Abstract
Fifteen patients with chronic hepatitis B were treated with adenine arabinoside (Ara-A) or human leukocyte interferon (HLI). Cellular immune response to hepatitis B virus surface antigen and antigens prepared from herpes simplex virus, varicella zoster virus, and cytomegalovirus was measured by a lymphocyte blast transformation assay and an assay for interferon production. Measurements were made before, during, and after antiviral treatment. Unlike patients convalescing from acute hepatitis B, only 2 of 15 patients with chronic hepatitis B had significant blast transformation to hepatitis B surface antigen. One such response occurred during the pretreatment period of HLI therapy, and the other was in a patient undergoing low-dose (<105 U/kg per day) HLI therapy. Mononuclear cell cultures were tested for interferon production in the presence of hepatitis B surface antigen. Cells from only 1 of 15 patients produced detectable levels of interferon. In contrast, all of these patients had normal cellular immune responses to herpesvirus antigens. Transformation responses to herpes antigens decreased three- to fivefold after patients were treated with >105 U of HLI per kg per day. Antiviral therapy with <105 U of HLI per kg per day or Ara-A did not produce a detectable depression of transformation response. Ara-A produced marked lymphocytopenia and a marked lymphocyte fragility after 5 or more days of therapy. In vitro Ara-A was toxic to lymphocytes at concentrations as low as 0.5 μg/ml. These changes in lymphocyte parameters may affect the outcome of antiviral therapy.
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Selected References
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