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Repair of the corneal epithelial adhesion structures following keratectomy wounds in diabetic rabbits
Repair of the corneal epithelial adhesion structures following keratectomy wounds in diabetic rabbits
- Source :
- Acta Ophthalmologica. 67:72-79
- Publication Year :
- 2009
- Publisher :
- Wiley, 2009.
-
Abstract
- In corneal tissue from a diabetic patient 15 months after delayed epithelial healing following vitrectomy surgery, electron microscopy revealed a discontinuous basement membrane; immunohistochemically, fibronectin was present in the basement membrane zone. To determine whether alterations in repair of the basement membrane, anchoring fibrils and hemidesmo-somes occur in wounds in diabetics, we studied the pattern of histochemical localization of bullous pemphigoid antigen (the intracellular hemidesmosome plaque component), laminin and type VII collagen (the anchoring fibril collagen) in alloxan-induced diabetic rabbits following superficial keratectomy. Ultrastructural studies of basal laminae and hemidesmosomes also were performed. Epithelial wound closure was complete by 66–72 h after 7-mm superficial keratectomies. Type VII collagen localized at the base of the epithelium at the wound periphery by 66 h, appearing as a beaded line underlying the epithelium; at 1 week, as in control rabbits, the localization zone extended across the wound bed. Polyclonal antibodies to laminin and bullous pemphigoid antigen showed similar localization. Small segments of basal laminae were noted by electron microscopy of the wound periphery as early as 66 h post-kera-tectomy. By 2 weeks, an increase in hemidesmosomes associated with segments of discontinuous basal lamina was apparent. No obvious differences in the time or pattern of re-appearance of the adhesion complex in keratectomy wounds could be discerned between normoglycemic and hyperglycemic rabbits. Thus, healing defects in diabetics may be due to factors other than reassembly of adhesion structures.
- Subjects :
- Adult
Pathology
medicine.medical_specialty
Dystonin
Nerve Tissue Proteins
Autoantigens
Basement Membrane
Epithelium
Diabetes Mellitus, Experimental
Cornea
Laminin
Vitrectomy
Anchoring fibrils
Cell Adhesion
Diabetes Mellitus
medicine
Animals
Humans
Corneal epithelium
Basement membrane
Wound Healing
Diabetic Retinopathy
integumentary system
biology
Chemistry
Hemidesmosome
General Medicine
Anatomy
Non-Fibrillar Collagens
Fibronectin
Cytoskeletal Proteins
Ophthalmology
medicine.anatomical_structure
biology.protein
Basal lamina
Collagen
Rabbits
Carrier Proteins
Subjects
Details
- ISSN :
- 1755375X
- Volume :
- 67
- Database :
- OpenAIRE
- Journal :
- Acta Ophthalmologica
- Accession number :
- edsair.doi.dedup.....e3cef7571809c254d17ca593e51e7e71
- Full Text :
- https://doi.org/10.1111/j.1755-3768.1989.tb07097.x