This physical stabilization and the tissue-specific microenvironment from our bioink improved epidermal organization, dermal ECM secretion, and barrier function.
Wound treatment with C15, however, resulted in collagen deposition with a more random collagen fiber orientation closer to unwounded dermal collagen organization, which equated to reduced alignment in comparison to that of vehicle-treated wounded skin (C15: 0.71 ± 0.02; Figures 4A 4C).
Which factors contribute to altered organization of dermal collagen matrix in skin fibrosis is not well understood.
Loss of dermal collagen density and organization is a hallmark of chronically aged skin and contributes to macroscopic changes in skin appearance (Fisher et al., 1997).
The major criteria are (1) basilar proliferation of atypical melanocytes which must extend at least three rete ridges beyond the dermal component and (2) organization of this proliferation in a lentiginous or epithelioid-cell pattern.
Genes uniquely expressed in dermal fibroblasts showed enrichment for extracellular matrix organization, immune response and wound responsive genes, which are frequently expressed in cancer cells [see Additional file 2: Figure S11d-f, Additional file 1: Table S5a].
The present study determined the effects of varying high molecular weight HA concentration on 1) the assembly kinetics, fibril microstructure, and viscoelastic properties of 3D type I collagen matrices and 2) the response of human dermal fibroblasts, in terms of morphology, F-actin organization, contraction, and proliferation within the matrices.
Linked to our findings that SAP-EGF accelerates wound reepithelialization, these previous studies suggest that wound coverage with SAPs may enable dermal responses as well, such as the early organization and remodeling of the provisional wound matrix.
These studies illustrate the micro-anatomy of dermal leukocytes and provide further insights into their functional organization.
Similar organization and composition of the fully developed teeth and dermal denticles, as well as similar stages of development, support the hypothesis of serial homology between epithelial mineralized structures.
Facial skin of the control side showed changes related to the chronologic and actinic aging, such as elastic fiber fragmentation, diminished density and organization of the fibrous extracellular matrix, and quiescence of the dermal fibroblasts.
