Innate immune cells and myelin profile in multiple sclerosis: a multi-tracer PET/MR study
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Citações na Scopus
4
Tipo de produção
article
Data de publicação
2022
Título da Revista
ISSN da Revista
Título do Volume
Editora
SPRINGER
Citação
EUROPEAN JOURNAL OF NUCLEAR MEDICINE AND MOLECULAR IMAGING, v.49, n.13, p.4551-4566, 2022
Resumo
Purpose Neuropathological studies have demonstrated distinct profiles of microglia activation and myelin injury among different multiple sclerosis (MS) phenotypes and disability stages. PET imaging using specific tracers may uncover the in vivo molecular pathology and broaden the understanding of the disease heterogeneity. Methods We used the 18-kDa translocator protein (TSPO) tracer (R)[C-11]PK11195 and [C-11]PIB PET images acquired in a hybrid PET/MR 3 T system to characterize, respectively, the profile of innate immune cells and myelin content in 47 patients with MS compared to 18 healthy controls (HC). For the volume of interest (VOI)-based analysis of the dynamic data, (R)[C-11]PK11195 distribution volume (VT) was determined for each subject using a metabolite-corrected arterial plasma input function while [C-11]PIB distribution volume ratio (DVR) was estimated using a reference region extracted by a supervised clustering algorithm. A voxel-based analysis was also performed using Statistical Parametric Mapping. Functional disability was evaluated by the Expanded Disability Status Scale (EDSS), Multiple Sclerosis Functional Composite (MSFC), and Symbol Digit Modality Test (SDMT). Results In the VOI-based analysis, [C-11]PIB DVR differed between patients and HC in the corpus callosum (P = 0.019) while no differences in (R)-[C-11]PK11195 V-T were observed in patients relative to HC. Furthermore, no correlations or associations were observed between both tracers within the VOI analyzed. In the voxel-based analysis, high (R)-[C-11]PK11195 uptake was observed diffusively in the white matter (WM) when comparing the progressive phenotype and HC, and lower [C-11]PIB uptake was observed in certain WM regions when comparing the relapsing-remitting phenotype and HC. None of the tracers were able to differentiate phenotypes at voxel or VOI level in our cohort. Linear regression models adjusted for age, sex, and phenotype demonstrated that higher EDSS was associated with an increased (R)-[C-11]PK11195 V-T and lower [C-11]PIB DVR in corpus callosum (P = 0.001; P = 0.023), caudate (P = 0.015; P = 0.008), and total T-2 lesion (P = 0.007; P = 0.012), while better cognitive scores in SDMT were associated with higher [C-11]PIB DVR in the corpus callosum (P = 0.001), and lower (R)-[C-11]PK11195 V-T (P = 0.013). Conclusions Widespread innate immune cells profile and marked loss of myelin in T-2 lesions and regions close to the ventricles may occur independently and are associated with disability, in both WM and GM structures.
Palavras-chave
PET imaging, TSPO, Myelin, Multiple sclerosis, Disability
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Artigos e Materiais de Revistas Científicas - FM/MDR
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Artigos e Materiais de Revistas Científicas - LIM/43
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Artigos e Materiais de Revistas Científicas - HC/ICHC
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Artigos e Materiais de Revistas Científicas - LIM/43