as anti-inflammation and tissue repair. This study aimed to investigate the change of PGRN in the brain after SAH and its role on EBI.

Methods

The levels of PGRN, myeloperoxidase (MPO), interleukin1β (IL-1β), and tumor necrosis factor-α (TNF-α) were detected in the cerebrospinal fluid (CSF) from SAH patients by enzyme-linked immunosorbent assay (ELISA). In addition, PGRN levels were also detected in the cerebral cortex after experimental SAH in rats by western blotting and immunohistochemistry (IHC). Recombinant human PGRN (r-PGRN) or an equal volume of phosphate-buffered saline (PBS) was administrated at 30 min after SAH. All rats were subsequently sacrificed at 24 h after SAH. Neurological score and brain water content were assessed. For mechanistic studies, the changes of MPO, matrix metalloproteinase-9 (MMP-9), zonula occludens 1 (ZO-1), Bcl-2, and cleaved caspase-3 were examined by western blotting and the levels of pro-inflammatory cytokines (IL-1β and TNF-α) were determined by ELISA. In addition, neuronal apoptosis and blood brain barrier (BBB) permeability were examined.

Results

The levels of PGRN significantly decreased, and the levels of MPO, IL-1β, and TNF-α were markedly elevated in the CSF from SAH patients. In rats, PGRN levels in the brain also decreased after SAH. Administration of r-PGRN decreased brain water content and improved neurological scores at 24 h after SAH. These changes were associated with marked reductions in MPO, MMP-9, and proinflammation cytokine levels, as well as increased levels of Bcl-2 and ZO-1. In addition, neuronal apoptosis and BBB permeability were alleviated by r-PGRN.

Conclusions

These results indicate that the levels of PGRN decreased after SAH and that r-PGRN alleviates EBI after SAH possibly via inhibition of neutrophil recruitment, providing a new target for the treatment of SAH.
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Metadata
Title
Decreased progranulin levels in patients and rats with subarachnoid hemorrhage: a potential role in inhibiting inflammation by suppressing neutrophil recruitment
Authors
Chenhui Zhou
Guangbin Xie
Chunxi Wang
Zihuan Zhang
Qiang Chen
Li Zhang
Lingyun Wu
Yongxiang Wei
Hui Ding
Chunhua Hang
Mengliang Zhou
Jixin Shi
Publication date
01-12-2015
Publisher
BioMed Central
Published in
Journal of Neuroinflammation / Issue 1/2015
Electronic ISSN: 1742-2094
DOI
https://doi.org/10.1186/s12974-015-0415-4

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