Background/Aim: Whey protein is a mixture of globulins isolated from whey and mainly composed of β-lactoglobulin, α-lactoalbumin, and lactoferrin. In this study, whey protein was hydrolyzed using various proteases, and the macrophage activation was evaluated. Materials and Methods: Hydrolyzed whey protein was prepared using various proteases to evaluate phagocytic activity and cytokine productivity. Results: The results of SDS-PAGE and gel permeation chromatography (GPC) analysis indicated that the molecular weight of whey protein was reduced using various proteases. The hydrolyzed whey protein showed a concentration-dependent induction of macrophage phagocytic activity. In addition, the hydrolyzed whey protein significantly enhanced the production of the inflammatory cytokine, TNF-α. Production of the anti-inflammatory cytokine, IL-10, was not observed at concentrations up to 1 μg, but significant production was confirmed at 100 μg. Conclusion: Hydrolyzed whey protein can induce the phagocytic activity of macrophages and activation of the inflammatory/anti-inflammatory functions of the macrophages depends on the concentration of the hydrolyzed whey protein.
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