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Spatial and temporal alterations in the collagen fibrillar array during the onset of transparency in the avian cornea

Connon, Che J., Meek, Keith Michael Andrew ORCID:, Kinoshita, S. and Quantock, Andrew James ORCID: 2004. Spatial and temporal alterations in the collagen fibrillar array during the onset of transparency in the avian cornea. Experimental Eye Research 78 (5) , pp. 909-915. 10.1016/j.exer.2004.01.005

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In the latter stages of development, the embryonic aviancornea undergoes significant changes in structure, composition and transparency. The rearrangement of stromal collagen fibrils at this time is important because it is believed to play a key role in the acquisition of corneal transparency. Here, we investigate spatialalterations in the internal fine structure of the aviancornea during development. Chicken corneas at developmental days 14, 16 and 18 were examined by transmission electron microscopy and quantitative image analysis. For anterior and posterior regions we determined fibril number densities, two-dimensional distribution functions, and, where appropriate, radial distribution functions. Stromal collagen fibrils became more closely spaced over the developmental range studied here. Changes in fibril number density indicated that fibrils became compacted first in the anterior stroma, and later (i.e. after day 16) in the posterior stroma. By day 18 collagen fibril number densities were essentially the same in superficial and deep tissue regions. At day 14, two-dimensional distribution functions of collagen fibrils in the posterior stroma pointed to a fibrillararray that was unlike that in the anterior stroma because there was no clear radial symmetry. Rather, in the deep stroma at day 14 there was evidence of different nearest neighbour spacings in two orthogonal directions. By day 18, fibril distributions in the anterior and posterior stroma were spatially homogeneous and radially symmetric, with radial distribution functions typical of those ordinarily found in mature cornea. Corneal transparency requires the stromal matrix to have some degree of regularity in the arrangement of its uniformly thin collagen fibrils. The chicken cornea becomes progressively transparent between days 14 and 18 of development as the stroma dehydrates and thins. We show that over this time period collagen fibrils in the anterior stroma become configured in advance of fibrils in deeper stromal regions, leading to questions over the potential roles of sulphated proteoglycans in different regions of the corneal stroma during morphogenesis.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Optometry and Vision Sciences
Subjects: R Medicine > RE Ophthalmology
Uncontrolled Keywords: corneal stroma; collagen; corneal development; chick cornea; proteoglycans; corneal transparency
Publisher: Elsevier
ISSN: 0014-4835
Last Modified: 20 Oct 2022 09:53

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