scholarly journals Pittsburgh compound-B PET white matter imaging and cognitive function in late multiple sclerosis

2017 ◽  
Vol 24 (6) ◽  
pp. 739-749 ◽  
Author(s):  
Burcu Zeydan ◽  
Val J Lowe ◽  
Christopher G Schwarz ◽  
Scott A Przybelski ◽  
Nirubol Tosakulwong ◽  
...  
Keyword(s):  
Multiple Sclerosis ◽  
Cognitive Function ◽  
White Matter ◽  
Conditional Logistic Regression ◽  
Standardized Uptake Value ◽  
Population Based ◽  
Large Network ◽  
Pittsburgh Compound B ◽  
Normal Appearing White Matter ◽  
Positron Emission

Background: There is growing interest in white matter (WM) imaging with positron emission tomography (PET). Objectives: We studied the association of cognitive function in late multiple sclerosis (MS) with cortical and WM Pittsburgh compound-B PET (PiB-PET) binding. Methods: In the population-based Mayo Clinic Study of Aging, 24 of 4869 participants had MS (12 underwent PiB-PET). Controls were age and sex matched (5:1). We used automated or semi-automated processing for quantitative image analyses and conditional logistic regression for group differences. Results: MS patients had lower memory ( p = 0.03) and language ( p = 0.02) performance; smaller thalamic volumes ( p = 0.003); and thinner temporal ( p = 0.001) and frontal ( p = 0.045) cortices on magnetic resonance imaging (MRI) than controls. There was no difference in global cortical PiB standardized uptake value ratios between MS and controls ( p = 0.35). PiB uptake was lower in areas of WM hyperintensities compared to normal-appearing white matter (NAWM) in MS ( p = 0.0002). Reduced PiB uptake in both the areas of WM hyperintensities ( r = 0.65; p = 0.02) and NAWM ( r = 0.69; p = 0.01) was associated with decreased visuospatial performance in MS. Conclusion: PiB uptake in the cortex in late MS is not different from normal age-matched controls. PiB uptake in the WM in late MS may be a marker of the large network structures’ integrity such as those involved in visuospatial performance.

scholarly journals A tractometry investigation of white matter tract network structure and relationships with cognitive function in relapsing-remitting multiple sclerosis

2021 ◽  
Author(s):  
Danka Jandric ◽  
Geoff JM Parker ◽  
Hamied Haroon ◽  
Valentina Tomassini ◽  
Nils Muhlert ◽  
...  
Keyword(s):  
Multiple Sclerosis ◽  
Cognitive Function ◽  
White Matter ◽  
Cognitive Dysfunction ◽  
Network Structure ◽  
Test Performance ◽  
Cognitive Domains ◽  
Normal Appearing White Matter ◽  
Relapsing Remitting ◽  
The Brain

Understanding the brain changes underlying cognitive dysfunction is a key priority in multiple sclerosis to improve monitoring and treatment of this debilitating symptom. Functional connectivity network changes are associated with cognitive dysfunction, but it is less well understood how changes in normal appearing white matter relate to cognitive symptoms. If white matter tracts share a similar network structure it would be expected that tracts within a network are similarly affected by MS pathology. In the present study, we used a tractometry approach to explore patterns of variance in diffusion metrics across white matter (WM) tracts. We investigated whether separate networks, based on normal variation or pathology, appear, and how this relates to neuropsychological test performance across cognitive domains. A sample of 102 relapsing-remitting MS patients and 27 healthy controls underwent MRI and neuropsychological testing. Tractography was performed on diffusion MRI data to extract 40 WM tracts and microstructural measures were extracted from each tract. Principal component analysis (PCA) was used to decompose metrics from all tracts to assess the presence of any co-variance structure among the tracts. Similarly, PCA was applied to cognitive test scores to identify the main cognitive domains. Finally, we assessed the ability of tract components to predict test performance across cognitive domains. We found that a single component which captured pathology across all tracts explained the most variance and that there was little evidence for separate, smaller network patterns of pathology. WM tract components were weak, but significant, predictors of cognitive function in MS. These findings highlight the need to investigate the relationship between the normal appearing white matter and cognitive impairment further and on a more granular level, to improve the understanding of the network structure of the brain in MS.

Pittsburgh compound B and other amyloid positron emission tomography tracers for the study of white matter and multiple sclerosis

2016 ◽  
Vol 80 (1) ◽  
pp. 166-166 ◽  
Author(s):  
Jordi A. Matías-Guiu ◽  
María Nieves Cabrera-Martín ◽  
Celia Oreja-Guevara ◽  
José Luis Carreras ◽  
Jorge Matías-Guiu
Keyword(s):  
Multiple Sclerosis ◽  
Positron Emission Tomography ◽  
White Matter ◽  
Emission Tomography ◽  
Pittsburgh Compound B ◽  
Amyloid Positron Emission Tomography ◽  
Positron Emission

NODDI discloses early changes in the normal appearing white matter in paediatric multiple sclerosis

