Impairment of odor discrimination and identification is associated with disability progression and gray matter atrophy of the olfactory system in MS.

Impairment of odor discrimination and identification is associated with disability progression and gray matter atrophy of the olfactory system in MS.

Publication date: Mar 21, 2019

Impairment of odor discrimination (D), identification (I), and threshold (T) are characteristic features of multiple sclerosis (MS).

To identify patterns of gray matter concentration (GMC) associated with different qualities of olfactory function.

Olfactory function (T and combined DI score) was measured by Sniffin’ Sticks-Test over 2 years longitudinally, and T1-weighted 3-T magnetic resonance imaging (MRI) was performed in 37 MS patients and 18 matched healthy controls (HCs). Statistical parametric mapping (SPM) was applied to objectively identify changes of voxel-wise-GMC throughout the entire brain volume and to correlate image parameters with odor function.

SPM localized significant GMC decreases in the anterior cingulum as well as temporomesial and frontobasal brain areas of the MS group compared with HCs, and revealed significant correlations between lower DI scores and GMC decreases in the olfactory gyrus, anterior cingulum, temporal regions including the parahippocampus, and putamen. Contrarily, no correlations were found between T and GMC. Patients with disability progression had significantly lower mean temporomesial/putamen GMC (0.782 vs 0.804, p = 0.004) compared to patients without Expanded Disability Status Scale (EDSS) progression.

Impairment of DI, but not T is associated with GM atrophy in brain regions related to olfactory function. Further studies are warranted to investigate DI scores and temporomesial/putamen GMC as biomarkers for disability progression.

Bsteh, G., Steiger, R., Tuovinen, N., Hegen, H., Berek, K., Wurth, S., Auer, M., Di Pauli, F., Gizewski, E.R., Deisenhammer, F., Berger, T., and Scherfler, C. Impairment of odor discrimination and identification is associated with disability progression and gray matter atrophy of the olfactory system in MS. 17570. 2019 Mult Scler.

Concepts Keywords
Atrophy Hippocampus
Biomarkers MRI
Brain Magnetic resonance imaging
Cingulum Cingulum
Disability Olfaction
Discrimination Odor
GMC Olfactory system
Gray Matter Putamen
Gyrus Brain
Magnetic Resonance Imaging Limbic system
MRI MRI Multiple sclerosis
Multiple Sclerosis MS
Olfactory Magnetic resonance imaging
Olfactory Function
Olfactory System
Parahippocampus
Putamen
Test
Voxel

Semantics

Type Source Name
gene UNIPROT HLCS
gene UNIPROT CYCS
gene UNIPROT CYREN
disease DOID multiple sclerosis
disease MESH multiple sclerosis
disease MESH atrophy

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