Cell-independent matrix configuration in early corneal development

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dc.citation.articleNumber107772
dc.citation.journalTitleExperimental Eye Research
dc.citation.volumeNumber187
dc.contributor.authorYoung, Robert D.
dc.contributor.authorKnupp, Carlo
dc.contributor.authorKoudouna, Elena
dc.contributor.authorRalphs, James R.
dc.contributor.authorMa, Yanhui
dc.contributor.authorLwigale, Peter Y.
dc.contributor.authorJester, James V.
dc.contributor.authorQuantock, Andrew J.
dc.date.accessioned2019-11-05T17:29:59Z
dc.date.available2019-11-05T17:29:59Z
dc.date.issued2019
dc.description.abstractMechanisms controlling the spatial configuration of the remarkably ordered collagen-rich extracellular matrix of the transparent cornea remain incompletely understood. We previously described the assembly of the emerging corneal matrix in the mid and late stages of embryogenesis and concluded that collagen fibril organisation was driven by cell-directed mechanisms. Here, the early stages of corneal morphogenesis were examined by serial block face scanning electron microscopy of embryonic chick corneas starting at embryonic day three (E3), followed by a Fourier transform analysis of three-dimensional datasets and theoretical considerations of factors that influence matrix formation. Eyes developing normally and eyes that had the lens surgically removed at E3 were studied. Uniformly thin collagen fibrils are deposited by surface ectoderm-derived corneal epithelium in the primary stroma of the developing chick cornea and form an acellular matrix with a striking micro-lamellar orthogonal arrangement. Fourier transform analysis supported this observation and indicated that adjacent micro-lamellae display a clockwise rotation of fibril orientation, depth-wise below the epithelium. We present a model which attempts to explain how, in the absence of cells in the primary stroma, collagen organisation might be influenced by cell-independent, intrinsic mechanisms, such as fibril axial charge derived from associated proteoglycans. On a supra-lamellar scale, fine cords of non-collagenous filamentous matrix were detected over large tissue volumes. These extend into the developing cornea from the epithelial basal lamina and appear to associate with the neural crest cells that migrate inwardly to form, first the corneal endothelium and then keratocytes which synthesise the mature, secondary corneal stroma. In a small number of experimental specimens, matrix cords were present even when periocular neural crest cell migration and corneal morphogenesis had been perturbed following removal of the lens at E3.
dc.identifier.citationYoung, Robert D., Knupp, Carlo, Koudouna, Elena, et al.. "Cell-independent matrix configuration in early corneal development." <i>Experimental Eye Research,</i> 187, (2019) Elsevier: https://doi.org/10.1016/j.exer.2019.107772.
dc.identifier.digitalCell-independent-matrix
dc.identifier.doihttps://doi.org/10.1016/j.exer.2019.107772
dc.identifier.urihttps://hdl.handle.net/1911/107592
dc.language.isoeng
dc.publisherElsevier
dc.rightsThis is an open access article under the CC BY license (http://creativecommons.org/licenses/BY/4.0/).
dc.rights.urihttp://creativecommons.org/licenses/BY/4.0/).
dc.subject.keywordCornea
dc.subject.keywordCollagen
dc.subject.keywordDevelopment
dc.subject.keywordSerial block face scanning electron microscopy
dc.titleCell-independent matrix configuration in early corneal development
dc.typeJournal article
dc.type.dcmiText
dc.type.publicationpublisher version
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