2021 ◽  
Vol 429 ◽  
pp. 118881
Author(s):  
Monica Margoni ◽  
Umberto Villani ◽  
Silvia Franciotta ◽  
Martina Rubin ◽  
Margherita Nosadini ◽  
...  
Keyword(s):  
Multiple Sclerosis ◽  
White Matter ◽  
Normal Appearing White Matter ◽  
Paediatric Multiple Sclerosis

scholarly journals A higher proportion of ermin-immunopositive oligodendrocytes in areas of remyelination

PLoS ONE ◽  
2021 ◽  
Vol 16 (8) ◽  
pp. e0256155
Author(s):  
Intakhar Ahmad ◽  
Stig Wergeland ◽  
Eystein Oveland ◽  
Lars Bø
Keyword(s):  
Multiple Sclerosis ◽  
White Matter ◽  
Corpus Callosum ◽  
Mouse Model ◽  
Grey Matter ◽  
Early Stage ◽  
Relative Proportion ◽  
Normal Appearing White Matter ◽  
The Brain

Incomplete remyelination is frequent in multiple sclerosis (MS)-lesions, but there is no established marker for recent remyelination. We investigated the role of the oligodendrocyte/myelin protein ermin in de- and remyelination in the cuprizone (CPZ) mouse model, and in MS. The density of ermin+ oligodendrocytes in the brain was significantly decreased after one week of CPZ exposure (p < 0.02). The relative proportion of ermin+ cells compared to cells positive for the late-stage oligodendrocyte marker Nogo-A increased at the onset of remyelination in the corpus callosum (p < 0.02). The density of ermin-positive cells increased in the corpus callosum during the CPZ-phase of extensive remyelination (p < 0.0001). In MS, the density of ermin+ cells was higher in remyelinated lesion areas compared to non-remyelinated areas both in white- (p < 0.0001) and grey matter (p < 0.0001) and compared to normal-appearing white matter (p < 0.001). Ermin immunopositive cells in MS-lesions were not immunopositive for the early-stage oligodendrocyte markers O4 and O1, but a subpopulation was immunopositive for Nogo-A. The data suggest a relatively higher proportion of ermin immunopositivity in oligodendrocytes compared to Nogo-A indicates recent or ongoing remyelination.

Normal-appearing white matter changes in multiple sclerosis: the contribution of magnetic resonance techniques

1999 ◽  
Vol 5 (4) ◽  
pp. 273-282 ◽  
Author(s):  
Massimo Filippi ◽  
Carla Tortorella ◽  
Marco Bozzali
Keyword(s):  
Multiple Sclerosis ◽  
White Matter ◽  
Magnetic Resonance ◽  
Clinical Manifestations ◽  
Present Knowledge ◽  
Pathological Changes ◽  
White Matter Changes ◽  
Disease Evolution ◽  
Normal Appearing White Matter ◽  
Neurological Conditions

Several magnetic resonance (MR) techniques have proved to be sensitive enough to detect the subtle pathological changes that post-mortem studies showed to occur in the normal-appearing white matter (NAWM) from patients with multiple sclerosis (MS). Although these abnormalities can be detected in other neurological conditions, they seem to be more frequent and diffuse in MS. However, the contribution of NAWM changes to the diagnosis is still unclear. Their nature is also unknown and perhaps differs in different phases and clinical manifestations of the disease. Nevertheless, the extent and severity of NAWM damage seems to be relevant in causing disability and influencing the clinical evolution in MS patients. This review will summarize the present knowledge about MR-detected NAWM changes in MS and their relevance to the diagnosis and the understanding of disease evolution.

Overexpression of sphingosine-1-phosphate receptors on reactive astrocytes drives neuropathology of multiple sclerosis rebound after fingolimod discontinuation

2018 ◽  
Vol 24 (8) ◽  
pp. 1133-1137 ◽  
Author(s):  
Maria Teresa Giordana ◽  
Paola Cavalla ◽  
Antonio Uccelli ◽  
Alice Laroni ◽  
Fabio Bandini ◽  
...  
Keyword(s):  
Multiple Sclerosis ◽  
White Matter ◽  
Disease Activity ◽  
Multiple Sclerosis Patient ◽  
Fatal Outcome ◽  
Reactive Astrocytes ◽  
Normal Appearing White Matter ◽  
Sphingosine 1 Phosphate ◽  
Demyelinating Lesions

We present the neuropathological description of an autoptic case of fatal rebound of disease activity after fingolimod discontinuation in a multiple sclerosis patient. MRI prior to the fatal outcome showed several large tumefactive demyelinating lesions. These lesions were characterized by prominent astrocytic gliosis, with a remarkable preponderance of large hypertrophic reactive astrocytes showing intense expression of sphingosine-1-phosphate receptor 1. Prominent astrocytic gliosis was also diffusely observed in the normal-appearing white matter. Dysregulated sphingosine-1-phosphate signaling on astrocytes following fingolimod withdrawal might represent a possible contributing mechanism to disease rebound and might account for the unusual radiological and neuropathological features observed in the present case.

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