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Retroviral heterogeneity in mouse lymphomas.
M P Colombo1, G Ferrari, G Parmiani
1Istituto Nazionale per lo Studio e la Cura dei Tumori, Milano, Italy.
Oncogene
|April 1, 1988
Summary
Tumor provirus modifications can create new antigenic variants. This study found new retroviral integration sites in lymphomas, linking mouse mammary tumor virus (MMTV) integration to immune cell susceptibility and novel antigen expression.
Area of Science:
- Oncology
- Virology
- Immunology
Background:
- Tumorigenesis can involve modifications to proviral DNA.
- These modifications may lead to the emergence of tumor-specific antigenic variants.
- Retroviruses are implicated in various cancers and immune system interactions.
Purpose of the Study:
- To investigate if provirus modifications in tumors lead to antigenic variants.
- To compare retroviral sequences in lymphomas expressing novel histocompatibility antigens.
- To explore the relationship between retroviral integration and tumor immune recognition.
Main Methods:
- Southern blot analysis was used to examine restriction fragment length patterns.
- Analysis included mouse mammary tumor virus (MMTV), murine leukemia virus, and xenotropic/MCF-related sequences.
- A panel of Balb/c and C57BL/6 lymphomas was studied.
Main Results:
- All analyzed tumors showed differences in amplification and novel integration sites of retroviral sequences.
- The number of new retroviral sequences varied depending on the specific retroviral sequence.
- Integration of new MMTV sequences correlated with susceptibility to lysis by syngeneic alloactivated lymphocytes.
Conclusions:
- Retroviral sequence modifications, including novel integration sites, are common in lymphomas.
- Mouse mammary tumor virus (MMTV) integration is associated with increased susceptibility to immune-mediated lysis.
- Retroviruses may induce the expression of novel histocompatibility antigens on tumor cells, influencing immune surveillance.