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New Device to Test Drugs on Thousands of Individual Living Cells

November 4th, 2019 Medgadget Editors Medicine, Public Health

Studying how individual cells are affected by chemical compounds, viral infections, and other agents can have profound practical consequences for the development of new drugs and novel therapies for disease.

Conventionally, antivirals are studied in terms of how they influence entire cellular cultures, which can lead to researchers missing important events that happen in only some cells. To observe individual cells, lab techs have to manually load individual cells into dozens of plate wells, which is highly laborious and very slow for something that should be done on the order of thousands of cells.

Now, researchers at Penn state have developed a microfluidic device that has about 5700 wells that can be filled with individual cells. The cells can be exposed to a virus or other agent, and how each cell responds to that agent can be closely monitored using a microscope.

One of the challenges in building the device was being able to successfully load most of the wells with live cells. This was accomplished thanks to a novel trap that allowed the team to make sure that over 90% of the wells get a resident cell.

“Other people have tried to study infections in single cells, but they have to manually add cells to 96-well or 384-well plates,” said Wu Liu, one of the lead scientists behind the research. “This is tedious and time-consuming. With our trap and microfluidic device, we can observe more than 5000 single cells at one time.”

The team has already tested the device on a modified, fluorescent version of the poliovirus. They were able to track when and how fast the virus replicates, as well as its maximum growth rate, and how these are influenced by antiviral drugs. Seeing that three different drugs had markedly different effects on the rate of viral growth points to them working in somewhat different ways. This knowledge may help to better pick which drugs to use for which patients, but to also create new drugs that are even better than existing ones.

“This single-cell approach could also be useful for studying combinations of antivirals, as we can now see effects other than just the overall amount of killing,” said Craig Cameron, senior author of the study. “For example, a drug combination might slow the speed of virus replication, which might give the host’s immune system time to clear the infection. You wouldn’t see that from a population analysis.”

Study in journal Science Advances: More than efficacy revealed by single-cell analysis of antiviral therapeutics

Via: Penn State

Medgadget Editors

Medical technologies transform the world! Join us and see the progress in real time. At Medgadget, we report the latest technology news, interview leaders in the field, and file dispatches from medical events around the world since 2004.

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