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Investigation of sex-specific effects of apolipoprotein E on severity of EAE and MS. J Neuroinflammation 2015 Dec 16;12:234 PMID: 26669675 PMCID: PMC4681148

Abstract

BACKGROUND: Despite pleiotropic immunomodulatory effects of apolipoprotein E (apoE) in vitro, its effects on the clinical course of experimental autoimmune encephalomyelitis (EAE) and multiple sclerosis (MS) are still controversial. As sex hormones modify immunomodulatory apoE functions, they may explain contentious findings. This study aimed to investigate sex-specific effects of apoE on disease course of EAE and MS.

METHODS: MOG(35-55) induced EAE in female and male apoE-deficient mice was assessed clinically and histopathologically. apoE expression was investigated by qPCR. The association of the MS severity score (MSSS) and APOE rs429358 and rs7412 was assessed across 3237 MS patients using linear regression analyses.

RESULTS: EAE disease course was slightly attenuated in male apoE-deficient (apoE (-/-) ) mice compared to wildtype mice (cumulative median score: apoE (-/-)  = 2 [IQR 0.0-4.5]; wildtype = 4 [IQR 1.0-5.0]; n = 10 each group, p = 0.0002). In contrast, EAE was more severe in female apoE (-/-) mice compared to wildtype mice (cumulative median score: apoE (-/-)  = 3 [IQR 2.0-4.5]; wildtype = 3 [IQR 0.0-4.0]; n = 10, p = 0.003). In wildtype animals, apoE expression during the chronic EAE phase was increased in both females and males (in comparison to naïve animals; p < 0.001). However, in MS, we did not observe a significant association between MSSS and rs429358 or rs7412, neither in the overall analyses nor upon stratification for sex.

CONCLUSIONS: apoE exerts moderate sex-specific effects on EAE severity. However, the results in the apoE knock-out model are not comparable to effects of polymorphic variants in the human APOE gene, thus pinpointing the challenge of translating findings from the EAE model to the human disease.

Author List

Schrewe L, Lill CM, Liu T, Salmen A, Gerdes LA, Guillot-Noel L, Akkad DA, Blaschke P, Graetz C, Hoffjan S, Kroner A, Demir S, Böhme A, Rieckmann P, ElAli A, Hagemann N, Hermann DM, Cournu-Rebeix I, Zipp F, Kümpfel T, Buttmann M, Zettl UK, Fontaine B, Bertram L, Gold R, Chan A

Author

Antje Kroner-Milsch MD, PhD Assistant Professor in the Neurosurgery department at Medical College of Wisconsin

MESH terms used to index this publication - Major topics in bold

Animals
Apolipoproteins E
Encephalomyelitis, Autoimmune, Experimental
Female
Fluorescent Antibody Technique
Genotype
Humans
Male
Mice
Mice, Inbred C57BL
Mice, Knockout
Multiple Sclerosis
Sex Factors



View this publication's entry at the Pubmed website PMID: 26669675
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