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Findings could be used to engineer organs
Date:10/25/2012

Biologists have teamed up with mechanical engineers from the University of Texas at Dallas in cell research that provides information that may one day be used to engineer organs.

The research, published online in the Proceedings of the National Academy of Sciences, sheds light into the mechanics of cell, tissue and organ formation. The research revealed basic mechanisms about how a group of bacterial cells can form large three-dimensional structures.

"If you want to create an organism, the geometry of how a group of cells self-organizes is crucial," said Dr. Hongbing Lu, professor of mechanical engineering and holder of the Louis Beecherl Jr. Chair at UT Dallas and an author of the study. "We found that cell death leads to wrinkles, and the stiffer the cell the fewer wrinkles."

Organ formation is the result of individual cells teaming with others. The aggregate of the cells and their environment form a thin layer of what is known as a biofilm. These biofilms form 3-D wrinkled patterns.

Senior author Dr. Grol Sel, now at the University of California, San Diego, and his colleagues noticed dead cells under the wrinkle pattern. They teamed with Lu to discover what came first the cells' death or wrinkling. Lu is an expert in nanomechanics measuring forces on small objects.

They found that groups of cells dying together within the biofilm resulted in the formation of wrinkles. They also found that the stiffness of the biofilm affected the formation of wrinkles. This is significant because it lays the foundation for the first theory about building a structure in tissues and organs taking both the biological and mechanical forces into consideration.

"There are ways to control whether a biofilm is soft or stiff, and then you control the wrinkling and the ultimate structure the cells become," Lu said.

Researchers then controlled the location where cells died and were thereby able to create artific
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Contact: LaKisha Ladson
lakisha.ladson@UTDallas.edu
972-883-4183
University of Texas at Dallas
Source:Eurekalert

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