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Secretion of interleukin-1 by bovine milk macrophages
I Politis1, B W McBride, J H Burton
1Department of Animal Science, McGill University, Ste Anne de Bellevue, Quebec.
Insights
Bovine monocytes and milk macrophages produce interleukin 1 (IL-1) when stimulated by lipopolysaccharide. However, milk macrophages secrete significantly less IL-1, potentially impairing their immune function.
Area of Science:
- Immunology
- Cell Biology
- Veterinary Science
Background:
- Monocytes and macrophages are critical immune cells involved in host defense.
- Interleukin 1 (IL-1) is a key cytokine mediating inflammatory and immune responses.
- Understanding immune cell function in bovine milk is crucial for animal health.
Purpose of the Study:
- To compare the sensitivity of bovine blood monocytes and milk macrophages to lipopolysaccharide (LPS) stimulation.
- To evaluate the production and secretion of interleukin 1 (IL-1) by these cells.
- To assess the implications of IL-1 production for immune cell function.
Main Methods:
- Isolation of bovine blood monocytes and milk macrophages.
- Culture of cells with varying concentrations of lipopolysaccharide (LPS).
- Measurement of intracellular and secreted IL-1 activity.
Main Results:
- Both monocytes and milk macrophages increased IL-1 production upon LPS stimulation, with maximal effect at 30 µg/ml.
- Monocytes released 76% of total IL-1, while milk macrophages released only 26%.
- Limited IL-1 secretion was observed in macrophages from both healthy and mastitic quarters.
Conclusions:
- Bovine milk macrophages exhibit reduced IL-1 secretion compared to blood monocytes.
- This limited secretion may compromise the ability of milk macrophages to activate lymphocytes.
- Further research is needed to fully elucidate the role of milk macrophages in bovine immunity.
Abstract:
The relative sensitivity of bovine blood monocytes and macrophages isolated from milk to lipopolysaccharide, with respect to interleukin 1 (IL-1) production, was evaluated. Addition of lipopolysaccharide (0 to 30 microgram/ml) to the culture medium resulted in increases in secreted and intracellular IL-1 activity for monocytes and milk macrophages, with maximal stimulation achieved at 30 micrograms of lipopolysaccharide/ml of medium. At this concentration of lipopolysaccharide, monocytes released 76% of the total IL-1, whereas milk macrophages released only 26% of the total IL-1 produced within the cell. Secretion of a small quantity of IL-1 was a common property of macrophages isolated from healthy and mastitic quarters. We concluded that limited secretion of IL-1 may render the milk macrophages less efficient in promoting lymphocyte activation.
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