Cited by 85Intracerebral and Subarachnoid Hemorrhage ResearchBarrier Structure and Function StudiesTraumatic Brain Injury and Neurovascular Disturbances

P2X7 Receptor Suppression Preserves Blood-Brain Barrier through Inhibiting RhoA Activation after Experimental Intracerebral Hemorrhage in Rats

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Zhao, Hengli, Zhang, Xuan, Dai, Zhiqiang, Feng, Yang, Li, Qiang, Zhang, John H., Liu, Xin, Chen, Yujie +1 more·2016·Scientific Reports

Abstract

Blockading P2X7 receptor(P2X7R) provides neuroprotection toward various neurological disorders, including stroke, traumatic brain injury and subarachnoid hemorrhage. However, whether and how P2X7 receptor suppression protects blood-brain barrier(BBB) after intracerebral hemorrhage(ICH) remains unexplored. In present study, intrastriatal autologous-blood injection was used to mimic ICH in rats. Selective P2X7R inhibitor A438079, P2X7R agonist BzATP and P2X7R siRNA were administrated to evaluate the effects of P2X7R suppression. Selective RhoA inhibitor C3 transferase was administered to clarify the involvement of RhoA. Post-assessments, including neurological deficits, Fluoro-Jade C staining, brain edema, Evans blue extravasation and fluorescence, western blot, RhoA activity assay and immunohistochemistry were performed. Then the key results were verified in collagenase induced ICH model. We found that endogenous P2X7R increased at 3 hrs after ICH with peak at 24 hrs, then returned to normal at 72 hrs after ICH. Enhanced immunoreactivity was observed on the neurovascular structure around hematoma at 24 hrs after ICH, along with perivascular astrocytes and endothelial cells. Both A438079 and P2X7R siRNA alleviated neurological deficits, brain edema and BBB disruption after ICH, in association with RhoA activation and down-regulated endothelial junction proteins. However, BzATP abolished those effects. In addition, C3 transferase reduced brain injury and increased endothelial junction proteins’ expression after ICH. These data indicated P2X7R suppression could preserve BBB integrity after ICH through inhibiting RhoA activation.

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Authors
Zhao, H., Zhang, X., Dai, Z., Feng, Y., Li, Q., Zhang, J. H., Liu, X., Chen, Y., & Feng, H.
Affiliations
  • Army Medical University (CN)
  • Loma Linda University (US)
Corresponding author
  • Chen, Yujie
  • Feng, Hua
Venue
Scientific Reports
Published
2016-03-16
Volume
6
Issue
1
Pages
23286-23286
ISSN
2045-2322 (ISSN-L)
OpenAlex
W2315802744
Cited by
84
References
50
Citations by year
2026: 3 · 2025: 8 · 2024: 14 · 2023: 8 · 2022: 6 · 2021: 5 · 2020: 6 · 2019: 5 · 2018: 18 · 2017: 11
FWCI
8.52
Type
journal article
Language
en
Open access
Locations
  • Scientific Reports (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
  • National Natural Science Foundation of China (2014CB541600, 973 Program, 81501002, 81220108009)
  • National Key Research and Development Program of China (81501002, 81220108009, 2014CB541600)
Topics
  • Health Sciences › Medicine › Neurology › Intracerebral and Subarachnoid Hemorrhage Research
  • Life Sciences › Neuroscience › Neurology › Barrier Structure and Function Studies
  • Health Sciences › Medicine › Neurology › Traumatic Brain Injury and Neurovascular Disturbances
Keywords
P2X7 receptor, intracerebral hemorrhage, blood-brain barrier, RhoA, A438079, BzATP, C3 transferase, cerebral edema, neurovascular unit, perivascular astrocytes, neuroprotection, collagenase-induced hemorrhage
MeSH terms
Cadherin 5, Adenosine Triphosphate, Animals, Blood-Brain Barrier, Brain, Cerebral Hemorrhage, Enzyme Activation, Male, Pyridines, Tetrazoles, Antigens, CD, Cadherins, Gene Expression, Rats, Sprague-Dawley, rhoA GTP-Binding Protein, RNA Interference, RNA, Small Interfering, Gene Knockdown Techniques, Receptors, Purinergic P2X7, Purinergic P2X Receptor Antagonists, Occludin, Zonula Occludens-1 Protein

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