Studies on the fate of poisonous metals in experimental animal, (2)

Three doses of cadmium chloride solutions (1, 5 and 10 mg/kg/day) were given orally and repeatedly to 3 groups of male rats (27--28 rats per 1 group) for 20 days. In 1 mg/kg group, depression of daily gain of body weight was observed to some extent after 13th day, and significant depression was noted earlier in 5 and 10 mg/kg groups. Decrease of daily food and water consumption was observed after 10--12th day, and mortality of each group until 21st day was 2/27, 8/27 and 9/28, respectively. At 21st day, solution of sup(115m)CdCl2(2μCi/mg CdCl2/2 ml/kg) was given orally to investigate the alternative distribution of this metal, dissecting the animals and measuring the radioactivities. Comparing with the control group, increase of adrenal weight, decrease of seminal vesicle weight, relaxation of gastrointestinal tract and increase of the contents of the tract were found in every pretreated group. Thicker distribution of sup(115m)Cd were seen in many organs and tissues, including blood, or every pretreated group compared with control group, however, the concentration in liver and bone was lower contrarily. Especially, the amount of remaining sup(115m)Cd in stomach was more in 1 and 5 mg/kg groups than the control group, and the fact suggested the delay of gastric emptying rate. (auth.)