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Persistent alterations in biomarkers of oxidative stress resulting from combined in Utero and neonatal manganese inhalation

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Abstract

Neonatal female and male rats were exposed to airborne manganese sulfate (MnSO4) during gestation and postnatal d 1–18. Three weeks post-exposure, rats were killed and we assessed biochemical end points indicative of oxidative stress in five brain regions: cerebellum, hippocampus, hypothalamus, olfactory bulb, and striatum. Glutamine synthetase (GS) protein levels, metallothionein (MT) and GS mRNA levels, and total glutathione (GSH) levels were determined for all five regions. Overall, there was a statistically significant effect of manganese exposure on decreasing brain GS protein levels (p=0.0061), although only the highest dose of manganese (1 mg Mn/m3) caused a significant increase in GS messenger RNA (mRNA) in both the hypothalamus and olfactory bulb of male rats and a significant decrease in GS mRNA in the striatum of female rats. This highest dose of manganese had no effect on MT mRNA in either males or females; however, the lowest dose (0.05 mg Mn/m3) decreased MT mRNA in the hippocampus, hypothalamus, and striatum in males. The median dose (0.5 mg Mn/m3) led to decreased MT mRNA in the hippocampus and hypothalamus of the males and olfactory bulb of the females. Overall, manganese exposure did not affect total GSH levels, a finding that is contrary to those in our previous studies. Only the cerebellum of manganese-exposed young male rats showed a significant reduction (p<0.05) in total GSH levels compared to control levels. These data reveal that alterations in biomarkers of oxidative stress resulting from in utero and neonatal exposures of airborne managanese remain despite 3 wk of recovery; however, it is important to note that the doses of manganese utilized represent levels that are 100-fold to a 1000-fold higher than the inhalation reference concentration set by the US Environmental Protection Agency.

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Authors and Affiliations

  1. Department of Nutrition, University of North Carolina Greensboro, 27402-6170, Greensboro, NC

    Keith M. Erikson

  2. CIIT Centers for Health Research, Research Triangle Park, NC

    David C. Dorman

  3. Department of Pharmacology, Wayne State University, Detroit, MI

    Lawrence H. Lash

  4. Department of Physiology and Pharmacology, and Interdisciplinary Program in Neuroscience, Wake Forest University School of Medicine, Winston-Salem, NC

    Michael Aschner

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  1. Keith M. Erikson
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  2. David C. Dorman
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  3. Lawrence H. Lash
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  4. Michael Aschner
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Erikson, K.M., Dorman, D.C., Lash, L.H. et al. Persistent alterations in biomarkers of oxidative stress resulting from combined in Utero and neonatal manganese inhalation. Biol Trace Elem Res 104, 151–163 (2005). https://doi.org/10.1385/BTER:104:2:151

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  • DOI: https://doi.org/10.1385/BTER:104:2:151

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