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Calcium-dependent neuroepithelial contractions expel damaged cells from the developing brain
Leah Herrgen1, Oliver P Voss1, Colin J Akerman1
1Department of Pharmacology, University of Oxford, Mansfield Road, Oxford OX1 3QT, UK.
Developmental Cell
|December 4, 2014
Summary
Developing brains rapidly heal wounds by expelling damaged cells. ATP signaling triggers calcium waves and neuroepithelial contractions, clearing injury and preventing cell death.
Area of Science:
- Developmental biology
- Cell biology
- Neuroscience
Background:
- Adult wound healing involves inflammation and scarring.
- Embryonic wound healing is rapid and non-inflammatory, but mechanisms are unclear.
Purpose of the Study:
- Investigate rapid wound healing mechanisms in the developing brain.
- Identify cellular processes involved in embryonic tissue repair.
Main Methods:
- In vivo imaging in Xenopus laevis embryos.
- Analysis of ATP release, purinergic receptor activation, and calcium signaling.
- Assessment of cytoskeletal dynamics and actomyosin contractility.
Main Results:
- Damaged cells release ATP, activating purinergic receptors.
- ATP induces long-range calcium waves in neural progenitor cells.
- Neuroepithelial cells undergo Rho kinase-dependent contractions, expelling damaged cells within seconds.
Conclusions:
- Cell expulsion via neuroepithelial contraction is a novel rapid wound healing mechanism.
- This process prevents secondary damage and promotes tissue survival in developing brains.
- Embryonic wound repair differs significantly from adult mammalian responses.
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