Structure and Function of Human Stratum corneum under Deformation

Dermatology - Tập 205 Số 4 - Trang 353-357 - 2002
Jean‐Luc Lévêque1, P. Hallégot2, J. Doucet3, Gérald Pierard4
1L'Oréal Recherche, Clichy,
2L'Oréal Recherche, Aulnay-sous-Bois, et
3LURE, Université de Paris-Sud, Orsay, France
4University Medical Center Sart-Tilman, Liège, Belgium

Tóm tắt

<i>Background:</i> The stratum corneum (SC) has an important barrier function. The effect of a mechanical stress applied to the SC is controversial on this important physiological parameter. <i>Objective and Methods:</i> To assess both in vitro and in vivo the structure and function of human SC submitted to controlled strains, we measured the transepidermal water loss (TEWL), in vivo, on human skin submitted to controlled strains ranging from 0 to 20% extension imposed by a Densi-score device. We also looked at the structure of the SC by means of X-ray diffraction and transmission electron microscopy. <i>Results:</i> Transmission electron microscopy and X-ray diffraction analysis were performed on harvested and stretched human SC. TEWL was not significantly influenced by the relative deformation applied to the skin. At high strain (60%) imposed in vitro to the SC, lipid bilayers and corneosomes were detached from corneocytes. Only rare corneosomes showed internal disruption. X-ray analysis did not reveal modifications in the supramolecular organization of intercellular lipids while stretching the SC. <i>Conclusion:</i> Submitting human SC to an extension force up to 20% elongation does not significantly alter the barrier function.

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Tài liệu tham khảo

10.1159/000056341

10.1111/1523-1747.ep12492217

10.1016/0892-0354(89)90002-6

10.1159/000051627