Epstein-Barr virus latent gene expression in primary effusion lymphomas containing Kaposi's sarcoma-associated herpesvirus/human herpesvirus-8 Academic Article uri icon

Overview

MeSH Major

  • DNA-Binding Proteins
  • Epstein-Barr Virus Nuclear Antigens
  • Gene Expression Regulation, Neoplastic
  • Gene Expression Regulation, Viral
  • Herpesviridae Infections
  • Herpesvirus 4, Human
  • Herpesvirus 8, Human
  • Lymphoma, Non-Hodgkin
  • Trans-Activators
  • Tumor Virus Infections
  • Viral Matrix Proteins
  • Viral Proteins

abstract

  • Primary effusion (body cavity-based) lymphoma (PEL) is a recently recognized subtype of malignant lymphoma that exhibits distinctive clinical and biological features, most notably its usual infection with the Kaposi's sarcoma-associated herpesvirus (KSHV). The vast majority of cases also contain Epstein-Barr virus (EBV). This dual viral infection is the first example of a consistent dual herpesviral infection in a human neoplasm and provides a unique model to study viral interactions. We analyzed the pattern of EBV latent gene expression to determine the pathogenic role of this agent in PELs. We examined five PELs coinfected with EBV and KSHV by reverse transcription-polymerase chain reaction (RT-PCR), in situ hybridization, and immunohistochemistry. EBER1 mRNA, a consistent marker of viral latency, was positive in all PEL cases, although at lower levels than in the non-PEL controls due to EBER1 expression by only a variable subset of lymphoma cells. Qp-initiated mRNA, encoding only EBNA1 and characteristic of latencies I and II, was positive in all PEL cases. Wp- and Cp-initiated mRNAs, encoding all EBNAs and characteristic of latency III, were negative in all cases. LMP1 mRNA, expressed in latencies II and III, was present in three cases of PEL, although at very low levels that were not detectable at the protein level by immunohistochemistry. Low levels of LMP2A mRNA were detected in all cases. BZLF1, an early-intermediate lytic phase marker, was weakly positive in four cases, suggesting a productive viral infection in a very small proportion of cells, which was confirmed by ZEBRA antigen expression. Therefore, PELs exhibit a restricted latency pattern, with expression of EBNA1 in all cases, and low LMP1 and LMP2A levels.

publication date

  • August 1997

Research

keywords

  • Academic Article

Identity

Language

  • eng

PubMed ID

  • 9242551

Additional Document Info

start page

  • 1186

end page

  • 91

volume

  • 90

number

  • 3