Dermal architecture is defined by an inverse correlation between fibroblast proliferation and ECM deposition Dermal architecture is defined by an inverse.

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Dermal architecture is defined by an inverse correlation between fibroblast proliferation and ECM deposition Dermal architecture is defined by an inverse correlation between fibroblast proliferation and ECM deposition AQuantification of fibroblast density (number of PDGFRαH2BEGFP+ cells, right; n = 3 biological replicates per time point) and dermis volume (left) with age (n = 7 for 12.5; n = 8 for 19.5, 25.5; n = 9 for 16.5, 17.5, 23.5; n = 10 for 29.5, 69.5; n = 11 for 10.5; n = 12 for 18.5, 21.5, 40.5; n = 20 for 31.5; biological replicates).BChanges in fibroblast proliferation and collagen deposition during dermal development in mice. Immunofluorescence staining for Ki67 (red) of PDGFRαH2BEGFP (green) back skin at indicated developmental time points (upper panel). Polarised light images of Picrosirius red stained back skin sections shown in binary images at indicated time points (lower panel).CPercentage of PDGFRαH2BEGFP+ cells in G1 cell cycle phase with age (n = 1 for 12.5; n = 2 for 21.5, 29.5; n = 3 for 16.5, 17, 19.5; n = 4 for 10.5; n = 5 for 17.5, 18.5, 69.5; n = 7 for 23.5; biological replicates) fitted using an exponential model.DQuantification of fibroblast proliferation (left; n = 4 for 16.5, 29.5; n = 3 for 10.5, 18.5, 21.5, 41.5, 59.5, 69.5; n = 2 for 17.5, 19.5; biological replicates) and collagen density (right; n = 4 for 16.5, 21.5, 24.5, 29.5, 33.5, 35.5, 41.5, 73.5; n = 3 for 10.5, 17.5, 18.5, 19.5, 31.5, 38.5; biological replicates) with age. Error bars represent standard deviation of the biological replicates.EImmunofluorescence image of R26Fucci2a x Dermo1Cre back skin at P2 where mVenus‐hGem (green) expressing cells are in S/G2/M phase, and mCherry‐hCdt1 (red)‐positive cells are in G1 phase.FPercentage of labelled cells in S/G2/M cell cycle phase in the upper and lower dermis at P0 (n = 3 biological replicates) and P2 (n = 4 biological replicates).G–IChanges in dermal cell proliferation and collagen deposition in human skin. (G) Immunofluorescence staining for vimentin (red) and Ki67 (green) of back skin at indicated time points (upper panel). Polarised light images of Picrosirius red stained back skin section shown as binary image at indicated time points (lower panel). (H) Quantification of proliferating cells in the upper and lower dermis (n = 3 biological replicates per time point). (I) Quantification of dermal cell proliferation (Ki67+) (left) and collagen density (right) with age (n = 3 biological replicates per time point). Note that cells in upper human dermis were more proliferative than cells in the lower dermis at all developmental time points analysed and that fibroblasts entered a quiescent, non‐proliferative state before collagen was efficiently deposited.Data information: Data shown are means ± s.d. Nuclei were labelled with DAPI (blue in B, E, G). Scale bars, 100 μm. wk, week. Emanuel Rognoni et al. Mol Syst Biol 2018;14:e8174 © as stated in the article, figure or figure legend