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Human & Experimental Toxicology
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Effect of thiamine on the cadmium–chelating capacity of thiol compounds

S K Tandon

Chemical Toxicology, Industrial Toxicology Research Centre, P.O. Box 80, Lucknow-226001, India

S Prasad

Industrial Toxicology Research Centre, Lucknow-226001, India

The influence of thiamine on the efficacy of meso-2,3-dimercaptosuccinic acid (DMSA), diethyldimercapto succinate (DEDMS), a mercapto-13-(2-furyl) acrylic acid (MFA) and a-mercapto-3-(2-thienyl) acrylic acid (MTA) to mobilize cadmium and reverse cadmium-induced biochemical alterations was investigated in cadmiumexposed rats. The thiamine coadministration enhanced the efficacy of MFA and MTA in reducing hepatic and renal burden of cadmium and that of DMSA and DEDMS in mobilizing hepatic cadmium. It also improved the efficacy of DMSA, DEDMS and MFAinreversingthe cadmium-induced increase in urinary alkaline phosphatase and aspartate and alanine amino transaminases. The combined treatment with thiamine and DMSA or MFA restricted the urinary loss of zinc and that with thiamine and DEDMS reduced the loss of fecal copper, a general effect of chelation. In conclusion, the administration of thiamine during chelation therapy in cadmium poisoning may be beneficial and more effective than thiol chelating agents alone, which needs to be confirmed in humans.

Key Words: cadmium intoxication • chelating agents • thiamine • essential elements • rat

Human & Experimental Toxicology, Vol. 19, No. 9, 523-528 (2000)
DOI: 10.1191/096032700668935303
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