Abstract
This study explored the potential toxicity of Cd on the Zn bone depletion in prenatal bone formation. Female rats received either tap water, Cd, Zn, or Cd + Zn in their drinking water during gestation, and some markers of bone formation were studied in their fetuses removed at the 20th day of pregnancy (GD20). Cd exposure induced maternal hypozincemia and Zn depletion in the femur of the fetuses. A striking inhibition of bone formation in fetuses, expressed by decreases in femur length, width, and area, by the shortening of diaphysis, and by a decrease in length and area of distal and proximal proliferative zones, was observed in fetuses from Cd-exposed mothers. At the molecular level, Cd caused upregulation of MT-1 and ZIP2 genes and significantly depressed the expression of the ZnT5, colα1, osteocalcin, and ALP genes in the femur. Interestingly, Zn treatment ameliorated the Cd-induced maternal hypozincemia and femoral changes and partially restored the normal histomorphometry of the femur. These results suggest that the observed toxic effects of Cd are, at least in part, mediated by the disruption of maternal Zn metabolism during pregnancy leading to Zn depletion and thus to perturbation of prenatal bone formation.
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This research was supported by the Ministry of Higher Education, Scientific Research and Technology of Tunisia. The funding sources were not involved in the design of the study, or collection and analysis of data. The authors declare no competing financial interests or conflicts of interest. The authors would like to thank Pr Martine Cohen-Solal, Director of the Inserm U1132 unit, for his assistance and his permission to use the HistoLab software for the fetal femur histomorphometric analyses.
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Boughammoura, S., Chemek, M., Mimouna, S.B. et al. Involvement of Zn Depletion in Cd-Induced Toxicity on Prenatal Bone Formation in Rat. Biol Trace Elem Res 180, 70–80 (2017). https://doi.org/10.1007/s12011-017-0981-7
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DOI: https://doi.org/10.1007/s12011-017-0981-7