A New Tool to Map the Flow of Info within Living Cells

UNC School of Medicine researchers led by Klaus Hahn, PhD, John Sondek, PhD, and Daniel Marston, PhD, and colleagues at the University of Texas Southwestern Medical Center reveal the inner workings of cellular communication and processes important for cell migration and potentially metastasis.

A New Tool to Map the Flow of Info within Living Cells click to enlarge Imaging two or more protein activities at the same time allows researchers to map the signaling network coordinating cell movements. Warm colors (white, red) show sites of high activity, seen here at sites where the cell is protruding (arrowheads).

Media contact: Mark Derewicz, 984-974-1915, mark.derewicz@unchealth.unc.edu

CHAPEL HILL, NC – May 18, 2020 – How do cells move? Why do they move? Why do some cancer cells move slowly while others move quickly, causing a cancerous tumor to metastasize and become much more difficult to treat effectively? The answers are not as simple as we would want. They involve tiny proteins and processes that are very difficult to study in real time and space. The UNC Department of Pharmacology labs of Klaus Hahn, PhD, and John Sondek, PhD, are dedicated to overcoming this difficulty. And now their labs, with researchers at the University of Texas Southwestern Medical Center, have created a way to study and map the intricacies of intercellular signaling – when, where, and how tiny parts of cells communicate -- to make cells move.

Published in Nature Chemical Biology, the research provides a much-needed method for studying the precise movement mechanisms in healthy cells in real time and how these mechanisms might change in disease states, such as cancer metastasis.

“Our new tools allowed us to map the flow of signaling information within living cells and measure how much specific proteins contribute to cell behaviors, such as cell migration,” said co-first author Daniel Marston, PhD, assistant professor in the UNC Department of Pharmacology at the UNC School of Medicine.

To do this, Marston and colleagues relied on microscopy tools developed in the lab of Klaus Hahn, the Ronald G. Thurman Distinguished Professor of Pharmacology. These microscopy tools, which use fluorescent biosensors, allowed the researchers to visualize the activity of multiple proteins in living cells at the same time. Then, thanks to mathematical analytic methods developed at UT Southwestern Medical Center, the research team quantified how proteins regulate each other.

Together, these tools can provide precise information about how signaling networks are wired together and how they regulate cellular processes, such as cell migration and metastasis. They will allow researchers at UNC and elsewhere to understand how these networks operate in healthy cells. With that information in hand, researchers could compare data from healthy cells to cell movement during various health conditions, such as inflammation – a hallmark of many diseases.

“If we can find out how these movement processes are changed in diseases, such as cancers, then we might be able to design better treatments effective only for that particular disease, while keeping other cells healthy,” Marston added.

Co-first author is Marco Vilela, PhD, who developed the mathematical models while a postdoctoral fellow at the UT Southwestern Medical Center lab of co-senior author Gaudenz Danuser, PhD. Sondek and Hahn, both members of the UNC Lineberger Comprehensive Cancer Center, are co-senior authors. Other authors are Jaewon Huh, PhD, at UT Southwestern, and Jinqi Ren, PhD, Mihai Azoitei, PhD, and George Glekas, PhD, all at UNC-Chapel Hill at the time of their research on this project.

The National Institutes of Health, the Leukemia and Lymphoma Society, the Human Frontiers in Sciences Program, and UNC Lineberger funded this research.

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