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Morphology of Filaggrin-Depleted Epidermis

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Abstract

Depletion of filaggrin results in dose-dependent impairment of epidermal permeability barrier function, which is characterized by distinctive morphological changes best detectable in ichthyosis vulgaris. In addition to increased skin surface pH, epidermal hyperplasia, augmented number of stratum corneum (SC) cell layers, and decreased SC hydration, the keratinocytes of the stratum granulosum show an absence to near-absence of F-type keratohyalin granules and perinuclear halos resulting from retraction of keratin intermediate filaments. Although filaggrin is an intracellular protein, filaggrin-deficient corneocytes display only a slightly reduced integrity and increased permeation verifiable by elevated transepidermal water loss (TEWL) that occurs solely via a paracellular route. This goes together with an abnormal extracellular lamellar bilayer architecture due to impaired loading of secretory cargo within lamellar bodies and nonuniform extracellular post-secretory dispersion of secreted organelle contents. Furthermore, filaggrin-depleted epidermis features defective corneocyte cohesion based on decreased corneodesmosome density and length and impaired tight junction (TJ) formation pointed by abnormal expression and localization of TJ proteins.

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Gruber, R. (2014). Morphology of Filaggrin-Depleted Epidermis. In: Thyssen, J., Maibach, H. (eds) Filaggrin. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-54379-1_2

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  • DOI: https://doi.org/10.1007/978-3-642-54379-1_2

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