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KSHV vPK inhibits Wnt signaling via preventing interactions between β-catenin and TCF4

Seho Cha1, Myung-Suk Kang2, Taegun Seo1

  • 1Department of Life Science, Dongguk University-Seoul, Goyang, 10326, Republic of Korea.

Biochemical and Biophysical Research Communications
|February 13, 2018
PubMed

Insights

Kaposi's sarcoma-associated herpesvirus protein kinase (vPK) inhibits the Wnt pathway by interacting with beta-catenin. This interaction disrupts beta-catenin binding to TCF4, reducing cell proliferation and tumor formation signals.

Area of Science:

  • Virology
  • Molecular Biology
  • Oncology

Background:

  • Viral proteins can disrupt host cellular signaling pathways.
  • The Wnt signaling pathway is crucial in development and cancer.
  • Beta-catenin is a key Wnt pathway component driving cell proliferation.

Purpose of the Study:

  • To investigate the role of Kaposi's sarcoma-associated herpesvirus protein kinase (vPK) in Wnt pathway regulation.
  • To elucidate the mechanism by which vPK affects beta-catenin function.

Main Methods:

  • Coimmunoprecipitation assays to detect protein interactions.
  • Chromatin immunoprecipitation assays to assess DNA binding.
  • Quantitative PCR to measure target gene expression (e.g., cyclin D1).

Main Results:

  • vPK inhibits Wnt signaling without altering beta-catenin levels or nuclear localization.
  • vPK directly interacts with beta-catenin.
  • vPK binding reduces beta-catenin's affinity for TCF binding regions and interaction with TCF4.
  • vPK overexpression decreases cyclin D1 mRNA levels.

Conclusions:

  • Kaposi's sarcoma-associated herpesvirus protein kinase (vPK) directly targets beta-catenin to inhibit Wnt signaling.
  • vPK disrupts the beta-catenin/TCF4 complex formation, impacting downstream gene transcription.
  • vPK's interaction with the Wnt pathway offers insights into viral oncogenesis.
Keywords:
Kaposi's sarcoma-associated herpesvirusTCF-dependent transcriptionViral protein kinaseWnt signaling pathwayβ-catenin

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