Key result
Expression of hepatitis D antigen in HeLa and HepG2 cell lines resulted in a significant reduction in RNA synthesis and subsequent cell death, providing direct evidence for viral cytotoxicity.
Expression of hepatitis D antigen causes direct cytotoxicity in cell lines, supporting the hypothesis that HDV causes direct hepatocyte injury in vivo.
No change to HDV management warranted; leaves open direct cytotoxicity as a driver of human liver injury.
It has been postulated that hepatocyte injury resulting from infection with hepatitis D virus may be caused by a direct virus cytotoxicity in contrast to immune-mediated injury associated with hepatitis B virus. We have transfected HeLa and HepG2 continuous cell lines with a recombinant plasmid containing the hepatitis D antigen gene under the inducible control of the human metallothionein promoter. The addition of zinc to the cell culture medium then led to the expression of hepatitis D antigen associated with, in the short term, a significant reduction in the rate of RNA but not DNA synthesis and, in the longer term, cell death. The necrotic cells had pyknotic nuclei and shrunken eosinophilic cytoplasm; these necrotic cells resembled the apoptotic bodies seen in hepatitis D virus-related hepatitis. The level of hepatitis D antigen in individual cells that produced these changes was similar to the level of hepatitis D antigen in hepatocytes from a chimpanzee with acute hepatitis D virus infection. We conclude that the expression of hepatitis D antigen resulted in significant cytotoxic changes in these cells, providing strong support for the view that hepatitis D antigen may be specifically cytotoxic to infected hepatocytes in vivo.
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Cole et al. (1991) studied Hepatitis D virus infection. Expression of hepatitis D antigen was evaluated on Cytotoxicity (reduction in RNA synthesis and cell death). Expression of hepatitis D antigen in HeLa and HepG2 cell lines resulted in a significant reduction in RNA synthesis and subsequent cell death, providing direct evidence for viral cytotoxicity.
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