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Artificial Liver Culture as Platform for Hep C Research

July 18th, 2008 Medgadget Editors News

At the UCSD School of Medicine researchers have developed a tissue culture that can model the behavior of a HCV infected liver.

“This is the first efficient and consistent model system for HCV to be developed,” said Buck [Martina Buck, Ph.D., Assistant Professor of Medicine at UC San Diego’s Department of Medicine and Moores UCSD Cancer Center –ed.], adding that it will now enable researchers not only to conduct mechanistic experiments in culture, such as blocking the virus pathways, but also to more effectively screen possible therapies for HCV. “There is a need for new treatments, and for development of a possible vaccine for HCV. Now we have a model system to support work by investigators in this area.”
Currently, there is only a single treatment for HCV, PEG- interferon-α. The drug combination has an average response rate of about 50 percent in HCV cases, but it is much lower than that, closer to 20 percent, in individuals with liver cirrhosis. It can also cause severe flu-like side effects. Approximately 10,000 deaths due to cirrhosis of the liver and several thousand more from liver cancer are attributed to HCV infection in the United States each year.
The HCV life cycle is only partially understood because, until now, it has not been possible to efficiently infect normal human hepatocytes, or liver cells, in culture. According to Buck, the valuable Huh-7 system currently in use to test HCV uses cloned, synthetic HCV RNA expressed from liver tumor cells. These cells cannot be infected with naturally occurring HCV obtained from infected patients.
In contrast, the culture developed by the UCSD scientists allows direct infection with HCV genotypes 1, 2, 3 and 4 from the blood of HCV-infected patients. This system will enable researchers to study the complete viral lifecycle in its normal host cell, providing novel scientific opportunities. The study reports that the system has been tested using over 30 virus donors as well as multiple donors of hepatocytes, with the production of infectious HCV for all genotypes tested.

Press release: Improved Culture System for Hepatitis C Virus Infection…
Image: The venous arrangement of the liver revealed by injection of the hepatic portal veins with yellow dye and the centrolobular veins with red dye. Wellcome Images

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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