Abstract
The hypothesis that in tumor-bearing animals an increase of host hepatic zinc metallothionein (Zn-MT) causes a restriction of zinc in the tumor tissue was studied.
Three types of tumors were induced in laboratory mice by cell transplant. Tumor growth appears to be inhibited under zinc-deficient conditions, even in cases where zinc deficiency was started after tumor cell transplant.
The survival times of tumor-bearing mice were prolonged by administration of cadmium chloride, which induces the synthesis of a combined zinc-cadmium metallothionein derivative in the host liver, but not in the tumor tissue, leading to an increase of hepatic zinc in the treated animals. The uptake of65Zn by the liver of Cd-treated, tumor bearing mice was significantly higher than that of controls whereas uptake of65Zn by tumor cells was significantly higher in controls than in the treated animals.
These results suggest that restriction of zinc intake suppresses tumor growth.
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Takeda, A., Goto, K. & Okada, S. Zinc depletion suppresses tumor growth in mice. Biol Trace Elem Res 59, 23–29 (1997). https://doi.org/10.1007/BF02783226
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DOI: https://doi.org/10.1007/BF02783226