Related Experiment Videos
Ecotropic and mink cell focus-forming murine leukemia viruses integrate in mouse T, B, and non-T/non-B cell lymphoma
Abstract:
Structures of somatically acquired murine leukemia virus (MuLV) genomes present in the DNA of a large panel of MuLV-induced C57BL and BALB/c B and non-T/non-B cell lymphomas were compared with those present in MuLV-induced T-cell lymphomas induced in the same low-"spontaneous"-lymphoma-incidence mice. Analyses were performed with probes specific for the gp70, p15E, and U3-long terminal repeat (LTR) regions of ecotropic AKV MuLV and a mink cell focus-forming virus (MCF)-LTR probe annealing with U3-LTR sequences of a unique endogenous xenotropic MuLV, which also hybridizes with U3-LTR sequences of a substantial portion of somatically acquired MCF genomes in spontaneous AKR thymomas. The DNAs of both T- and B-cell tumors induced by neonatal inoculation with the highly oncogenic C57BL-derived MCF 1233 virus predominantly contain integrated MCF proviruses. In contrast, the DNAs of more slowly developing B and non-T/non-B cell lymphomas induced by poorly oncogenic ecotropic or MCF C57BL MuLV isolates mostly contain somatically acquired ecotropic MuLV genomes. Approximately 50% of the spontaneous C57BL lymphoma DNAs contain somatically acquired MuLV genomes. None of the integrated MuLV proviruses annealed with the MCF-LTR probe, which indicates a clear difference in LTR structure with a substantial portion of the somatically acquired MuLV genomes present in the DNA of spontaneous AKR thymomas. This study stresses a dominant role of MuLV with ecotropic gp70 and LTR sequences in the development of slowly arising MuLV-induced B and non-T/non-B cell lymphomas.
Insights
Murine leukemia virus (MuLV) genomes in B-cell lymphomas primarily feature ecotropic MuLV, while T-cell lymphomas contain MCF MuLV. This highlights the distinct roles of different MuLV types in lymphoma development.
Area of Science:
- Virology
- Oncology
- Molecular Biology
Background:
- Murine leukemia virus (MuLV) is implicated in various lymphomas.
- Different MuLV strains and their genomic structures may influence oncogenesis.
- Understanding MuLV integration is crucial for deciphering lymphoma development.
Purpose of the Study:
- To compare MuLV genome structures in different lymphoma types (T-cell vs. B/non-T/non-B cell).
- To investigate the role of specific MuLV regions (gp70, p15E, LTR) in oncogenesis.
- To differentiate between endogenous and somatically acquired MuLV genomes in tumors.
Main Methods:
- Analysis of MuLV genome structures in tumor DNA using specific probes.
- Hybridization techniques targeting gp70, p15E, and U3-long terminal repeat (LTR) regions.
- Comparison of MuLV genomes in experimentally induced and spontaneous lymphomas.
Main Results:
- T-cell lymphomas predominantly contain integrated mink cell focus-forming virus (MCF) proviruses.
- B and non-T/non-B cell lymphomas mostly harbor somatically acquired ecotropic MuLV genomes.
- Spontaneous lymphomas show distinct LTR structures compared to experimentally induced ones.
Conclusions:
- Ecotropic MuLV with specific gp70 and LTR sequences plays a dominant role in slowly developing B and non-T/non-B cell lymphomas.
- MCF MuLV is more associated with rapidly developing T-cell lymphomas.
- Distinct MuLV genomic structures correlate with different lymphoma types and development rates.