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Glaucoma's unique protein expression could enhance diagnosis and treatment
Date:5/4/2010

AUGUSTA, Ga. - An eye under pressure appears to express a unique set of proteins that physicians hope will one day help them better diagnose and treat glaucoma.

Glaucoma, the second leading cause of blindness worldwide, tends to progress silently until decreased vision indicates trouble, said Dr. Kathryn Bollinger, Medical College of Georgia clinician-scientist specializing in glaucoma.

But inside fluid-filled eyeballs, a changing protein profile 30 with significant increases and 17 with significant decreases identified among hundreds of proteins present appears to also give a heads-up, Bollinger reported during the Association for Research in Vision and Ophthalmology Annual Meeting April 30-May 6. The MCG ophthalmologist received the 2010 ARVO/Alcon Early Career Clinician-Scientist Research Award for the study.

With glaucoma, elevated pressures inside the eyeball stress the optic nerve and nerve arms called axons that reach out to communicate with the brain. Over time, increased pressure can kill nerve cells and axons and decrease vision. "At this point, we don't have a regenerative strategy," Bollinger said.

The pressure results from an imbalance in fluid production and loss. In a healthy eye, the fluid, called the aqueous humor, moves continually from the back to the front of the eye where it exits mostly via a natural tract between the iris and cornea first into spongy tissue near the cornea's base called the trabecular meshwork then into the venous system and back into the body.

In open-angle glaucoma, the most common type in this country, the tract remains open but fluid still backs up and scientists suspect changes in the permeability of the trabecular meshwork may be to blame. Topical glaucoma treatments work by reducing fluid production or increasing outflow through a secondary drainage system, also near the front of the eye. Ophthalmologists such as Bollinger can also create a new pathway sur
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Contact: Toni Baker
tbaker@mcg.edu
706-721-4421
Medical College of Georgia
Source:Eurekalert  

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