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Low iron diet and parenteral cadmium exposure in pregnant rats: the effects on trace elements and fetal viability

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Abstract

The effects of latent iron deficiency combined with parenteral subchronic or acute cadmium exposure during pregnancy on maternal and fetal tissue distribution of cadmium, iron and zinc, and on fetal viability were evaluated. Timed-pregnant Sprague-Dawley rats were fed on semisynthetic test diets with either high iron (240 mg kg) or low iron (10 mg kg), and concomitantly exposed to 0, 3 or 5 mg cadmium (as anhydrous CdCl2) per kilogram body weight. Animals were exposed to cadmium from gestation day 1 through 19 by subcutaneously implanted mini pumps (Subchronic exposure) or on gestation day 15 by a single subcutaneous injection (Acute exposure). All rats were killed on gestation day 19. Blood samples, selected organs and fetuses were removed and prepared for element analyses by atomic absorption spectrometry. Low iron diet caused decreases in maternal body weight, maternal and fetal liver weights, placental weights and tissue iron concentrations. By cadmium exposure, both subchronic and acute, tissue cadmium concentrations were increased and the increase was dose-related, maternal liver and kidney zinc concentrations were increased, and fetal zinc concentration was decreased. Cadmium concentration in maternal liver was additionally increased by low iron diet. Acute cadmium exposure caused lower maternal body and organ weights, high fetal mortality, and decreased fetal weights of survivors. In conclusion, parenteral cadmium exposure during pregnancy causes perturbations in essential elements in maternal and fetal compartments. Acute cadmium exposure in the last trimester of gestation poses a risk for fetal viability especially when combined with low iron in maternal diet.

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Authors and Affiliations

  1. Mineral Metabolism Unit, Institute for Medical Research and Occupational Health, P.O. Box 291, HR-10001, Zagreb, Republic of Croatia

    Martina Piasek, Maja Blanuša & Krista Kostial

  2. National Health and Environmental Effects Research Laboratory, US Environmental Protection Agency, Research Triangle Park, North Carolina, 27711, USA

    John W. Laskey

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  1. Martina Piasek
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  2. Maja Blanuša
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  4. John W. Laskey
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Correspondence to Martina Piasek.

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Piasek, M., Blanuša, M., Kostial, K. et al. Low iron diet and parenteral cadmium exposure in pregnant rats: the effects on trace elements and fetal viability. Biometals 17, 1–14 (2004). https://doi.org/10.1023/A:1024426931676

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