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Researchers find that inhibiting microRNAs may help prevent degenerative eye disorders
Date:6/6/2011

DALLAS June 7, 2011 Blocking two tiny molecules of RNA a chemical cousin of DNA appears to suppress the abnormal growth of blood vessels that occurs in degenerative eye disorders, UT Southwestern Medical Center researchers have found.

Their findings, available in the Proceedings of the National Academy of Sciences, suggest a potential strategy to treat age-related macular degeneration (AMD), a vascular eye disorder that affects nearly 2 million Americans and is a leading cause of blindness among older people.

"MicroRNAs can affect multiple pathways involved in age-related macular degeneration," said Dr. Shusheng Wang, assistant professor of ophthalmology and pharmacology and co-senior author of the study. "Therapeutic manipulation of microRNAs 23 and 27 may give us a way to treat choroidal neovascularization in patients with degenerative retinal diseases."

In the study, researchers found that silencing the microRNA cluster members miR-23 and miR-27 hindered the excessive formation of blood vessels in the back of the eye, known as choroidal neovascularization. When these blood vessels hemorrhage and leak, it creates a sudden deterioration of central vision.

MicroRNAs are tiny pieces of genetic material that can target multiple components of signaling pathways. By interacting with other protein-making molecules in cells, they help fine-tune the expression of networks of genes and control cell function.

But microRNAs also can contribute to the excessive blood vessel formation that is responsible for vascular disorders, the current UT Southwestern study shows. That's because they stimulate the growth of new blood vessels from pre-existing vessels, a process called angiogenesis, which is an important natural process in the body used for healing and reproduction.

The body usually controls angiogenesis through a precise balance of growth and inhibitory factors in healthy tissues, Dr. Wang said. When t
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Contact: Robin Russell
robin.russell@utsouthwestern.edu
214-648-3404
UT Southwestern Medical Center
Source:Eurekalert

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