Cited by 507Multiple Sclerosis Research StudiesNeutrophil, Myeloperoxidase and Oxidative MechanismsRedox biology and oxidative stress

NADPH oxidase expression in active multiple sclerosis lesions in relation to oxidative tissue damage and mitochondrial injury

Open access
Fischer, Marie T., Sharma, Rakhi, Lim, Jamie L., Haider, Lukas, Frischer, Josa M., Drexhage, Joost, Mahad, Don, Bradl, Monika +2 more·2012·Brain

Abstract

Multiple sclerosis is a chronic inflammatory disease of the central nervous system, associated with demyelination and neurodegeneration. The mechanisms of tissue injury are poorly understood, but recent data suggest that mitochondrial injury may play an important role in this process. Mitochondrial injury can be triggered by reactive oxygen and nitric oxide species, and we recently provided evidence for oxidative damage of oligodendrocytes and dystrophic axons in early stages of active multiple sclerosis lesions. In this study, we identified potential sources of reactive oxygen and nitrogen species through gene expression in carefully staged and dissected lesion areas and by immunohistochemical analysis of protein expression. Genome-wide microarrays confirmed mitochondrial injury in active multiple sclerosis lesions, which may serve as an important source of reactive oxygen species. In addition, we found differences in the gene expression levels of various nicotinamide adenine dinucleotide phosphate oxidase subunits between initial multiple sclerosis lesions and control white matter. These results were confirmed at the protein level by means of immunohistochemistry, showing upregulation of the subunits gp91phox, p22phox, p47phox, nicotinamide adenine dinucleotide phosphate oxidase 1 and nicotinamide adenine dinucleotide phosphate oxidase organizer 1 in activated microglia in classical active as well as slowly expanding lesions. The subunits gp91phox and p22phox were constitutively expressed in microglia and were upregulated in the initial lesion. In contrast, p47phox, nicotinamide adenine dinucleotide phosphate oxidase 1 and nicotinamide adenine dinucleotide phosphate oxidase organizer 1 expression were more restricted to the zone of initial damage or to lesions from patients with acute or early relapsing/remitting multiple sclerosis. Double labelling showed co-expression of the nicotinamide adenine dinucleotide phosphate oxidase subunits in activated microglia and infiltrated macrophages, suggesting the assembly of functional complexes. Our data suggest that the inflammation-associated oxidative burst in activated microglia and macrophages plays an important role in demyelination and free radical-mediated tissue injury in the pathogenesis of multiple sclerosis.

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Integrity signals

Registry

Crossref · 10.1093/brain/aws012

Cites

69 of 69 references verified0 citation errors · 0 not checkable

Statistics

Claims the paper makes

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

  • Activated microglia express ROS-generating enzymes such as NADPH oxidase, which are responsible for degeneration of oligodendrocytes and increased BBB permeability by downregulating expression of VE-cadherin, occludin and claudin-5 proteins in microvascular endothelial cells.

    “Activated microglia are known to express ROS-generating enzymes, such as NADPH oxidase, which are responsible for degeneration of oligodendrocytes and increased BBB permeability by downregulating the expression of VE-cadherin, occludin and claudin-5 proteins in microvascular ECs (Fischer et al., 2012; Rochfort et al., 2014).”

    From The impact of microglial activation on blood-brain barrier in brain diseases (2014) · cites this paper as Fischer et al., 2012

Self-check

Percentages, sums and reported differences re-computed from the paper’s own numbers.

The self-check needs the paper’s full text.

Cites

Flagged first, then by citations

Cited by

Sorted by citations

Authors
Fischer, M. T., Sharma, R., Lim, J. L., Haider, L., Frischer, J. M., Drexhage, J., Mahad, D., Bradl, M., van Horssen, J., & Lassmann, H.
Affiliations
  • Medical University of Vienna (AT)
  • Amsterdam UMC Location Vrije Universiteit Amsterdam (NL)
  • Newcastle University (GB)
Corresponding author
Lassmann, Hans
Venue
Brain
Published
2012-02-24
Volume
135
Issue
3
Pages
886-899
ISSN
  • 0006-8950 (ISSN-L)
  • 1460-2156
OpenAlex
W2160427694
Cited by
507
References
69
Citations by year
2026: 27 · 2025: 28 · 2024: 31 · 2023: 27 · 2022: 26 · 2021: 41 · 2020: 46 · 2019: 39 · 2018: 34 · 2017: 48 · 2016: 43 · 2015: 39 · 2014: 36 · 2013: 30 · 2012: 12
FWCI
26.99
Type
journal article
Language
en
Open access
Licence
cc-by-nc
Locations
  • Brain (publishedVersion, cc-by-nc)
  • PubMed Central (publishedVersion, cc-by-nc)
  • PubMed (publishedVersion)
  • Amsterdam UMC (VU Amsterdam) - Institutional Repository (publishedVersion)
  • Edinburgh Research Explorer (University of Edinburgh) (submittedVersion, other-oa)
  • Digital Academic REpository of VU University Amsterdam (Vrije Universiteit Amsterdam) (submittedVersion)
  • Pure Amsterdam UMC (submittedVersion)
  • Data Archiving and Networked Services (DANS) (submittedVersion)
  • Data Archiving and Networked Services (DANS) (submittedVersion, other-oa)
Funders
  • National Multiple Sclerosis Society
  • Multiple Sclerosis Society
  • Austrian Science Fund (P24245, P 19854)
Topics
  • Health Sciences › Medicine › Pathology and Forensic Medicine › Multiple Sclerosis Research Studies
  • Life Sciences › Immunology and Microbiology › Immunology › Neutrophil, Myeloperoxidase and Oxidative Mechanisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Redox biology and oxidative stress
Keywords
multiple sclerosis, NADPH oxidase, oxidative stress, mitochondrial injury, reactive oxygen species, reactive nitrogen species, microglia, macrophages, gp91phox, p22phox, p47phox, NOX1, demyelination, neurodegeneration, oligodendrocyte damage, axonal dystrophy, respiratory burst, relapsing-remitting multiple sclerosis
MeSH terms
NADPH Oxidase 1, NADPH Oxidase 2, Adult, Aged, Aged, 80 and over, Demyelinating Diseases, DNA, Mitochondrial, Female, Humans, Immunohistochemistry, Macrophages, Male, Membrane Glycoproteins, Middle Aged, Mitochondria, Multiple Sclerosis, Nerve Degeneration, RNA, Blotting, Western, RNA, Antisense, Respiratory Burst, Reactive Oxygen Species, Microglia, Oxidative Stress, NADPH Oxidases, Microarray Analysis, Genome-Wide Association Study

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

Are you an author, or do you see a problem with this page? Request a review