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Toxicokinetics and Biliary Excretion of N-Nitrosodiethylamine in Rat Supplemented with Low and High Dietary Proteins.
Journal of Dietary Supplements 2018 December 5
Although biliary excretion is one of the biological elimination processes for foreign compounds, intake of high-protein diets was hypothesized to enhance their detoxification rates. Hence, this study investigates the effect of differential dietary protein intake on toxicokinetics and biliary excretion in rats following exposure to N-nitrosodiethylamine (NDEA) and aflatoxin B1 (AFB1). The animals were divided into five groups. Groups I and II were exposed to low and high dietary proteins following a single intraperitoneal dose of 43 µg NDEA/kg body weight, respectively. Groups III and IV were equally treated after a combined single intraperitoneal dose of 43 µg NDEA plus 0.022µg AFBI /kg body weight, respectively. Group V was fed with low-protein diets following a single intraperitoneal dose of 0.022µg AFB1/kg body weight. The experiment lasted 35 days. The bile excreted higher amounts of unchanged NDEA than nitrite. The groups placed on high-protein diets (HPD = 64%) eliminated higher amounts of the unchanged NDEA and nitrite than the lower-protein diet (LPD = 8%) groups. Furthermore, the animals fed with high dietary protein (HPD = 64%) depicted short half-life with corresponding increase in elimination rate constant. The presence of AFB1 heightened the excretion of bound NDEA with AFB1 than NDEA only. Generally, this study advocates that N-nitrosodiethylamine and the corresponding metabolites follow hepatobiliary system potentiated by high intake of dietary proteins.
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