Related Experiment Videos
Selective alteration of bovine neutrophil responses by recombinant bovine interleukin-1 beta
1National Animal Disease Center, U.S.D.A., Ames, IA 50010.
Insights
Recombinant bovine interleukin-1 beta (rBIL-1 beta) suppresses neutrophil migration but enhances oxidative responses to microbial antigens in cattle. This cytokine directly modulates key bovine neutrophil functions, impacting immune responses.
Area of Science:
- Veterinary Immunology
- Cellular Immunology
- Cytokine Research
Background:
- Neutrophils play a critical role in innate immunity against pathogens.
- Interleukin-1 beta (IL-1 beta) is a key inflammatory cytokine with diverse immune functions.
- Understanding cytokine effects on bovine immune cells is vital for animal health.
Purpose of the Study:
- To investigate the in vitro effects of recombinant bovine interleukin-1 beta (rBIL-1 beta) on bovine neutrophil functions.
- To determine if rBIL-1 beta modulates neutrophil migration, phagocytosis, and oxidative burst.
- To assess the impact of rBIL-1 beta on neutrophil responses to microbial stimuli.
Main Methods:
- Bovine peripheral blood neutrophils were isolated and exposed to varying concentrations of rBIL-1 beta.
- Neutrophil migration was assessed using an under agarose assay.
- Phagocytosis of Staphylococcus aureus and hydrogen peroxide (H2O2) production were measured.
- Elastase release and H2O2 production in response to opsonized zymosan were quantified.
Main Results:
- rBIL-1 beta induced a dose-dependent suppression of neutrophil migration.
- rBIL-1 beta did not affect Staphylococcus aureus ingestion or basal H2O2 production.
- Pretreatment with rBIL-1 beta enhanced opsonized zymosan-induced H2O2 production but not elastase release.
- Short exposure (15 min) to rBIL-1 beta was sufficient to modulate neutrophil functions.
Conclusions:
- rBIL-1 beta directly modulates specific bovine neutrophil functions in vitro.
- rBIL-1 beta suppresses neutrophil migration while augmenting oxidative metabolic responses to microbial antigens.
- These findings highlight rBIL-1 beta's role in regulating innate immune responses in cattle.
Abstract:
The effects of recombinant bovine interleukin-1 beta (rBIL-1 beta) upon in vitro bovine neutrophil functions were determined. Exposure of peripheral blood neutrophils to various concentrations of rBIL-1 beta induced dose dependent suppression of the phagocyte's ability to migrate under agarose. Preincubation of neutrophils with rBIL-1 beta did not influence their ability to ingest radiolabelled Staphylococcus aureus nor did it induce hydrogen peroxide production or elastase release. However, pretreatment of phagocytes with rBIL-1 beta did result in a dose-dependent enhancement of opsonized zymosan-induced H2O2 production. In contrast, rBIL-1 beta had no effect upon the ability of opsonized zymosan-stimulated neutrophils to release elastase from primary granules. Pretreatment of neutrophils with rBIL-1 beta for as little as 15 min was sufficient to induce suppression of migration and enhancement of opsonized zymosan-induced H2O2 production. These results suggest rBIL-1 beta is capable of directly modulating selected neutrophil activities. In addition, rBIL-1 beta appears to augment the phagocyte's oxidative metabolic responses to subsequent stimulation by microbial antigens.