Abstract
To investigate the kinetic behavior of cadmium, we conducted a long-term oral administration experiment, using beagle dogs. The experimental animals were given a commercial diet and pelleted food containing 1, 3, 10, 50, and 100 mg of cadmium per day in the form of cadmium chloride for 8 yr. A single injection of cadmium (as CdCl2) into dogs was also performed in order to obtain fundamental kinetic information for a dog.
The kinetic behavior of cadmium in chronic experiment is described theoretically, using a two-compartment model. The model was selected based on the elimination pattern of cadmium from the blood in the single injection experiment. The parameters of the model were estimated from the acute and chronic experimental data. The theoretical value of the cumulative amount of cadmium excreted in urine agreed with the experimental one. This result suggests that the two-compartment model used in this study is useful to elucidate the kinetic behavior of cadmium after a long-term exposure to cadmium.
The terminal biological half-time in the two-compartment model was estimated at about 1 to 2 yr for both male and female dogs given 1, 3, 10, and 50 mg of cadmium, and for the male dog given 100 mg of cadmium, but only 0.3 to 0.5 yr for the female dog given 100 mg of cadmium. The amount of cadmium in the central compartment and tissue compartment increased continuously and then gradually reached a steady state. The amount of tissue compartment was much higher than that of the central compartment for each beagle dog.
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Matsuno, K., Kodama, Y. & Tsuchiya, K. Biological half-time and body burden of cadmium in dogs after a long-term oral administration of cadmium. Biol Trace Elem Res 29, 111–123 (1991). https://doi.org/10.1007/BF03032688
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DOI: https://doi.org/10.1007/BF03032688