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Abstract
The objective of this study was to investigate the effect of purified soybean agglutinin on growth and immune function in rats. Thirty male Sprague-Dawley rats (77.8 ± 2.6 g) were individually fed casein-cornstarch based diets containing 0, 0.05, 0.10, 0.15 or 0.20% soybean agglutinin (w/w) during a 20-day experiment. Growth declined linearly with increasing the concentration of soybean agglutinin (p < 0.05). The proliferation of lymphocytes in spleen, lymph nodes and blood decreased with an increase in dietary soybean agglutinin (p < 0.05). The concentrations of interleukin-2, interferon-γ and tumor necrosis factor-
in plasma, spleen, and mesenteric lymph nodes as well as plasma concentrations of IgA, IgG and IgM also declined with increasing dose of soybean agglutinin (p < 0.05). The results show that dietary soybean agglutinin has negative effects on growth as well as both cell-mediated and humoral immune function of rats and appears to function in a dose-dependent manner.