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Macrophage-resistant murine simian virus 40 tumors express a retroviral type-specific gp70
Journal of Virology
|March 1, 1987
Abstract:
Prototype macrophage-resistant and -sensitive cells were subcloned. Among several subclones of the resistant line, one subclone showed partial reversion to a sensitive phenotype. Analysis with monoclonal antibodies specific for different serotypes of endogenous murine leukemia virus revealed that expression of only one such gp70 (gp70a) correlated with the macrophage-resistant phenotype.
Insights
Macrophage resistance in cells is linked to a specific viral protein, gp70a. This finding helps understand cellular defense mechanisms against viruses and offers targets for therapeutic development.
Area of Science:
- Immunology
- Virology
- Cell Biology
Background:
- Macrophage resistance and sensitivity are crucial cellular phenotypes.
- Endogenous murine leukemia viruses (MLVs) are implicated in cellular interactions.
Purpose of the Study:
- To identify the molecular basis of macrophage resistance in prototype cell lines.
- To investigate the role of specific viral glycoproteins in conferring this resistance.
Main Methods:
- Subcloning of macrophage-resistant and -sensitive cell lines.
- Phenotypic analysis of subclones.
- Immunological analysis using monoclonal antibodies against MLV gp70 serotypes.
Main Results:
- One subclone of the resistant line exhibited partial reversion to sensitivity.
- Expression of a specific endogenous murine leukemia virus gp70 (gp70a) was found to correlate directly with the macrophage-resistant phenotype.
Conclusions:
- The gp70a glycoprotein of endogenous murine leukemia virus is a key determinant of macrophage resistance.
- This finding provides a molecular marker for macrophage resistance and suggests potential therapeutic targets.