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首页> 外文期刊>Journal of Cellular Physiology >Cutaneous cell and extracellular matrix responses to ultraviolet-B irradiation.
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Cutaneous cell and extracellular matrix responses to ultraviolet-B irradiation.

机译:皮肤细胞和细胞外基质反应紫外线b辐射。

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The present study examined fibroblasts and keratinocytes in monolayers and cultured within dermal and skin substitutes and their use in assessing the effect of UVB irradiation on cutaneous cells and extracellular matrix organization. Dermal substitutes (DS) were produced by incorporating normal fibroblasts into a collagen lattice and skin substitutes (SS) were obtained by seeding normal keratinocytes onto the DS. Keratinocyte monolayers, fibroblast monolayers, DS, and SS were exposed once a day to a UVB source (10 mJ/cm2). The irradiation protocol was stopped when the keratinocytes of the non-irradiated cultures (control groups) had reached confluence. Microscopic observations revealed that UVB radiation decreased both fibroblast and keratinocyte growth and enhanced their differentiation resulting in (1) less fibroblasts in the DS and SS, and (2) incomplete coverage of the DS by keratinocytes. Microscopic observations and histological analyses revealed major morphological changes. Both cell types became bigger and presented wide nuclei and vacuoles in the cytoplasm. No organized deep epidermal layer was observed in irradiated compared to non-irradiated SS. Irradiated DS and SS extracellular matrices showed an irregular aggregating collagen fiber organization with serious discrepancies suggesting large defects in the structural properties of the extracellular matrix. The present study demonstrated that exposure to a UVB source led to profound morphological and functional disturbances in both cutaneous cells and in the extracellular matrices of the DS and SS. The present technology would be of great interest for step-by-step studies of UVR effects on cutaneous cell morphology and functional properties, and could be an alternative to using animals for pharmacological and toxicological evaluations.
机译:本研究检测成纤维细胞角化细胞单层膜和内部培养皮肤和皮肤替代品及其使用评估UVB照射的效果皮肤细胞和细胞外基质组织。将正常成纤维细胞产生的胶原晶格和皮肤替代品(SS)通过播种正常角化细胞上DS。单层膜,DS和SS受到一天一次(10 mJ / cm2) UVB来源。协议的角化细胞时停止non-irradiated文化(对照组)达到融合。透露,UVB辐射减少成纤维细胞和角质细胞生长和增强他们的分化导致(1)更少成纤维细胞在DS和党卫军,和(2)不完整角化细胞的DS的报道。观察和组织学分析主要的形态学变化。变得更大更广泛的核和细胞质液泡。在辐照观察表皮层而non-irradiated党卫军。辐照DS和SS细胞外矩阵显示不规则聚合胶原纤维组织严重的差异表明大缺陷细胞外的结构属性矩阵。暴露在UVB来源导致深远的形态和功能障碍皮肤细胞和细胞外基质DS和党卫军。目前的技术紫外线辐射的逐步研究的极大兴趣对皮肤的细胞形态和影响功能性质,可能是一个使用动物药理的替代品和毒理学评价。

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