Evidence map›Paper›PMID 21437933›Full record

ArticleAnnals of neurology2011

Repetitive hypoxia extends endogenous neurovascular protection for stroke.

Ann M Stowe, Tamer Altay, Angela B Freie, Jeffrey M Gidday

Abstract read
In one paragraph

Article in Annals of neurology, 2011. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 74 papers.

0numbers the graph read from it
0cells of the map it votes in
74citing papers in PubMed
7.7field-weighted citation impact, top 3% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

74 citing papers in PubMed, 118 citations in OpenAlex.

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  8. Intermittent hypoxia protects against hypoxic-ischemic brain damage by inducing functional angiogenesis.Journal of cerebral blood flow and metabolism : official journal of the International Society of Cerebral Blood Flow and Metabolism · 2023
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14 more citing papers are in PubMed but not listed here.

4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

4 authors at 2 institutions in 1 country.

Ann M StoweDepartment of Neurological Surgery, Washington University School of Medicine, St Louis, MO 63110, USA.
Tamer Altay
Angela B Freie
Jeffrey M Gidday
Neurological Surgery · USWashington University in St. Louis · US

Funding

ZINC AND ISCHEMIC BRAIN INJURYP01NS032636 · NINDS · WASHINGTON UNIVERSITY · PI GOLDBERG, MARK PAUL · 1995 to 2010
$13.2M
Washington University Center for Translational NeuroscienceP30NS057105 · NINDS · WASHINGTON UNIVERSITY · PI HOLTZMAN, DAVID M. · 2006 to 2011
$8.7M
Vascular Mechanisms of Cerebral Ischemic ToleranceR01HL079278 · NHLBI · WASHINGTON UNIVERSITY · PI GIDDAY, JEFFREY M · 2005 to 2008
$1.6M
EPISODIC HYPOXIA AND ACUTE CEREBROVASCULAR INFLAMMATIONR01HL066360 · NHLBI · WASHINGTON UNIVERSITY · PI GIDDAY, JEFFREY M · 2000 to 2003
$988k
NHLBI NIH HHS R01 HL066360NHLBI NIH HHS R01 HL079278NINDS NIH HHS P01 NS032636NINDS NIH HHS P30 NS057105PHS HHS P01 NINDS32636PHS HHS P30 NINDS057105PHS HHS R01 NHLBI79278
6 · The paper itself

Abstract

objectiveBrief systemic hypoxia protects the rodent brain from subsequent ischemic injury, although the protection wanes within days. We hypothesized that the duration of ischemic tolerance could be extended from days to months by repeated intermittent hypoxia of varying magnitude and duration.

methodsInfarction volumes following a 60-minute transient middle cerebral artery occlusion were determined in adult male mice 2 days through 8 weeks after completion of a 2-week repetitive hypoxic preconditioning (RHP) protocol. Separate cohorts were studied for the protective effects of RHP on postischemic and cytokine-induced cerebrovascular inflammation, and for potential deleterious effects of the RHP stimulus itself.

resultsRHP protection against transient focal stroke persisted for 8 weeks. Leukocyte adherence to cortical venules was attenuated in response to stroke, as well as following tumor necrosis factor-α administration, indicating that reductions in postischemic inflammation were not secondary to smaller infarct volumes. RHP reduced poststroke leukocyte diapedesis concomitant with a long-lasting downregulation of endothelial adhesion molecule mRNAs, and also reduced postischemic blood--brain barrier permeability to endogenous immunoglobulin G. RHP was without effect on hippocampal CA1 pyramidal cell viability, only transiently elevated hematocrit, and did not affect the magnitude of cerebral blood flow during and after ischemia.

interpretationTaken together, our findings reveal a novel form of epigenetic neurovascular plasticity characterized by a prominent anti-inflammatory phenotype that provides protection against stroke many weeks longer than previously established windows of preconditioning-induced tolerance. Translating these endogenous protective mechanisms into therapeutics could afford sustained periods of cerebroprotection in subpopulations of individuals at identified risk for stroke.

Indexed as

Ischemic PreconditioningAnalysis of VarianceAnimalsBlood-Brain BarrierCerebrovascular CirculationDisease Models, AnimalE-SelectinFunctional LateralityGreen Fluorescent ProteinsHematocritHippocampusInfarction, Middle Cerebral ArteryLeukocytesL-SelectinMaleMiceenhanced green fluorescent proteinE-SelectinGreen Fluorescent ProteinsL-SelectinTumor Necrosis Factor-alphaVascular Cell Adhesion Molecule-1

Identifiers

PMID21437933
PMCPMC3117913
OpenAlexW2015123144

What OpenQuestion holds

Textmetadata
LicenceTDM
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.