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Molecular probes permit doctors to detect diabetic retinopathy before vision fails
Date:9/2/2014

A new study published in the September issue of The FASEB Journal, http://www.fasebj.org, identifies a novel strategy to diagnose the leading cause of blindness in adults, diabetic retinopathy, before irreversible structural damage has occurred. This advance involves quantifying the early molecular changes caused by diabetes on the endothelium of retinal vessels. Using new probes developed by scientists, they were able to distinguish the early molecular development of diabetic retinopathy.

"My goal is to establish a versatile clinical tool that alerts of a disease process right when the first molecular changes take place. This will then provide ample opportunity to act, as opposed to merely acknowledge that there is structural damage that we cannot do anything about," said Ali Hafezi-Moghadam, M.D., Ph.D., a researcher involved in the work from the Center for Excellence in Functional and Molecular Imaging at Brigham and Women's Hospital and Harvard Medical School in Boston, MA. "Here, we have shown it in an important disease, the diabetic retinopathy, but there is no reason to stop there."

Hafezi-Moghadam and colleagues identified a target on the intraluminal surface of the retinal vessels that is expressed at higher levels in diabetes. They found significantly more vascular endothelial growth factor receptor 2 (VEGFR-2) in the diabetic micro-vessels compared to control. They then custom-generated molecular probes and characterized their binding properties. Light-based live imaging was then used to quantify binding interaction. An unexpected finding in this work was that not only was VEGFR-2 higher in the retinas of diabetic animals as well as humans, but the molecule was found in the retinal micro vessels, not in the larger vessels. When the imaging probes were injected into the blood stream of living normal and diabetic animals, they circulated throughout the animal's vasculature. W
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Contact: Cody Mooneyhan
cmooneyhan@faseb.org
301-634-7104
Federation of American Societies for Experimental Biology
Source:Eurekalert

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