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Sebaceous gland, hair shaft, and epidermal barrier abnormalities in keratosis pilaris with and without filaggrin deficiency

Gruber, R., Sugarman, J.L., Crumrine, D., Hupe, M., Mauro, T.M., Mauldin, E.A., Thyssen, J.P., Brandner, J.M., Hennies, Hans C., Schmuth, M. and Elias, P.M. (2015) Sebaceous gland, hair shaft, and epidermal barrier abnormalities in keratosis pilaris with and without filaggrin deficiency. The American Journal of Pathology, 185 (4). pp. 1012-1021. ISSN 0002-9440

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Abstract

Although keratosis pilaris (KP) is common, its etiopathogenesis remains unknown. KP is associated clinically with ichthyosis vulgaris and atopic dermatitis and molecular genetically with filaggrin-null mutations. In 20 KP patients and 20 matched controls, we assessed the filaggrin and claudin 1 genotypes, the phenotypes by dermatoscopy, and the morphology by light and transmission electron microscopy. Thirty-five percent of KP patients displayed filaggrin mutations, demonstrating that filaggrin mutations only partially account for the KP phenotype. Major histologic and dermatoscopic findings of KP were hyperkeratosis, hypergranulosis, mild T helper cell type 1-dominant lymphocytic inflammation, plugging of follicular orifices, striking absence of sebaceous glands, and hair shaft abnormalities in KP lesions but not in unaffected skin sites. Changes in barrier function and abnormal paracellular permeability were found in both interfollicular and follicular stratum corneum of lesional KP, which correlated ultrastructurally with impaired extracellular lamellar bilayer maturation and organization. All these features were independent of filaggrin genotype. Moreover, ultrastructure of corneodesmosomes and tight junctions appeared normal, immunohistochemistry for claudin 1 showed no reduction in protein amounts, and molecular analysis of claudin 1 was unremarkable. Our findings suggest that absence of sebaceous glands is an early step in KP pathogenesis, resulting in downstream hair shaft and epithelial barrier abnormalities.

Item Type: Article
Additional Information: Unmapped bibliographic data: ST - Sebaceous gland, hair shaft, and epidermal barrier abnormalities in keratosis pilaris with and without filaggrin deficiency [Field not mapped to EPrints] C2 - PMC4380844 [Field not mapped to EPrints] AD - Department of Dermatology and Venereology, Division of Human Genetics, Innsbruck Medical University, Innsbruck, Austria. Electronic address: r.gruber@i-med.ac.at. [Field not mapped to EPrints] AN - 25660180 [Field not mapped to EPrints]
Uncontrolled Keywords: Abnormalities, Multiple/genetics/*pathology
Subjects: Q Science > QH Natural history > QH301 Biology
Q Science > QH Natural history > QH426 Genetics
Schools: School of Applied Sciences
Depositing User: Hans Hennies
Date Deposited: 06 Jul 2016 14:27
Last Modified: 29 Jul 2016 12:58
URI: http://eprints.hud.ac.uk/id/eprint/28759

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