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The alarmin HMGB‐1 influences healing outcomes in fetal skin wounds

Identifieur interne : 003A44 ( Main/Merge ); précédent : 003A43; suivant : 003A45

The alarmin HMGB‐1 influences healing outcomes in fetal skin wounds

Auteurs : Adrienne D. Dardenne ; Brian C. Wulff ; Traci A. Wilgus [États-Unis]

Source :

Wound Repair and Regeneration [ 1067-1927 ] ; 2013-03.

RBID : ISTEX:A96DCA10748A4825D1C6355B871575F1BF94F146

Abstract

In mice, cutaneous wounds generated early in development (embryonic day 15, E15) heal scarlessly, while wounds generated late in gestation (embryonic day 18, E18) heal with scar formation. Even though both types of wounds are generated in the same sterile uterine environment, scarless fetal wounds heal without inflammation, but a strong inflammatory response is observed in scar‐forming fetal wounds. We hypothesized that altered release of alarmins, endogenous molecules that trigger inflammation in response to damage, may be responsible for the age‐related changes in inflammation and healing outcomes in fetal skin. The purpose of this study was to determine whether the alarmin high‐mobility group box‐1 (HMGB‐1) is involved in fetal wound repair. Immunohistochemical analysis showed that in unwounded skin, E18 keratinocytes expressed higher levels of HMGB‐1 compared with E15 keratinocytes. After injury, HMGB‐1 was released to a greater extent from keratinocytes at the margin of scar‐forming E18 wounds, compared with scarless E15 wounds. Furthermore, instead of healing scarlessly, E15 wounds healed with scars when treated with HMGB‐1. HMGB‐1‐injected wounds also had more fibroblasts, blood vessels, and macrophages compared with control wounds. Together, these data suggest that extracellular HMGB‐1 levels influence the quality of healing in cutaneous wounds.

Url:

DOI: 10.1111/wrr.12028

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ISTEX:A96DCA10748A4825D1C6355B871575F1BF94F146

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<front><div type="abstract" xml:lang="en"><p id="P1">In mice, cutaneous wounds generated early in development (embryonic day 15, E15) heal scarlessly, while wounds generated late in gestation (embryonic day 18, E18) heal with scar formation. Even though both types of wounds are generated in the same sterile uterine environment, scarless fetal wounds heal without inflammation but a strong inflammatory response is observed in scar-forming fetal wounds. We hypothesized that altered release of alarmins, endogenous molecules that trigger inflammation in response to damage, may be responsible for the age-related changes in inflammation and healing outcomes in fetal skin. The purpose of this study was to determine whether the alarmin high-mobility group box -1 (HMGB-1) is involved in fetal wound repair. Immunohistochemical analysis showed that in unwounded skin, E18 keratinocytes expressed higher levels of HMGB-1 compared to E15 keratinocytes. After injury, HMGB-1 was released to a greater extent from keratinocytes at the margin of scar-forming E18 wounds compared to scarless E15 wounds. Furthermore, instead of healing scarlessly, E15 wounds healed with scars when treated with HMGB-1. HMGB-1-injected wounds also had more fibroblasts, blood vessels, and macrophages compared to control wounds. Together, these data suggest that extracellular HMGB-1 levels influence the quality of healing in cutaneous wounds.</p>
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The alarmin HMGB‐1 influences healing outcomes in fetal skin wounds

The alarmin HMGB‐1 influences healing outcomes in fetal skin wounds

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