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J Virol, July 1998, p. 6083-6091, Vol. 72, No. 7
0022-538X/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

T-Cell Response to Woodchuck Hepatitis Virus (WHV) Antigens during Acute Self-Limited WHV Infection and Convalescence and after Viral Challenge

Stephan Menne,1,dagger Jan Maschke,2,dagger Mengji Lu,1 Hans Grosse-Wilde,2 and Michael Roggendorf1,*

Institute of Virology1 and Institute of Immunology,2 University of Essen, D-45122 Essen, Germany

Received 29 December 1997/Accepted 1 April 1998

The infection of woodchucks with woodchuck hepatitis virus (WHV) provides an experimental model to study early immune responses during hepadnavirus infection that cannot be tested in patients. The T-cell response of experimentally WHV-infected woodchucks to WHsAg, rWHcAg, and WHcAg peptides was monitored by observing 5-bromo-2'-deoxyuridine and [2-3H]adenine incorporation. The first T-cell responses were directed against WHsAg 3 weeks after infection; these were followed by responses to rWHcAg including the immunodominant T-cell epitope of WHcAg (amino acids 97 to 110). Maximal proliferative responses were detected when the animals seroconvered to anti-WHs and anti-WHc (week 6). A decrease in the T-cell response to viral antigens coincided with clearance of viral DNA. Polyclonal rWHcAg-specific T-cell lines were established 6, 12, 18, and 24 weeks postinfection, and their responses to WHcAg peptides were assessed. Five to seven peptides including the immunodominant epitope were recognized throughout the observation period (6 months). At 12 months after infection, T-cell responses to antigens and peptides were not detected. Reactivation of T-cell responses to viral antigens and peptides occurred within 7 days after challenge of animals with WHV. These results demonstrate that a fast and vigorous T-cell response to WHsAg, rWHcAg, and amino acids 97 to 110 of the WHcAg occurs within 3 weeks after WHV infection. The peak of this response was associated with viral clearance and may be crucial for recovery from infection. One year after infection, no proliferation of T cells in response to antigens was observed; however, the WHV-specific T-cell response was reactivated after challenge of woodchucks with WHV and may be responsible for protection against WHV reinfection.

* Corresponding author. Mailing address: Institut für Virologie, Universitätsklinikum Essen, Hufelandstr. 55, D-45122 Essen, Germany. Phone: 49-201-723-3550. Fax: 49-201-723-5929. E-mail: roggendorf{at}uni-essen.de.

dagger Present address: Department of Clinical Sciences, Cornell University, Ithaca, NY 14853.

J Virol, July 1998, p. 6083-6091, Vol. 72, No. 7
0022-538X/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.


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