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Repair of excisional wounds in the embryo
P Martin1, C Nobes, J McCluskey
1Department of Anatomy & Developmental Biology, University College London, UK.
Insights
Embryonic wound healing involves epidermal advancement via actin contraction, unlike adult healing. Key genes like c-fos and growth factors such as transforming growth factor beta-1 are activated, potentially driving cell proliferation and tissue contraction.
Area of Science:
- Developmental Biology
- Regenerative Medicine
- Cellular Biology
Background:
- Wound healing involves re-epithelialization and connective-tissue contraction in both embryonic and adult stages.
- Understanding embryonic wound healing mechanisms is crucial for regenerative medicine and developmental biology.
Purpose of the Study:
- To review recent studies on embryonic wound healing mechanisms in chick and rodent models.
- To investigate the cellular and molecular processes driving embryonic wound closure.
Main Methods:
- Analysis of embryonic wound healing in chick embryos.
- Examination of gene expression (c-fos, transforming growth factor beta-1) in rat and mouse embryos at wound sites.
Main Results:
- Embryonic wound epidermis closure in chicks is facilitated by actin pursestring contraction, differing from adult lamellipodial crawling.
- Rapid induction of c-fos and transforming growth factor beta-1 observed at embryonic wound margins in rodents.
- These molecular signals may initiate proliferation and mesenchymal contraction.
Conclusions:
- Embryonic wound healing utilizes distinct cellular mechanisms compared to adult healing.
- Specific gene and growth factor activations play a significant role in embryonic tissue repair and regeneration.
Abstract:
Wound healing in the embryo, just as in the adult, comprises two tissue movements: re-epithelialisation and connective-tissue contraction. In this brief review we describe our recent studies of these two movements in both chick and rodent embryo model systems. In the chick we have evidence that the embryonic wound epidermis is drawn forwards by contraction of an actin pursestring extending around the circumference of the wound, rather than by lamellipodial crawling as in adult healing. Significant connective-tissue contraction also occurs. In the rat and mouse embryo we have examined expression of transcription factors and growth factors at the wound edge. We discuss our observations that the immediate-early gene c-fos and the growth factor transforming growth factor beta-1 are rapidly induced at the embryonic wound margin, and the possibility that these signals may trigger proliferation of wound edge cells and contraction of the exposed wound mesenchyme.
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