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Clinical Reviews in Allergy & Immunology
Erschienen in: Clinical Reviews in Allergy & Immunology 1/2017

06.06.2016

Thymic Germinal Centers and Corticosteroids in Myasthenia Gravis: an Immunopathological Study in 1035 Cases and a Critical Review

verfasst von: Frédérique Truffault, Vincent de Montpreville, Bruno Eymard, Tarek Sharshar, Rozen Le Panse, Sonia Berrih-Aknin

Erschienen in: Clinical Reviews in Allergy & Immunology | Ausgabe 1/2017

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Abstract

The most common form of Myasthenia gravis (MG) is due to anti-acetylcholine receptor (AChR) antibodies and is frequently associated with thymic pathology. In this review, we discuss the immunopathological characteristics and molecular mechanisms of thymic follicular hyperplasia, the effects of corticosteroids on this thymic pathology, and the role of thymic epithelial cells (TEC), a key player in the inflammatory thymic mechanisms. This review is based not only on the literature data but also on thymic transcriptome results and analyses of pathological and immunological correlations in a vast cohort of 1035 MG patients without thymoma. We show that among patients presenting a thymic hyperplasia with germinal centers (GC), 80 % are females, indicating that thymic follicular hyperplasia is mainly a disease of women. The presence of anti-AChR antibodies is correlated with the degree of follicular hyperplasia, suggesting that the thymus is a source of anti-AChR antibodies. The degree of hyperplasia is not dependent upon the time from the onset, implying that either the antigen is chronically expressed and/or that the mechanisms of the resolution of the GC are not efficiently controlled. Glucocorticoids, a conventional therapy in MG, induce a significant reduction in the GC number, together with changes in the expression of chemokines and angiogenesis. These changes are likely related to the acetylation molecular process, overrepresented in corticosteroid-treated patients, and essential for gene regulation. Altogether, based on the pathological and molecular thymic abnormalities found in MG patients, this review provides some explanations for the benefit of thymectomy in early-onset MG patients.
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Metadaten
Titel
Thymic Germinal Centers and Corticosteroids in Myasthenia Gravis: an Immunopathological Study in 1035 Cases and a Critical Review
verfasst von
Frédérique Truffault
Vincent de Montpreville
Bruno Eymard
Tarek Sharshar
Rozen Le Panse
Sonia Berrih-Aknin
Publikationsdatum
06.06.2016
Verlag
Springer US
Erschienen in
Clinical Reviews in Allergy & Immunology / Ausgabe 1/2017
Print ISSN: 1080-0549
Elektronische ISSN: 1559-0267
DOI
https://doi.org/10.1007/s12016-016-8558-3

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