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Differential Distribution of Elastic Tissue in Human Natural Skin and Tissue-Engineered Skin

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Abstract

Tissue-engineered skins (TES), manufactured by epidermal and dermal equivalents, are now being used in biological, pharmacotoxicological and clinical applications. It is thus interesting to know to what extent artificial organs are similar to natural counterparts. Elastic fibres are important constituents of the extracellular matrix of natural skin (NS). The aim of our study was to investigate the possible occurrence and distribution of elastic tissue in a model of human TES using different histochemical techniques, including classical Orcein and Fuchsin–Resorcin methods and immunohistochemistry, at both light and electron microscopical levels. Immunoperoxidase and high resolution immunogold methods were used. In NS, classical staining techniques and elastin-immunohistochemistry revealed a well-organized network of elastic fibres. High resolution immunocytochemistry revealed an intense labelling in the amorphous component of elastic fibres. Fibres of different diameters were immunostained. In TES, no stained elastic fibres were observed using classical staining techniques, and the interpretation of immunoperoxidase observations was not clear-cut. In contrast, immunogold staining at the electron microscopical level provided specific labelling of elastin-like immunoreactive material in the dermal equivalent. However, ultrastructural immunocytochemistry revealed that elastic tissue organization in TES was poor compared to that in NS. This study demonstrates that elastic fibres are a component of the extracellular matrix in this model of TES and suggests that fibroblasts of the dermal equivalent are engaged in matrix secretion. Nevertheless, the level of extracellular matrix organization in TES is low compared to NS. Moreover, this study also suggests that different models of bilayered TES may differ with respect to extracellular matrix organization. These aspects should be considered when TES is used in biological and pharmacotoxicological studies. A better understanding of the factors influencing extracellular matrix formation in TES is necessary to achieve further development of skin generation in vitro.

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Authors and Affiliations

  1. Department of Experimental Medicine, Histology and Embryology Unit, University of Pavia, via Forlanini 10, I-27100 Pavia, Italy

    M. Casasco, A. Casasco, A. Icaro Cornaglia, A. Farina & A. Calligaro

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  1. M. Casasco
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  2. A. Casasco
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  3. A. Icaro Cornaglia
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  4. A. Farina
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  5. A. Calligaro
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Casasco, M., Casasco, A., Icaro Cornaglia, A. et al. Differential Distribution of Elastic Tissue in Human Natural Skin and Tissue-Engineered Skin. Histochem J 35, 421–428 (2004). https://doi.org/10.1023/B:HIJO.0000039858.18838.70

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