Nutrition Research and Practice

The Korean Nutrition Society (한국영양학회)
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Effect of Chlorella vulgaris intake on cadmium detoxification in rats fed cadmium

  • Kim, You-Jin (Department of Nutritional Science and Food Management, Ewha Womans University) ;
  • Kwon, Sang-Hee (Department of Nutritional Science and Food Management, Ewha Womans University) ;
  • Kim, Mi-Kyung (Department of Nutritional Science and Food Management, Ewha Womans University)
  • Published : 2009.06.30
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Abstract

The aim of this study was to investigate if dietary Chlorella vulgaris(chlorella) intake would be effective on cadmium(Cd) detoxification in rats fed dietary Cd. Fourteen-week old male Sprague-Dawley(SD) rats weighing $415.0{\pm}1.6\;g$ were randomly divided into two groups and fed slightly modified American Institute of Nutrition-93 Growing(AIN-93G) diet without(n=10) or with(n=40) dietary Cd(200 ppm) for 8 weeks. To confirm alteration by dietary Cd intake, twenty rats fed AIN-93G diet without(n=10) and with(n=10) dietary Cd were sacrificed and compared. Other thirty rats were randomly blocked into three groups and fed slightly modified AIN-93G diets replacing 0 (n=10), 5 (n=10) or 10% (n=10) chlorella of total kg diet for 4 weeks. Daily food intake, body weight change, body weight gain/calorie intake, organ weight (liver, spleen, and kidney), perirenal fat pad and epididymal fat pad weights were measured. To examine Cd detoxification, urinary Cd excretion and metallothonein (MT) concentrations in kidney and intestine were measured. Food intake, calorie intake, body weight change, body weight gain/calorie intake, organ weight and fat pad weights were decreased by dietary Cd intake. Urinary Cd excretion and MT concentrations in kidney and small intestine were increased by dietary Cd. After given Cd containing diet, food intake, calorie intake, body weight change, body weight gain/calorie intake, organ weights and fat pad weights were not influenced by dietary chlorella intake. Renal MT synthesis tended to be higher in a dose-dependent manner, but not significantly. And chlorella intake did not significantly facilitate renal and intestinal MT synthesis and urinary Cd excretion. These findings suggest that, after stopping cadmium supply, chlorella supplementation, regardless of its percentage, might not improve cadmium detoxification from the body in growing rats.

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