Secretion of interleukin-1 by bovine milk macrophages

Politis, I.; McBride, B.W.; Burton, J.H.; Zhao, X.; Turner, J.D.

Secretion of interleukin-1 by bovine milk macrophages

1991

Politis, I. | McBride, B.W. | Burton, J.H. | Zhao, X. | Turner, J.D.

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 theculture medium resulted in increases in secreted and intra-cellular IL-1 activity for monocytes and milk macrophages, with maximal stimulation achieved at 30 microgram oflipopolysaccharide/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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