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The role of dermatopontin in the stromal organisation of the cornea.

Cooper, Leanne J. and Bentley, Adam J. and Nieduszynski, Ian A. and Talabani, Sheelan and Thomson, Alan and Utani, Atsushi and Shinkai, Hiroshi and Fullwood, Nigel J. and Brown, Gavin M. (2006) The role of dermatopontin in the stromal organisation of the cornea. Investigative Ophthalmology and Visual Science, 47 (8). pp. 3303-3310.

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Abstract

PURPOSE. Dermatopontin (DPT) is an abundant component of the stromal extracellular matrix; however, its function in the cornea is poorly understood. This study was conducted to determine whether DPT has a direct role in corneal matrix organization by investigating the ultrastructure of Dpt-null (Dpt–/–) mouse corneas. METHODS. Conventional light microscopy was used to compare the corneal thickness of Dpt–/– mice with that of the wild type. Collagen fibril distribution was studied using transmission electron microscopy and the datasets analyzed using image analysis software to determine fibrillar volume, fibril diameter, and spacing. RESULTS. Light microscopy demonstrated that Dpt–/– corneas in 2-month-old mice showed a 24% reduction in average stromal thickness compared with wild type (P < 0.001). The epithelium and Descemet’s membrane appeared normal. Examination of Dpt–/– stroma by transmission electron microscopy indicated significant disruption of fibril spacing within the posterior lamellae, whereas the mid and anterior regions appeared largely unaffected compared with wild type. The collagen fibrils in Dpt–/– stroma showed a lower fibril volume fraction and a pronounced change in posterior fibrillar organization. There was no apparent difference in fibril diameter between Dpt–/– and wild-type mice. CONCLUSIONS. Collectively, these data suggest that DPT plays a key role in collagen fibril organization. The defects in collagen organization in Dpt–/– cornea appear to be most severe in the posterior stroma. It is possible that DPT interacts with corneal proteoglycans and that this interaction is involved in the maintenance of stromal architecture.

Item Type: Article
Journal or Publication Title: Investigative Ophthalmology and Visual Science
Subjects: Q Science > QH Natural history > QH301 Biology
Departments: Faculty of Science and Technology > Lancaster Environment Centre
Faculty of Health and Medicine > Biomedical & Life Sciences
VC's Office
ID Code: 13102
Deposited By: Dr Gavin M Brown
Deposited On: 05 Sep 2008 11:10
Refereed?: Yes
Published?: Published
Last Modified: 26 Jul 2012 15:05
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/13102

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