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Viruses leave traces long after the infection is over

by Francesco Mazzagatti
August 25, 2021
in Health
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One could speculate that these long-term changes are one reason why cured hepatitis C patients have an increased risk of liver cancer

Katrin Martin

This model enabled the researchers to demonstrate that the virus disappears from the infected liver cells after a certain time period. It is not yet clear exactly how this happens. However, the researchers were able to rule out the possibility that the cells need the support of immune cells in order to do this. “Liver cells seem to have their own mechanism for removing a virus from within,” says Dr Peter Reuther, one of the study’s two lead authors. The chronic infection by such viruses is based on a continuous infection of new cells.

Despite the astonishing self-healing power of cells, the infection does not pass them by without leaving a trace. As further analysis of the healed cells showed, their genetic profile remained altered: the same genes were no longer read in the same quantity as in those cells that had not been subject to infection. The change particularly affected genes related to cell division and cellular metabolism. It is still unclear how long these changes persist, however. “We see significant parallels with other studies of cured hepatitis C patients. Their formerly infected liver cells show changes in the genetic material that influence genetic programs,” explains Dr Katrin Martin, co-lead author of the paper. This strongly suggests that the findings now obtained in mice can be extrapolated to humans, at least in certain important respects. “One could speculate that these long-term changes are one reason why cured hepatitis C patients have an increased risk of liver cancer.”

In further studies, the researchers now aim to determine whether such changes in genetic programs also affect the cells of other organs following temporary viral infections. At the same time, they also want to identify the mechanism by which the body’s cells manage to get rid of viruses. “Two questions arise from a medical perspective,” concludes Pinschewer. “How can these viruses be prevented from spreading from cell to cell in a chronic infection and thus affecting a large number of cells? And is it possible to reverse the changes in the genetic profile and prevent subsequent damage?” He adds that the question of long-term changes following a viral infection also concerns other indications, such as asthma and long Covid.

Source: University of Basel

Source: Healthcare in Europe

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