Effects of manganese forms on biogenic amines in the brain and behavioral alterations in the mouse: Long-term oral administration of several manganese compounds

Journal Article · Sat Feb 01 00:00:00 EST 1992 · Environmental Research; (United States)

DOI:https://doi.org/10.1016/S0013-9351(05)80017-9· OSTI ID:7206344

Komura, Junko; Sakamoto, Michiko ^[1]

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1. Hokuriku Univ., Kanazawa (Japan)

This work has identified the relative toxicity of four forms of manganese, using biogenic amine levels, tissue retention, weight gain, and activity scores as criteria. Male mice were chronically treated with four forms of manganese administered orally, mixed with the diet, for 12 months. The Mn levels were higher in some parts of brain after feeding insoluble salts than after the soluble salts. The concentration of manganese was significantly increased in the liver and spleen of the manganese carbonate-exposed group, compared with the concentration in the control group. Manganese dioxide feeding lowered dopamine and increased homovanilic acid. Since manganese dioxide is a powerful oxidizing agent in organic chemistry, it possibly enhanced the oxidative metabolite of dopamine. Accumulation of manganese in the brain correlated with reduced hypothalamic dopamine levels in the manganese acetate-exposed group; and the amount of manganese accumulated correlated with the intensity of suppression of motor activity. These findings indicate that manganese dioxide is more toxic than divalent manganese. Of the divalent manganese compounds, manganese acetate seemed to have the greatest toxic effect.

• OSTI ID: 7206344
• Journal Information: Environmental Research; (United States), Vol. 57:1; ISSN 0013-9351
• Country of Publication: United States
• Language: English

Related Subjects

63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
BRAIN
SENSITIVITY
MANGANESE
TOXICITY
BEHAVIOR
BIOLOGICAL ACCUMULATION
DOPAMINE
MICE
ORAL ADMINISTRATION
AMINES
ANIMALS
AROMATICS
AUTONOMIC NERVOUS SYSTEM AGENTS
BODY
CARDIOTONICS
CARDIOVASCULAR AGENTS
CENTRAL NERVOUS SYSTEM
DRUGS
ELEMENTS
HYDROXY COMPOUNDS
MAMMALS
METALS
NERVOUS SYSTEM
NEUROREGULATORS
ORGANIC COMPOUNDS
ORGANS
PHENOLS
POLYPHENOLS
RODENTS
SYMPATHOMIMETICS
TRANSITION ELEMENTS
VERTEBRATES
560300* - Chemicals Metabolism & Toxicology