Cited by 225Barrier Structure and Function StudiesAcute Ischemic Stroke ManagementNeuroinflammation and Neurodegeneration Mechanisms

The neurovascular unit as a selective barrier to polymorphonuclear granulocyte (PMN) infiltration into the brain after ischemic injury

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Enzmann, Gaby, Mysiorek, Caroline, Gorina, Roser, Cheng, Yu-Jung, Ghavampour, Sharang, Hannocks, Melanie-Jane, Prinz, Vincent, Dirnagl, Ulrich +7 more·2013·Acta Neuropathologica

Abstract

The migration of polymorphonuclear granulocytes (PMN) into the brain parenchyma and release of their abundant proteases are considered the main causes of neuronal cell death and reperfusion injury following ischemia. Yet, therapies targeting PMN egress have been largely ineffective. To address this discrepancy we investigated the temporo-spatial localization of PMNs early after transient ischemia in a murine transient middle cerebral artery occlusion (tMCAO) model and human stroke specimens. Using specific markers that distinguish PMN (Ly6G) from monocytes/macrophages (Ly6C) and that define the cellular and basement membrane boundaries of the neurovascular unit (NVU), histology and confocal microscopy revealed that virtually no PMNs entered the infarcted CNS parenchyma. Regardless of tMCAO duration, PMNs were mainly restricted to luminal surfaces or perivascular spaces of cerebral vessels. Vascular PMN accumulation showed no spatial correlation with increased vessel permeability, enhanced expression of endothelial cell adhesion molecules, platelet aggregation or release of neutrophil extracellular traps. Live cell imaging studies confirmed that oxygen and glucose deprivation followed by reoxygenation fail to induce PMN migration across a brain endothelial monolayer under flow conditions in vitro. The absence of PMN infiltration in infarcted brain tissues was corroborated in 25 human stroke specimens collected at early time points after infarction. Our observations identify the NVU rather than the brain parenchyma as the site of PMN action after CNS ischemia and suggest reappraisal of targets for therapies to reduce reperfusion injury after stroke.

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Crossref · 10.1007/s00401-012-1076-3

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  • These neutrophils become confined by the astrocytic basement membrane and glia limitans to the perivascular space.

    “However, these cells become confined by the astrocytic basement membrane and glia limitans to the perivascular space (143, 144).”
  • Neuroinflammation is a key component of cell death cascades in stroke, with microglial cells and peripheral leukocytes, especially neutrophils and monocytes/macrophages, as main players.

    “One of the key components of the cell death cascades in stroke is neuroinflammation, where the main players are microglial cells and the peripheral leukocytes, especially neutrophils and monocytes/macrophages.”

    From The impact of microglial activation on blood-brain barrier in brain diseases (2014) · cites this paper as Enzmann et al., 2013

  • After ischemic insult, recruitment of immune cells occurs in a biphasic dynamics: in the acute phase (within minutes), microglial cells are rapidly recruited to the injury site due to immediate release of cytokines and chemokines.

    “After the ischemic insult, the recruitment of immune cells occurs in a biphasic dynamics. In the acute phase (within minutes), microglial cells are rapidly recruited to the injury site, due to the immediate release of cytokines and chemokines.”

    From The impact of microglial activation on blood-brain barrier in brain diseases (2014) · cites this paper as Enzmann et al., 2013

  • In the acute phase, activated microglia enhance release of ROS (through NADPH oxidase and MPO), cytokines (IL-1β, IL-6, TNF-α) and chemokines (MCP-1, CXCL-1, MIP-1α).

    “These cells are activated, enhancing the release of ROS (through NADPH oxidase and MPO), cytokines (i.e., IL-1β, IL-6 and TNF-α) and chemokines (MCP-1, CXCL-1 and MIP-1α).”

    From The impact of microglial activation on blood-brain barrier in brain diseases (2014) · cites this paper as Enzmann et al., 2013

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  1. [40]Glaser JS Neuro-ophthalmology 1999 Philadelphia Lippincott Williams & Wilkins

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Authors
Enzmann, G., Mysiorek, C., Gorina, R., Cheng, Y.-J., Ghavampour, S., Hannocks, M.-J., Prinz, V., Dirnagl, U., Endres, M., Prinz, M., Beschorner, R., Harter, P. N., Mittelbronn, M., Engelhardt, B., & Sorokin, L.
Affiliations
  • University of Bern (CH)
  • University of Münster (DE)
  • Center for Stroke Research Berlin (DE)
  • University of Freiburg (DE)
  • University of Tübingen (DE)
  • Goethe University Frankfurt (DE)
Corresponding author
  • Mittelbronn, Michel
  • Engelhardt, Britta
  • Sorokin, Lydia
Venue
Acta Neuropathologica
Published
2012-12-27
Volume
125
Issue
3
Pages
395-412
ISSN
  • 0001-6322 (ISSN-L)
  • 1432-0533
OpenAlex
W2020283277
Cited by
225
References
91
Citations by year
2026: 7 · 2025: 10 · 2024: 13 · 2023: 14 · 2022: 17 · 2021: 23 · 2020: 14 · 2019: 15 · 2018: 24 · 2017: 14 · 2016: 16 · 2015: 20 · 2014: 21 · 2013: 17
FWCI
9.33
Type
journal article
Language
en
Open access
Locations
  • Acta Neuropathologica (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • reroDoc Digital Library (submittedVersion)
  • HAL (submittedVersion)
  • Bern Open Repository and Information System (University of Bern) (submittedVersion, other-oa)
  • Open Access CRIS of the University of Bern
Funders
  • University of Bern
  • European Commission (2007–2013, FP7 2007-2013, FP7/2007, 202213, 201024)
  • Deutsche Forschungsgemeinschaft (FP7/2007–2013, TR 43, SFBTR43)
  • Bundesministerium für Bildung und Forschung
Topics
  • Life Sciences › Neuroscience › Neurology › Barrier Structure and Function Studies
  • Health Sciences › Medicine › Epidemiology › Acute Ischemic Stroke Management
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
Keywords
neurovascular unit, polymorphonuclear leukocytes, neutrophil infiltration, cerebral ischemia, stroke, transient middle cerebral artery occlusion, ischemia-reperfusion injury, Ly6G, Ly6C, perivascular spaces, neutrophil extracellular traps, oxygen-glucose deprivation, brain endothelium, stroke therapy targets
MeSH terms
Animals, Hypoxia, Antigens, Ly, Blood Vessels, Blood-Brain Barrier, Brain, Cells, Cultured, Disease Models, Animal, Endothelium, Gene Expression Regulation, Glucose, Granulocytes, Humans, Functional Laterality, Male, Mice, Inbred C57BL, Models, Biological, Oxygen, Antigens, CD, Cell Adhesion Molecules, Infarction, Middle Cerebral Artery, Mice

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