Macular degeneration destroys light-sensing cells in the retina. Researchers at other institutions have hypothesized that placing templates on the retina could enable transplanted cells to take hold and grow.

Biomedical engineers at Purdue used an instrument called an atomic force microscope and a device called a cantilever to lay down lines of peptides in a process known as dip-pen nanolithography. The pattern was permanently attached to a dime-size piece of retina extracted from the eye of a pig, said Albena Ivanisevic, an assistant professor of biomedical engineering and an assistant professor of chemistry at Purdue. The work was not done with live pigs.

"We wanted to demonstrate that we could perform lithography, or patterning, on something other than a metal, semiconductor or insulator surface," Ivanisevic said. "Here we have shown that it can be done on retinal tissue."

Ivanisevic detailed findings in a talk presented Dec. 3 during a meeting of the Materials Research Society in Boston.

"We are interested in making surfaces that can eventually be used for transplant strategies," Ivanisevic said. "It has been proposed that you might implant retinal pigment epithelial cells as a potential treatment for macular degeneration, but the success of such a procedure could be greatly increased if you used some sort of a template or scaffold."

Peptides are made of amino acids, the building blocks of proteins.

The Purdue engineer conducted tests demonstrating that the templates were permanently attached to the retinal tissues, but further work is needed to determine the precise nature of the bonds
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Contact: Emil Venere
venere@purdue.edu
765-494-4709
Purdue University
5-Dec-2003