Abstract
Persistent hepadnavirus infection leads to oxidative stress and DNA damage through increased production of toxic oxygen radicals. In addition, hepadnaviral DNA integrations into chromosomal DNA can promote the process of hepatocarcinogenesis (M. Feitelson, Clin. Microbiol. Rev. 5:275-301, 1992). While previous studies have identified preferred integration sites in hepadnaviral genomes and suggested integration mechanisms (M. A. Buendia, Adv. Cancer Res. 59:167-226, 1992; C. E. Rogler, Curr. Top. Microbiol. Immunol. 168:103-141, 1991; C. Shih et al., J. Virol. 61:3491-3498, 1987), very little is known about the effects of agents which damage chromosomal DNA on the frequency of hepadnaviral DNA integrations. Using a recently developed subcloning approach to detect stable new integrations of duck hepatitis B virus (DHBV) (S. S. Gong, A. D. Jensen, and C. E. Rogler, J. Virol. 70:2000-2007, 1996), we tested the effects of increased chromosomal DNA damage induced by H2O2, or of the disturbance in DNA repair due to the inhibition of poly(ADP-ribose) polymerase (PARP), on the frequency of DHBV DNA integrations. Subclones of LMH-D21-6 cells, which replicate DHBV, were grown in the presence of various H2O2 concentrations and exhibited up...Continue Reading
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