Enhanced Inflammation and Accelerated Wound Closure Following Tetraphorbol Ester Application or Full-Thickness Wounding in Mice Lacking Hyaluronan Synthases.

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Enhanced Inflammation and Accelerated Wound Closure Following Tetraphorbol Ester Application or Full-Thickness Wounding in Mice Lacking Hyaluronan Synthases Has1 and Has3  Judith A. Mack, Ron J. Feldman, Naoki Itano, Koji Kimata, Mark Lauer, Vincent C. Hascall, Edward V. Maytin  Journal of Investigative Dermatology  Volume 132, Issue 1, Pages 198-207 (January 2012) DOI: 10.1038/jid.2011.248 Copyright © 2012 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 1 TPA-stimulated accumulation of HA in the epidermis is blunted in Has1/3-null mice. (a–l) Dorsal skin was treated with TPA or vehicle alone (× 3 days), biopsied, and evaluated histologically for morphological changes (H&E stains), HA levels (bHABP and streptavidin-Cy3), and CD44 protein levels (anti-CD44/rhodamine). Specific HA staining was confirmed by pretreatment of specimens with hyaluronidase (e, inset). (m, n) TPA-treated or control epidermis was separated using dispase, and analyzed for concentrations (ngmg−1) of HA using an ELISA-like assay (m), or analyzed for relative expression of Has1, Has2, and Has3 mRNA using quantitative real-time PCR (qPCR; n). In Has1/3-null skin, only Has2 expression was analyzed. The P-values from two-sided Student's t-test are indicated. Dashed/dotted lines: epidermal boundaries. Bar=100μm. bHABP, biotinylated hyaluronan-binding probe; DAPI, 4,6-diamidino-2-phenylindole; HA, hyaluronan; H&E, hematoxylin and eosin; Has, hyaluronan synthase; mRNA, messenger RNA; TPA, 12-O-tetradecanoylphorbol-13-acetate; WT, wild type. Journal of Investigative Dermatology 2012 132, 198-207DOI: (10.1038/jid.2011.248) Copyright © 2012 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 2 Wound closure is accelerated in Has1/3-null mice. (a) Typical examples of 5-mm diameter full-thickness excisional wounds. Wounds were photographed daily until closure. (b) Graphical summary of changes in wound area, expressed relative to the initial size of the wound at day 0. Data are mean±SEM; the number of mice analyzed at each time point is shown beneath each data symbol. Open circles, wild type; closed circles, Has1/3 null. (*), P<0.01; (**), P<0.005 by two-sided Student's t-test. Has, hyaluronan synthase. Journal of Investigative Dermatology 2012 132, 198-207DOI: (10.1038/jid.2011.248) Copyright © 2012 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 3 HA levels are altered in Has1/3-null mice after wounding. (a) Fluorescence-assisted carbohydrate electrophoresis analysis of HA levels in equivalent amounts (weight) of skin from WT or Has1/3-null mice; treatments as shown. Disaccharide (Δ di-HA) bands are displayed for individual wounds (5 mice per condition). (b) Integrated fluorescent intensity of Δ di-HA bands from 3-day wounds or TPA-treated skin, relative to WT non-injured controls (mean±SD, n=5). (c) HA in skin adjacent to incisional wounds (<1mm from wound edge) at 24hours post injury, immunostained with bHABP/streptavidin-Cy3. Bar=25μm. (d) Time course of Has messenger RNA expression post wounding in WT mice or Has1/3-null mice. Mean±SD, duplicate mice, triplicate qPCR reactions per wound. (*) Significant increase or (**) significant decrease, at P<0.05 level. bHABP, biotinylated hyaluronan-binding probe; HA, hyaluronan; Has, hyaluronan synthase; qPCR, quantitative real-time PCR; TPA, 12-O-tetradecanoylphorbol-13-acetate; WT, wild type. Journal of Investigative Dermatology 2012 132, 198-207DOI: (10.1038/jid.2011.248) Copyright © 2012 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 4 Preferentially enhanced inflammation in Has1/3-null skin following TPA application (3 days) or full-thickness wounding (24hours). (a–c) Hematoxylin and eosin stains of non-injured wild-type, TPA-treated wild-type, or TPA-treated Has1/3-null skin. BV, dilated blood vessels. (d, e) Masson-Trichrome stains of subdermal vascular plexus (SVP) immediately adjacent to the wound, in wild-type or Has1/3-null mice. Insets, neutrophil-specific immunostains of the SVP. (f, g) Cartoon of events in wild-type skin after wounding. (h, i) Tissues in the SVP region, costained for HA (green) and neutrophils (red). Graphs: Data (mean±SEM) for neutrophils (j) and dilated vessels (k) after TPA treatment, or HA staining intensity (l), neutrophils near blood vessels in the subdermis (m), and neutrophils in the dermis (n) of wounded skin. Bar=50μm. HA, hyaluronan; Has, hyaluronan synthase; TPA, 12-O-tetradecanoylphorbol-13-acetate; WT wild type. Journal of Investigative Dermatology 2012 132, 198-207DOI: (10.1038/jid.2011.248) Copyright © 2012 The Society for Investigative Dermatology, Inc Terms and Conditions