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Tumours induced by Moloney murine sarcoma virus are clonal in rats, not clonal in mice

E D'Andrea1, L Tessarollo, C Menin

  • 1Institute of Oncology, Interuniversity Center for Cancer Research (C.I.R.C.), University of Padova, Italy.

Journal of Cancer Research and Clinical Oncology
|January 1, 1992
PubMed

Insights

Moloney murine sarcoma virus (M-MSV) causes tumors in mice and rats. Rat tumors show clonal v-mos integration and metastasis, unlike mouse tumors, suggesting different oncogenesis mechanisms.

Area of Science:

  • Oncology
  • Virology
  • Molecular Biology

Background:

  • Moloney murine sarcoma virus (M-MSV) is known to induce tumors in mice.
  • Rats exhibit lower susceptibility to M-MSV oncogenesis, with developing rhabdomyosarcomas showing distinct characteristics.
  • Understanding the molecular mechanisms of M-MSV-induced tumors across species is crucial for cancer research.

Purpose of the Study:

  • To investigate the oncogenic mechanisms of Moloney murine sarcoma virus (M-MSV) in rats compared to mice.
  • To analyze the integration pattern of the viral oncogene (v-mos) in M-MSV-induced tumors in both species.
  • To examine the clonal origin and metastatic behavior of rhabdomyosarcomas in rats.

Main Methods:

  • Southern blot analysis using a v-mos-specific probe to detect viral DNA integration.
  • Comparative analysis of M-MSV-induced tumors in mice and rats.
  • Investigation of Moloney murine leukemia virus (M-MuLV) involvement through DNA sequence analysis.

Main Results:

  • M-MSV-induced rat tumors exhibited oligo- or monoclonal patterns of exogenous v-mos integration, unlike non-clonal mouse tumors.
  • Metastases in rats originated from clones present in the primary tumor, indicating clonal expansion during progression.
  • Moloney murine leukemia virus (M-MuLV) was not implicated in the pathogenesis of most rat tumors studied.
  • Unintegrated linear M-MSV proviruses were detected in all M-MSV-induced mouse tumors.

Conclusions:

  • Exogenous v-mos integration and clonal expansion are key features of M-MSV-induced rhabdomyosarcoma progression in rats, differing from mouse tumor development.
  • The distinct patterns of viral integration and tumor progression in rats suggest species-specific oncogenic pathways.
  • These findings highlight the importance of viral integration patterns in understanding tumor development and metastasis.

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