An evaluation of tissue metallothionein and genetic resistance to cadmium toxicity in mice

Toxicology and Applied Pharmacology
C V Nolan, Z A Shaikh

Abstract

The role of metallothionein or metallothionein-like proteins (MT) in genetic resistance to the testicular and hepatic toxicity of cadmium was examined in inbred strains of mice. Mice of two strains resistant (AJ and C3H/HEJ) or susceptible (129J and DBA/2J) to cadmium-induced testicular necrosis were administered sc 30 mumol CdCl2/kg. The uptake of cadmium and the induction of MT in tissues were determined after 6 hr. The results showed that accumulation of cadmium in liver and kidney tissues of the four strains was very similar. MT levels were elevated up to 20-fold in the liver and up to almost 8-fold in the kidney, resulting in cadmium to MT molar ratios of 6.7 to 10.0 in the liver and 1.2 to 1.9 in the kidney. The greatest increase in hepatic MT as well as the cadmium to MT ratio was in the C3H/HEJ strain which is susceptible to cadmium-induced hepatotoxicity. Testicular cadmium levels were significantly elevated in the two susceptible strains. The basal levels of MT-like protein in the testis were generally higher than those in the kidney. Although, only the testis of 129J (susceptible) showed an increase in this protein after 6 hr, both susceptible strains injected with cadmium had significantly higher levels of the prote...Continue Reading

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