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Stem Cells Repair Damaged Corneas in Mice
Date:4/10/2009

ells had regenerated the collagen fibers, making the damaged corneas in the mice look normal, the researchers reported. After one year, the mice corneas still appeared normal.

Stem cells are being used in clinical trials in humans to regenerate other eye tissues, including the epithelium, said Dr. Richard Bensinger, an American Academy of Ophthalmology spokesman.

But he cautioned that the scar-like condition the mice have is different from scar tissue caused by an injury or infection in humans. The mice corneas contained "biochemically deficient tissue" that's missing a protein needed to correctly form the collagen matrix, he said.

A human eye with scar tissue is not missing a protein and has other issues.

"In mice, replacement of the missing protein restores the normal corneal architecture," Bensinger said. "Traumatized corneas in humans are not missing something but have too much of a broad array of proteins causing the scar. Treating such a scar with a replacement protein which happens to be one they already make is not likely to change the character of the scar."

Dr. Ivan Schwab, professor of ophthalmology and director of the Cornea and External Disease Service at the University of California, Davis, was more optimistic.

"Although many steps remain to bring this to a human trial level, this is a real biological step," Schwab said. "Not only does this provide new avenues for possible development of corneal tissues, but it offers new avenues for other tissues as well. This team is to be applauded for outstanding work."

Funderburgh said it will take about two years to develop stem cell cultures that would be suitable for testing in humans, after which they hope to begin clinical trials.

To date, there has not been a shortage of corneas for transplantation in the United States, although there have been shortages in countries where religious and cultural taboos discourage donating or usi
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Stem Cells Repair Damaged Corneas in Mice
Stem Cells Repair Damaged Corneas in Mice
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