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JC virus large T protein transforms rodent cells but is not involved in human medulloblastoma

H Hayashi1, S Endo, S Suzuki

  • 1Laboratory of Molecular and Cellular Pathology, Hokkaido University School of Medicine, Sapporo, Japan.

Neuropathology : Official Journal of the Japanese Society of Neuropathology
|June 9, 2001
PubMed

Insights

JC virus (JCV) large T antigen (LT) transforms rodent cells, but this study found no evidence linking JCV to human medulloblastoma. This research clarifies LT

Area of Science:

  • Virology
  • Oncology
  • Molecular Biology

Background:

  • Polyomaviruses, including JC virus (JCV), Simian virus 40 (SV40), and BK virus (BKV), are neuro-oncogenic in rodents via large T antigen (LT).
  • The function of LT is complex due to co-expression with small t antigen (st) from the same mRNA.
  • Understanding LT's role independent of st is crucial for elucidating its oncogenic mechanisms.

Purpose of the Study:

  • To isolate and study the function of JC virus (JCV), SV40, and BK virus (BKV) large T antigens (LT) without the influence of small t antigen (st).
  • To investigate the transforming capacity of LT alone in rodent cells.
  • To determine the potential involvement of JCV in human medulloblastoma.

Main Methods:

  • Constructed plasmids to express LT only, by deleting the st splicing region.
  • Established stable cell lines expressing only JCV LT, SV40 LT, and BK LT.
  • Assessed cell transformation via soft agar colony formation assays and analyzed human medulloblastoma tissues using PCR, Southern blotting, and immunohistochemistry.

Main Results:

  • LT alone demonstrated transforming capacity in rodent cells, with efficiency varying: SV40LT > BKLT > JCLT.
  • No JCV genome or LT protein was detected in human medulloblastoma samples using multiple sensitive methods.
  • JCV LT possesses transforming activities in rodent cells, but lacks association with human medulloblastoma.

Conclusions:

  • JC virus (JCV) large T antigen (LT) exhibits transforming capabilities in rodent cells independently of small t antigen (st).
  • This study provides no evidence for the involvement of JCV in the development of human medulloblastoma.
  • The findings clarify the distinct transforming potential of polyomavirus LT antigens and their etiological relevance in human cancers.

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