Cited by 199Multiple Sclerosis Research StudiesAdvanced MRI Techniques and ApplicationsNeuroinflammation and Neurodegeneration Mechanisms

The DOI matches its Crossref record; 63 of the 63 references it cites were found in a registry or an index.

Quantitative susceptibility mapping identifies inflammation in a subset of chronic multiple sclerosis lesions

Open access

Abstract

Chronic active multiple sclerosis lesions, characterized by a hyperintense rim of iron-enriched, activated microglia and macrophages, have been linked to greater tissue damage. Post-mortem studies have determined that chronic active lesions are primarily related to the later stages of multiple sclerosis; however, the occurrence of these lesions, and their relationship to earlier disease stages may be greatly underestimated. Detection of chronic active lesions across the patient spectrum of multiple sclerosis requires a validated imaging tool to accurately identify lesions with persistent inflammation. Quantitative susceptibility mapping provides efficient in vivo quantification of susceptibility changes related to iron deposition and the potential to identify lesions harbouring iron-laden inflammatory cells. The PET tracer 11C-PK11195 targets the translocator protein expressed by activated microglia and infiltrating macrophages. Accordingly, this study aimed to validate that lesions with a hyperintense rim on quantitative susceptibility mapping from both relapsing and progressive patients demonstrate a higher level of innate immune activation as measured on 11C-PK11195 PET. Thirty patients were enrolled in this study, 24 patients had relapsing remitting multiple sclerosis, six had progressive multiple sclerosis, and all patients had concomitant MRI with a gradient echo sequence and PET with 11C-PK11195. A total of 406 chronic lesions were detected, and 43 chronic lesions with a hyperintense rim on quantitative susceptibility mapping were identified as rim+ lesions. Susceptibility (relative to CSF) was higher in rim+ (2.42 ± 17.45 ppb) compared to rim- lesions (-14.6 ± 19.3 ppb, P < 0.0001). Among rim+ lesions, susceptibility within the rim (20.04 ± 14.28 ppb) was significantly higher compared to the core (-5.49 ± 14.44 ppb, P < 0.0001), consistent with the presence of iron. In a mixed-effects model, 11C-PK11195 uptake, representing activated microglia/macrophages, was higher in rim+ lesions compared to rim- lesions (P = 0.015). Validating our in vivo imaging results, multiple sclerosis brain slabs were imaged with quantitative susceptibility mapping and processed for immunohistochemistry. These results showed a positive translocator protein signal throughout the expansive hyperintense border of rim+ lesions, which co-localized with iron containing CD68+ microglia and macrophages. In conclusion, this study provides evidence that suggests that a hyperintense rim on quantitative susceptibility measure within a chronic lesion is a correlate for persistent inflammatory activity and that these lesions can be identified in the relapsing patients. Utilizing quantitative susceptibility measure to differentiate chronic multiple sclerosis lesion subtypes, especially chronic active lesions, would provide a method to assess the impact of these lesions on disease progression.

Overview

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/awy296

Cites

63 of 63 references verified0 citation errors · 0 not checkable

Statistics

Verification

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?

Self-check

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

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

Citations

Cites

Show all 63 references

Cited by

Sorted by citations

Metadata

Authors
Kaunzner, U. W., Kang, Y., Zhang, S., Morris, E., Yao, Y., Pandya, S., Hurtado Rua, S. M., Park, C., Gillen, K. M., Nguyen, T. D., Wang, Y., Pitt, D., & Gauthier, S. A.
Affiliations
  • Weill Cornell Medicine (US)
  • Cornell MRI Research Lab, New York City, NY, USA
  • Department of Mathematics, College of Sciences and Health Professions, Cleveland State University, Cleveland, OH, USA
  • Yale University (US)
Corresponding author
Gauthier, Susan A
Venue
Brain
Published
2018-12-15
Volume
142
Issue
1
Pages
133-145
ISSN
  • 0006-8950 (ISSN-L)
  • 1460-2156
OpenAlex
W2904004727
Cited by
199
References
63
Citations by year
2026: 15 · 2025: 20 · 2024: 40 · 2023: 27 · 2022: 33 · 2021: 30 · 2020: 23 · 2019: 11
FWCI
12.17
Type
journal article
Language
en
Open access
Locations
  • Brain (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • EngagedScholarship @ Cleveland State University (Cleveland State University) (submittedVersion)
Funders
  • National Institutes of Health (RO1 NS090464)
  • Biogen (55000025)
  • Genzyme (56585757)
  • Novartis (56585786, UL1 TR000456-06)
  • Weill Cornell Clinical and Translational Science Center
Topics
  • Health Sciences › Medicine › Clinical Neurology › Multiple Sclerosis Research Studies
  • Health Sciences › Medicine › Radiology, Nuclear Medicine and Imaging › Advanced MRI Techniques and Applications
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
Keywords
chronic active lesions, quantitative susceptibility mapping, [11C]PK11195, translocator protein (TSPO), microglial activation, macrophages, iron accumulation, innate immune activation, relapsing-remitting multiple sclerosis, progressive multiple sclerosis, CD68, immunohistochemistry
MeSH terms
CD68 Molecule, Adult, Aged, Brain, Carbon Radioisotopes, Chronic Disease, Cross-Sectional Studies, Female, Humans, Inflammation, Iron, Isoquinolines, Macrophages, Magnetic Resonance Imaging, Male, Middle Aged, Multiple Sclerosis, Retrospective Studies, Antigens, Differentiation, Myelomonocytic, Antigens, CD, Microglia, Positron-Emission Tomography, Young Adult

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