Summary auto-generated
This study evaluated the immunogenic potential of two varicella-zoster virus (VZV) proteins in strain 2 guinea-pigs: gpI, a major glycoprotein, and p170, a non-glycosylated protein. Animals received either infectious guinea-pig-adapted VZV or immunoaffinity-purified VZV proteins through subcutaneous injection. Researchers measured humoral immunity (antibody production) and cell-mediated immunity (T lymphocyte proliferation) using radioimmunoassay, immunoblot analysis, plaque reduction assays, and lymphocyte proliferation assays. Both gpI and p170 induced VZV-specific IgG antibodies and T lymphocyte responses. However, antibody and T lymphocyte responses declined more rapidly after protein immunization compared to infectious VZV, though they rebounded immediately following reimmunization. Only gpI elicited complement-dependent neutralizing antibodies, while p170 did not. The findings demonstrate that purified viral proteins can induce both humoral and cellular immunity, though viral replication appears necessary for sustained long-term immunity. These results provide background for developing subunit herpesvirus vaccines as alternatives to live attenuated vaccines.
Key findings
- Both VZV glycoprotein gpI and non-glycosylated protein p170 induced VZV-specific IgG antibodies and T lymphocyte proliferation in immunized guinea-pigs
- Antibody and cellular immune responses waned more rapidly after protein immunization compared to infectious VZV, but were rapidly restored upon reimmunization
- Only gpI elicited complement-dependent neutralizing antibodies; p170 did not produce neutralizing antibodies despite inducing antibody and T cell responses
- Infectious VZV produced more sustained immunity with peak responses occurring later than protein immunization, suggesting viral replication is important for persistent immunity
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