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Effects of methyl methacrylate on non-protein thiols and drug metabolizing enzymes in rat liver and kidneys

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Abstract

Male Wistar rats received methyl methacrylate monomer (MMA) i.p. in olive oil 1.0 g/kg body weight on 3 successive days. The weight of the livers and kidneys, and the body weights did not differ from their controls. On the fifth day after treatment, hepatic NADPH-cytochrome c reductase, 7-ethoxycoumarin 0-deethylase and the 2,5-diphenyloxazole hydroxylase exhibited maximal decreases in activity (25%, 58%, 36%, respectively) without any coincident effect on the total amount of cytochrome P-450 hemoprotein itself. One week later these activities had returned to control levels. The enzymatic changes in the kidneys were smaller in magnitude, and they were also reversed sooner.

A single i.p. dose of MMA (2 g/kg body weight) caused elevation of serum alanine aminotransferase activity. A tenfold increase of the excretion rate of urinary thioethers was also discovered. The hepatic reduced glutathione (GSH) was depleted in 3 h to 20% and the GSSG to half of the value in controls. In kidneys, the GSH was decreased to 48% in 3 h before an apparent phase of overrecovery. At the end of the 24 h observation period, cytochrome P-450 concentrations were somewhat decreased in the liver.

The GSH contents showed dose and time-dependent reversible decreases in isolated hepatocytes when incubated for 2 h in a medium containing MMA at the nominal concentrations of 0,2,5, or 10 mM. None of the treatments affected either the content of cytochrome P-450 or the viability of the liver cells.

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Abbreviations

MMA:

methyl methacrylate

GSH:

reduced glutathione

GSSG:

oxidized glutathione

S-ALAT:

serum alanine aminotransferase

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Authors and Affiliations

  1. Department of Industrial Hygiene and Toxicology, Institute of Occupational Health, Haartmaninkatu 1, SF-00290, Helsinki 29, Finland

    Eivor Elovaara, Helena Kivistö & Harri Vainio

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  1. Eivor Elovaara
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  2. Helena Kivistö
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  3. Harri Vainio
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Elovaara, E., Kivistö, H. & Vainio, H. Effects of methyl methacrylate on non-protein thiols and drug metabolizing enzymes in rat liver and kidneys. Arch Toxicol 52, 109–121 (1983). https://doi.org/10.1007/BF00354771

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  • DOI: https://doi.org/10.1007/BF00354771

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