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Evaluation of an Anti-Inflammatory Factor Derived from Hyperimmunized Cows 1

Abstract An anti-inflammatory factor isolated from milk of hyperimmunized cows was analyzed in vitro and in vivo. Macrophages collected from lacteal secretions of a unimmunized nonlactating cow showed increased ability to kill phagocytosed Staphylococcus aureus when incubated with the anti-inflammatory factor. Mice injected intraperitoneally with 10 mg/kg of anti-inflammatory factor demonstrated an increased LD50 to S. aureus when challenged intraperitoneally. Injected mice also demonstrated significantly (P < 0.05) less mammary inflammation and involution and increased clearance of S. aureus when challenged intramammarily. Quantitative histologic analysis of mammary tissues from mice injected with antiinflammatory factor demonstrated significantly (P < 0.05) more lumen, less interalveolar connective tissue, and less leukocytic infiltration compared with control mice. Mammary glands of mice injected with anti-inflammatory factor and challenged with S. aureus also contained fewer colony-forming units than control mice. The product appeared to exert its effect on the nonspecific defense system via modulation of leukocyte function.