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The dance of the cells: A minuet or a mosh?
Date:5/22/2011

at HSPH, and his colleague Xavier Trepat, a researcher at IBEC, are the only ones in the world that can now measure the forces within and between complex cellular groups. "We're beginning for the first time to see the forces and understand how they work when cells behave in large groups," said Trepat.

To do this, the researchers invented a measurement technology called Monolayer Stress Microscopy, which allows them to visualize the minute mechanical forces exerted at the junctions where individual cells are connected. Their studies led to discovery of a new phenomenon, which they named "plithotaxis," a term derived from Greek "plithos" suggestive of throng, swarm or crowd.

"If you studied a cell in isolation, you'd never be able to understand the behavior of a cell in a crowd," said Dhananjay Tambe, the first author and a research fellow at HSPH. Instead, the researchers studied groups of cells living in a single thin layera monolayerand precisely measured the forces each cell was experiencing as it was navigating within the group. The findings surprised them.

"We thought that as cells are movingsay, to close a woundthat the underlying forces would be synchronized and smoothly changing so as to vary coherently across the crowd of cells, as in a minuet," said co-first author Corey Hardin, a research fellow at Massachusetts General Hospital. "Instead, we found the forces to vary tremendously, occurring in huge peaks and valleys across the monolayer. So the forces are not smooth and orderly at all; they are more like those in a 'mosh pit'organized chaos with pushing and pulling in all directions at once, but collectively giving rise to motion in a given direction," he said.

"This new finding has the potential to alter, in a fundamental way, our understanding of mechano-biology and its role in the basic processes that underlie the function of monolayers in health and disease," said Fredberg. He also predicted the new report would be i
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Contact: Todd Datz
tdatz@hsph.harvard.edu
617-432-8413
Harvard School of Public Health
Source:Eurekalert

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