Judy L Aschner

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Manganese (Mn) is an essential mineral. It is present in virtually all diets at low concentrations. The principal route of intake for Mn is via food consumption, but in occupational cohorts, inhalation exposure may also occur (this subject will not be dealt with in this review). Humans maintain stable tissue levels of Mn. This is achieved via tight(More)
The observations by Couper in 1837 are acknowledged as the earliest description of the toxic syndrome associated with chronic manganese (Mn) exposure. Since that time, many of the neurotoxic aspects of manganism have been described, yet, the primary basis for its neurotoxicity remains unknown. Recent evidence corroborates the original hypothesis by Maynard(More)
Manganese (Mn) is an essential trace metal found in all tissues, and it is required for normal amino acid, lipid, protein, and carbohydrate metabolism. While Mn deficiency is extremely rare in humans, toxicity due to overexposure of Mn is more prevalent. The brain appears to be especially vulnerable. Mn neurotoxicity is most commonly associated with(More)
The neurotoxicity of high levels of methylmercury (MeHg) is well established both in humans and experimental animals. Astrocytes accumulate MeHg and play a prominent role in mediating MeHg toxicity in the central nervous system (CNS). Although the precise mechanisms of MeHg neurotoxicity are ill-defined, oxidative stress and altered mitochondrial and cell(More)
Spontaneous, focal gastrointestinal perforation occurred in six very low birth weight infants. The first recognized clinical sign of perforation in five of the six infants was striking blue-black discoloration of the abdominal wall. In all cases the clinical and radiographic presentations, as well as the histologic findings, were distinct from those(More)
Excessive free radical formation has been implicated as one of the causative factors in neurotoxic damage associated with variety of metals, including methylmercury (MeHg). Although the mechanism(s) associated with MeHg-dependent neurotoxicity remains far from clear, overwhelming data give credence to a mediatory role for astrocytes, a major cell type that(More)
Previous studies have shown that iron deficiency (ID) increases brain manganese (Mn), but specific regional changes have not been addressed. Weanling rats were fed one of three semipurified diets: control (CN), iron deficient (ID), or iron deficient/manganese fortified (IDMn+). Seven brain regions were analyzed for Mn concentration and amino acid(More)
BACKGROUND The efficacy and safety of early high-frequency oscillatory ventilation as compared with conventional synchronized intermittent mandatory ventilation for the treatment of infants with very low birth weight have not been established. METHODS We conducted a randomized, multicenter clinical trial to determine whether infants treated with early(More)
Oxidative stress has been implicated in neurotoxic damage associated with various metals, including methylmercury (MeHg). Although the mechanism(s) of MeHg-induced neurotoxicity remains unclear, evidence supports a mediatory role for astrocytes, a cell type that preferentially accumulates MeHg. Using scanning confocal microscopy (LSCM), the present study(More)
Mercury exists in a wide variety of physical and chemical states, each of which has unique characteristics of target organ toxicity. The classic symptoms associated with exposure to elemental mercury vapor (Hg0) and methylmercury (CH3Hg+; MeHg) involve the central nervous system (CNS), while the kidney is the target organ for the mono- and divalent salts of(More)