Article (Scientific journals)
A coherent organization of differentiation proteins is required to maintain an appropriate thyroid function in the Pendred thyroid.
Senou, Maximin; Khalifa, Celine; Thimmesch, Matthieu et al.
2010In Journal of Clinical Endocrinology and Metabolism, 95 (8), p. 4021-30
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Keywords :
Apoptosis/genetics; Blotting, Western; Cell Proliferation; Chloride Channels/genetics/metabolism; Female; Humans; Immunohistochemistry; Iodide Peroxidase/genetics/metabolism; Membrane Transport Proteins/genetics/metabolism; Middle Aged; NADPH Oxidase/genetics/metabolism; Oxidative Stress/genetics; Reverse Transcriptase Polymerase Chain Reaction; Thyroid Function Tests; Thyroid Gland/metabolism/physiopathology
Abstract :
[en] CONTEXT: Pendred syndrome is caused by mutations in the gene coding for pendrin, an apical Cl-/I- exchanger. OBJECTIVE: To analyze intrathyroidal compensatory mechanisms when pendrin is lacking, we investigated the thyroid of a patient with Pendred syndrome. The expression of proteins involved in thyroid hormone synthesis, markers of oxidative stress (OS), cell proliferation, apoptosis, and antioxidant enzymes were analyzed. RESULTS: Three morphological zones were identified: nearly normal follicles with iodine-rich thyroglobulin in the colloid (zone 1.a), small follicles without iodine-rich thyroglobulin in lumina (zone 1.b), and destroyed follicles (zone 2). In zones 1.a, dual oxidase (Duox) and thyroid peroxidase (TPO) were localized at the apical pole, OS and cell apoptosis were absent, but ClC-5 expression was strongly increased. In zones 1.b, Duox and TPO were aberrantly present and increased in the cytosol and associated with high OS, apoptosis, cell proliferation, and increased expression of peroxiredoxin-5, catalase, and dehalogenase-1 but moderate ClC-5 expression. CONCLUSION: In conclusion, the absence of pendrin is accompanied by increased ClC-5 expression that may transiently compensate for apical iodide efflux. In more affected follicles, Duox and TPO are relocated in the cytosol, leading to abnormal intracellular thyroid hormone synthesis, which results in cell destruction presumably because intracellular OS cannot be buffered by antioxidant defenses.
Disciplines :
Endocrinology, metabolism & nutrition
Author, co-author :
Senou, Maximin
Khalifa, Celine
Thimmesch, Matthieu
JOURET, François  ;  Centre Hospitalier Universitaire de Liège - CHU > Néphrologie
Devuyst, Olivier
Col, Vincent
Audinot, Jean-Nicolas
Lipnik, Pascale
Moreno, Jose C.
Van Sande, Jacqueline
Dumont, Jacques E.
Many, Marie-Christine
Colin, Ides M.
Gerard, Anne-Catherine
More authors (4 more) Less
Language :
English
Title :
A coherent organization of differentiation proteins is required to maintain an appropriate thyroid function in the Pendred thyroid.
Publication date :
2010
Journal title :
Journal of Clinical Endocrinology and Metabolism
ISSN :
0021-972X
eISSN :
1945-7197
Publisher :
Oxford University Press, New York, United States - New York
Volume :
95
Issue :
8
Pages :
4021-30
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
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