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Published on: June 13, 2011
Circulating immune complexes in bovine leukemia virus (BLV)-infected cattle
H Ungar-Waron1, J Brenner, R Paz
1Department of Immunology, Kimron Veterinary Institute, Beit Dagan, Israel.
Insights
Circulating immune complexes (ICs) in cattle infected with bovine leukemia virus (BLV) were analyzed. Findings suggest age-related changes in the composition of these immune complexes, potentially indicating disease progression.
Area of Science:
- Veterinary Immunology
- Virology
- Immunochemistry
Background:
- Bovine leukemia virus (BLV) is a significant pathogen in cattle.
- Circulating immune complexes (ICs) are implicated in various immune responses and diseases.
- Understanding IC composition in BLV infection is crucial for assessing disease status.
Purpose of the Study:
- To detect and characterize immune complexes in BLV-seropositive cattle.
- To investigate the influence of age and infection stage on IC composition.
- To quantify bovine leukemia virus antigens, IgG, and IgM within ICs.
Main Methods:
- Immune complexes precipitated using polyethylene glycol (PEG).
- Dissociation and solubilization of ICs with sodium dodecyl sulphate.
- Quantification of BLV antigens, IgG, and IgM via enzyme-linked immunosorbent assay (ELISA).
Main Results:
- ICs were detected in BLV-seropositive cattle sera.
- No significant difference in mean IgG and IgM levels between BLV-positive and negative animals.
- Significant differences in IgG/IgM ratios were observed between age groups in BLV-positive cattle.
Conclusions:
- Age appears to influence the composition of ICs in BLV-infected cattle.
- An increased contribution of IgM to ICs may occur with age or disease progression in BLV infection.
- Further research is needed to elucidate the role of age-related IC changes in BLV pathogenesis.
Abstract:
Circulating immune complexes (ICs) were detected in the sera of bovine leukemia virus (BLV)-seropositive cattle. Immune complexes were precipitated in 2.5% polyethylene glycol (PEG) and further dissociated. Bovine leukemia virus antigens, IgG and IgM molecules were detected after solubilization in the presence of sodium dodecyl sulphate, and quantitated by enzyme-linked immunosorbent assay (ELISA) assays. Mean values of IgG and IgM in BLV-containing ICs did not significantly differ from those obtained from ICs originating from BLV-seronegative animals. However, differences were found in the composition of ICs from older BLV-positive animals as compared to those obtained from young animals. The ratio of IgG/IgM was 5.02 in animals aged 5-10 years, while this ratio was 11.66 in animals of less than 5 years of age and 10.19 in controls. This might indicate a possible increase in the contribution of IgM molecules to the structural composition of ICs in BLV-infected cattle as related to age or stage of infection.
