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FeLV-induced immunosuppression through alterations in signal transduction: changes in intracellular free calcium
K A Wright1, C S Dezzutti, M G Lewis
1Ohio State University, Department of Veterinary Pathobiology, Columbus 43210.
Abstract:
Feline leukemia virus (FeLV) is a retrovirus with immunosuppressive properties. The mechanism(s) of immunosuppression is unknown. Calcium has been shown to be a second messenger in cellular activation and regulation. This study was designed to determine whether FeLV alters intracellular free calcium (IFC) levels in an FeLV-infected feline lymphoid cell line. Control cells and FeLV-infected cells were exposed to Concanavalin A, formyl-L-methionyl-L-leucyl-L-phenylalanine, and leukotriene B4. The basal IFC and post-stimulation IFC levels were recorded using Fura 2 AM and a luminescence spectrometer. Data collected indicate that FeLV-infected cells have a higher basal level of IFC and a reduced amount of increase in IFC after stimulation when compared to the control cells. The results would seem to indicate retrovirus-mediated interference occurring in the intracellular calcium signaling process.
Insights
Feline leukemia virus (FeLV) infection alters intracellular calcium signaling in feline lymphoid cells. Infected cells show higher basal calcium and reduced calcium response to stimulation, suggesting a novel immunosuppression mechanism.
Area of Science:
- Immunology
- Virology
- Cell Biology
Background:
- Feline leukemia virus (FeLV) is a retrovirus known to cause immunosuppression in cats.
- The precise mechanisms underlying FeLV-induced immunosuppression remain largely unknown.
- Intracellular free calcium (IFC) acts as a critical second messenger in cellular activation and immune regulation.
Purpose of the Study:
- To investigate the impact of FeLV infection on intracellular free calcium (IFC) levels in feline lymphoid cells.
- To determine if FeLV alters basal and stimulated IFC levels.
Main Methods:
- Utilized an FeLV-infected feline lymphoid cell line and control cells.
- Stimulated cells with Concanavalin A, formyl-L-methionyl-L-leucyl-L-phenylalanine, and leukotriene B4.
- Measured basal and post-stimulation IFC using Fura 2 AM and a luminescence spectrometer.
Main Results:
- FeLV-infected cells exhibited significantly higher basal IFC levels compared to control cells.
- FeLV-infected cells demonstrated a diminished increase in IFC upon stimulation.
- These findings suggest FeLV interferes with calcium signaling pathways.
Conclusions:
- FeLV infection alters intracellular calcium homeostasis in feline lymphoid cells.
- The observed changes in IFC levels may contribute to the immunosuppressive properties of FeLV.
- Retrovirus-mediated interference in intracellular calcium signaling is a potential mechanism for FeLV pathogenesis.