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PubMed2005

Toxicity induced by Hg2+ on choline acetyltransferase activity from E. electricus (L.) electrocytes: the protective effect of 2,3 dimercapto-propanol (BAL).

BACKGROUND: The effect of mercury (Hg(2+)) on the activity of choline acetyltransferase (ChAT) from electrocytes of Electrophorus electricus (L.) was studied due to the importance of this enzyme and acetylcholine in many neurochemical functions such as arousal, learning, and memory. MATERIAL/METHODS: Mercury, which has affinity to thiol groups, acted as a potent inhibitor of ChAT, which was obtained by differential centrifugation and ammonium sulfate precipitation, at 80%, from the main electric organ homogenate. RESULTS: Mercury inhibition presents different kinetic behaviors for both enzyme substrates: noncompetitive to choline and of mixed type to AcCoA, with inhibition constants on the order of 0.5 to 1.0 microM. The enzyme activity was recovered using 2,3 dimercapto-propanol (BAL), a well-known chelate for sulphydryl groups and metals, which acted as a protecting agent and was able to revert the Hg(2+) inhibition at a concentration of 10 (-6) M. After treatment with this metal and in the presence of 2,3 dimercapto-propanol, 70% of the enzyme activity was recovered for AcCoA and 80% for choline. CONCLUSIONS: The observed inhibition is likely due to direct protein interaction, because the addition of BAL reversed the effects of HgCl(2) on ChAT activity. The results cast new light on the mechanisms of mercurial neurotoxicity.

Animals↗
PubMed1991

[The effect of aurotherapy on the content of corticotropin, cortisol, aldosterone and insulin in the blood serum of rheumatoid arthritis patients].

The author studied the content of corticotropin, cortisol, aldosterone, insulin in the blood serum of 69 patients with rheumatoid arthritis depending on the grade of activity of the inflammatory process before treatment in the course of aurotherapy within 12 months. It was established that in patients with rheumatoid arthritis changes develop in the system of pituitary-peripheral endocrine glands, namely, an increase of the concentration of corticotropin, aldosterone and a reduction of the level of cortisol and insulin indicating the participation of hormones in the pathogenesis of rheumatoid arthritis. Non-steroid antiinflammatory preparations and quinolinic derivatives did not effect the hormonal spectrum of rheumatoid arthritis. Prolonged aurotherapy resulted in a positive dynamics in the contents of hormones.

Adrenocorticotropic Hormone↗