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Airborne manganese exposure differentially affects end points of oxidative stress in an age-and sex-dependent manner

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Abstract

Juvenile female and male (young) and 16-mo-old male (old) rats inhaled manganese in the form of manganese sulfate (MnSO4) at 0, 0.01, 0.1, and 0.5 mg Mn/m3 or manganese phosphate at 0.1 mg Mn/m3 in exposures of 6h/d, 5d/wk for 13 wk. 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. Although most brain regions in the three groups of animals were unaffected by manganese exposure in terms of GS protein levels, there was significantly increased protein (p<0.05) in the hippocampus and decreased protein in the hypothalamus of young male rats exposed to manganese phosphate as well as in the aged rats exposed to 0.1 mg/m3 MnSO4. Conversely, GS protein was elevated in the olfactory bulb of females exposed to the high dose of MnSO4. Statistically significant decreases (p<0.05) in MT and GS mRNA as a result, of manganese exposure were observed in the cerebellum, olfactory bulb, and hippocampus in the young male rats, in the hypothalamus in the young female rats, and in the hippocampus in the senescent males. Total GSH levels significantly (p<0.05) decreased in the olfactory bulb of manganese exposed young male rats and increased in the olfactory bulb of female rats exposed to manganese. Both the aged and young female rats had significantly decreased (p<0.05) GSH in the striatum resulting from manganese inhalation. The old male rats also had depleted GSH levels in the cerebellum and hypothalamus as a result, of the 0.1-mg/m3 manganese phosphate exposure. These results demonstrate that age and sex are variables that must be considered whenassessing the neurotoxicity of manganese.

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Authors and Affiliations

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

    Keith M. Erikson, Allison W. Dobson & Michael Aschner

  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

Authors
  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. Allison W. Dobson
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  5. Michael Aschner
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Erikson, K.M., Dorman, D.C., Lash, L.H. et al. Airborne manganese exposure differentially affects end points of oxidative stress in an age-and sex-dependent manner. Biol Trace Elem Res 100, 49–62 (2004). https://doi.org/10.1385/BTER:100:1:049

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