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01 December 2008

The expressions of Fas and caspase-3 in human glaucomatous optic nerve axons

Renata ZalewskaABCDEFG, Bogdan ZalewskiABC, Joanna ReszecABCDEFG, Zofia MariakD, Lech ZimnochD, Ewa Proniewska-SkretekABCDEFG

Med Sci Monit 2008; 14(12): BR274-278 :: ID: 869475

Abstract

Background
Glaucoma is a chronic neurodegeneration of the optic nerve and one of the leading causes of vision loss in the world among the aging. Recent data suggest an important role for Fas receptor- and caspase-3-mediated apoptosis in the pathophysiology of glaucoma. In this study, Fas receptor and caspase-3 immunoexpression in the optic nerve axons of eyeballs with absolute glaucoma and eyes enucleated following extensive trauma were compared.
Material and Method
A series of 25 eyeballs were examined and enucleated during the period of 1994-2005. Seventeen eyeballs were removed from patients with absolute glaucoma who suffered from severe ophthalmalgia and 8 eyeballs were enucleated because of extensive injury on the day of injury or one day thereafter. The samples were obtained from the retrolaminar region of the optic nerve head and evaluated histopathologically. Immunohistochemistry was performed using polyclonal antibodies and the LSAB technique to determine Fas and caspase-3 expression.
Results
The percentages of positive Fas receptor and caspase-3 immunohistochemical staining were higher in the axons with absolute glaucoma than in the trauma group (p=0.0084 for Fas, p=0.0322 for caspase-3).
Conclusions
The results indicate that the apoptosis markers Fas receptor and caspase-3 might play a significant role in glaucoma neuropathy at the stage of absolute glaucoma.

Keywords: Optic Nerve - pathology, Glaucoma - pathology, Eye Enucleation, Axons, Caspase 3 - metabolism, Antigens, CD95 - metabolism, Aged, 80 and over, Adult

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Medical Science Monitor eISSN: 1643-3750
Medical Science Monitor eISSN: 1643-3750