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Scientists 'herd' cells in new approach to tissue engineering
Date:3/11/2014

Berkeley -- Sometimes it only takes a quick jolt of electricity to get a swarm of cells moving in the right direction.

Researchers at the University of California, Berkeley, found that an electrical current can be used to orchestrate the flow of a group of cells, an achievement that could establish the basis for more controlled forms of tissue engineering and for potential applications such as "smart bandages" that use electrical stimulation to help heal wounds.

In the experiments, described in a study published this week in the journal Nature Materials, the researchers used single layers of epithelial cells, the type of cells that bind together to form robust sheathes in skin, kidneys, cornea and other organs. They found that by applying an electric current of about five volts per centimeter, they could encourage cells to migrate along the direct current field.

They were able to make the cells swarm left or right, to diverge or converge and to make collective U-turns. They also created elaborate shapes, such as a triceratops and the UC Berkeley Cal bear mascot, to explore how the population and configuration of cell sheets affect migration.

Directing herds vs. individuals

"This is the first data showing that direct current fields can be used to deliberately guide migration of a sheet of epithelial cells," said study lead author Daniel Cohen, who did this work as a student in the UC Berkeley-UC San Francisco Joint Graduate Program in Bioengineering. "There are many natural systems whose properties and behaviors arise from interactions across large numbers of individual parts  sand dunes, flocks of birds, schools of fish, and even the cells in our tissues. Just as a few sheepdogs exert enormous control over the herding behavior of sheep, we might be able to similarly herd biological cells for tissue engineering."

Galvanotaxis the use of electricity to direct cell movement had be
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Contact: Sarah Yang
scyang@berkeley.edu
510-643-7741
University of California - Berkeley
Source:Eurekalert  

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