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Epstein-Barr viral gene expression in B-lymphocytes

F Schwarzmann1, M Jäger, M Hornef

  • 1Institut für Medizinische Mikrobiologie and Hygiene, Universität Regensburg, Germany. Fritz.Schwarzmann@klinik.uni-regensburg.de

Leukemia & Lymphoma
|July 21, 1998
PubMed
Summary

Epstein-Barr virus (EBV) persists by hiding in B-cells, which are also key sites for virus production during infectious mononucleosis. Immune control limits EBV replication after infection, but chronic cases show insufficient control.

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Area of Science:

  • Virology
  • Immunology
  • Cell Biology

Background:

  • Epstein-Barr virus (EBV) establishes lifelong persistence through reservoirs, enabling reactivation and transmission.
  • Epithelial cells and B-lymphocytes are crucial for EBV's lifecycle, with epithelial cells supporting lytic replication and B-cells undergoing latent infection.
  • The precise locations of EBV reservoirs and lytic replication sites remain unclear.

Purpose of the Study:

  • To investigate the role of peripheral blood B-cells in EBV replication during primary infection and persistent states.
  • To understand the immunological control mechanisms governing EBV lytic replication.
  • To characterize EBV strains associated with chronic active infections.

Main Methods:

  • Reverse transcription PCR (RT-PCR) to detect viral transcripts.

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  • Immunohistochemistry to identify viral presence in specific cell types.
  • Serological analysis to assess EBV reactivation.
  • Analysis of viral gene expression, including BZLF-1, in chronic infections.

    • Main Results:

    • Peripheral blood B-cells are a major site of EBV production during infectious mononucleosis.
    • While permissive B-cells persist post-convalescence, efficient immune control prevents lytic replication.
    • EBV reactivation correlates with lytic transcripts, indicating distinct sites for acute and persistent infection virus production.
    • A specific EBV strain with a lytic phenotype was identified in chronic active infection, showing impaired B-cell immortalization linked to BZLF-1 expression.

    Conclusions:

    • Peripheral blood B-cells are critical for EBV replication during acute infection (infectious mononucleosis).
    • Effective immune surveillance controls EBV lytic replication post-acute infection.
    • Insufficient control of immune surveillance or viral gene regulation contributes to chronic active EBV infections.
    • EBV strains in chronic infections may exhibit altered replication and latency characteristics.