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Clonal characterization of fibroblasts in the superficial layer of the adult human dermis

机译:成年人类真皮表层成纤维细胞的克隆特征

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The dermis of adult human skin contains a physiologically heterogeneous population of fibroblasts that interact to produce its unique architecture and that participate in inflammatory and wound repair functions in vivo. This heterogeneity has been well documented for fibroblasts located in the superficial papillary dermis and the deep reticular dermis. However, the existence of diverse fibroblast subpopulations within a given region of the dermis has not been explored. In this study, fibroblast cultures have been established from the superficial dermis following enzymatic dissociation of the tissue. These fibroblasts have been cloned by limiting dilution and initially selected on the basis of morphology and proliferation kinetics. Fibroblasts in some of the clones selected for study express α-smooth muscle actin, a myofibroblast characteristic. Significant differences for fibroblast clones obtained from the same piece of skin have been observed with regard to their rate of collagen lattice contraction, their ability to organize a fibronectin matrix, their release of specific growth factors/cytokines into culture medium, and their response to interleukin-1α. These differences in both morphological and physiological characteristics indicate that the superficial papillary dermis contains a heterogeneous population of fibroblasts. This heterogeneity might indicate that diverse subpopulations of fibroblasts are required to interact in both homeostatic and pathological situations in skin.
机译:成年人类皮肤的真皮层包含生理异源的成纤维细胞群,它们相互作用产生其独特的结构,并参与体内的炎症和伤口修复功能。对于位于浅表乳头状真皮和网状真皮深层的成纤维细胞,这种异质性已得到充分证明。然而,尚未探索在真皮的给定区域内存在不同的成纤维细胞亚群。在这项研究中,在组织酶解后,从表层真皮建立了成纤维细胞培养物。这些成纤维细胞已通过有限稀释进行克隆,并首先根据形态学和增殖动力学进行选择。选择进行研究的某些克隆中的成纤维细胞表达α-平滑肌肌动蛋白,这是肌成纤维细胞的特征。已观察到从同一块皮肤获得的成纤维细胞克隆在胶原蛋白晶格收缩率,组织纤连蛋白基质的能力,特定生长因子/细胞因子向培养基中的释放以及对白介素的反应方面存在显着差异。 -1α。形态和生理特征的这些差异表明浅表乳头状真皮含有异质成纤维细胞群。这种异质性可能表明成纤维细胞的不同亚群需要在皮肤体内稳态和病理情况下相互作用。

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