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Nuclear factor-κB2 represses Sp1-mediated transcription at the CD99 promoter

Eun Kyung Lee1, Ji Hye Chae, Myung-Soo Kang

  • 1Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul 135-710, Korea.

Molecules and Cells
|November 16, 2011
PubMed

Insights

Epstein-Barr virus (EBV) LMP1 downregulates CD99 in Hodgkin's lymphoma (HL) by activating NF-κB2. This pathway, involving Sp1 binding sites, is crucial for pathogenic Reed-Sternberg cell development.

Area of Science:

  • Molecular Biology
  • Oncology
  • Virology

Background:

  • CD99 antigen downregulation is linked to Hodgkin's lymphoma (HL) pathogenesis.
  • Epstein-Barr virus (EBV) LMP1 protein influences NF-κB signaling and Sp1 transcriptional activity.
  • Reed-Sternberg cells, characteristic of HL, are associated with CD99 downregulation.

Purpose of the Study:

  • To investigate the role of EBV LMP1 and NF-κB signaling in CD99 promoter regulation.
  • To identify specific NF-κB subunits involved in CD99 repression.
  • To elucidate the mechanism by which LMP1-mediated NF-κB affects CD99 transcription.

Main Methods:

  • Reporter gene assays to measure CD99 promoter activity.
  • Transfection experiments with EBV LMP1, NF-κB subunits, and kinase mutants.
  • Analysis of CD99 promoter activity in wild-type and knockout mouse embryonic fibroblasts (MEFs).
  • Site-directed mutagenesis and synthetic reporter assays targeting Sp1-binding sites.

Main Results:

  • EBV LMP1, CD30, CD40, and NF-κB-inducing kinase (NIK) repress the CD99 promoter.
  • NF-κB2 (p52) subunit is essential for LMP1-mediated CD99 repression.
  • LMP1-mediated repression of CD99 requires NF-κB2 and functional Sp1-binding sites.
  • Basal CD99 promoter activity is elevated in IKKα and IKKβ deficient cells.

Conclusions:

  • NF-κB2 activation by EBV LMP1 plays a critical role in CD99 gene transcription repression.
  • The findings highlight a specific molecular mechanism contributing to HL pathogenesis.
  • Targeting the LMP1-NF-κB2-Sp1 pathway could offer therapeutic strategies for Hodgkin's lymphoma.

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