Proteoglycan Distribution During Healing of Corneal Stromal Wounds in Chick
| Autor: | Jody A. Summers Rada, John R. Hassell, Nirmala SundarRaj, Sonali Sundarraj, Robb Belak, Dana Fite, Shonosuke Okamoto |
|---|---|
| Rok vydání: | 1998 |
| Předmět: |
Lumican
Pathology medicine.medical_specialty Stromal cell Keratan sulfate Perlecan Cornea Cellular and Molecular Neuroscience chemistry.chemical_compound medicine Animals Eye Proteins Fluorescent Antibody Technique Indirect Wound Healing biology Chemistry Anatomy Periodic Acid-Schiff Reaction Sensory Systems Epithelium Ophthalmology medicine.anatomical_structure Chondroitin Sulfate Proteoglycans Proteoglycan Keratan Sulfate biology.protein Proteoglycans Heparitin Sulfate Laminin sense organs Wound healing Chickens Keratocan Heparan Sulfate Proteoglycans Corneal Injuries |
| Zdroj: | Experimental Eye Research. 67:433-442 |
| ISSN: | 0014-4835 |
| DOI: | 10.1006/exer.1998.0540 |
| Popis: | Proteoglycan distribution during corneal stromal healing in growing corneas of young chicks were histologically and immunohistochemically analysed. Single linear incisions to produce partial-thickness wounds were made in the corneas of 5 day old chicks. The corneas were harvested at different times after wounding and processed for either histochemical analyses using periodic acid-Schiff's reaction (PAS) or for indirect immunofluorescence analyses of lumican, keratocan, keratan sulfate, perlecan and laminin. Linear corneal stromal incisions were completely covered by migrated stratified epithelium by day 2 post wounding and resulted in a gaping wound with a thinner stroma. New stromal scar tissue formed between the epithelium and the original stroma that resulted in partial restoration of stromal thickness. During the first two to three weeks of healing, the stromal tissue filling the depression formed from the gaping wound, was hypercellular and PAS positive, indicating significantly higher levels of glycoprotein content but no new Bowman's membrane was formed. By four weeks, the scar tissue occupied a 2-3 mm wide region. Immunofluorescence analyses indicated that other major differences in the healing and normally growing stroma were the increased synthesis and deposition of perlecan and laminin. No differences were evident in the immunofluorescence for keratocan or keratan sulfate in the scar tissue, but the scar tissue did contain markedly decreased levels of lumican. Thus, the regulation of proteoglycan and glycoprotein synthesis is altered in the keratocytes that are recruited to the wounded regions in the growing corneal stroma of post-hatched young chicks. While synthesis and deposition of adhesive molecules including laminin and perlecan are elevated, the synthesis of one of the keratan sulfate proteoglycans, lumican, is reduced in the scar tissue as compared to the normally growing stroma. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect