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Influence of therapeutic and toxic doses of neuroleptics and antidepressants on energy metabolism of the isolated perfused rat brain

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Summary

The isolated perfused rat brain was used for a comparative study of the effects of promazine, imipramine, monodesmethyl promazine and desipramine on cerebral energy metabolism. After perfusion for 30 min or 1 h the brain levels of the following substrates and metabolites were estimated: P-creatine, creatine, ATP, ADP, AMP, glycogen, glucose, glucose-6-P, fructose diphosphate, dihydroxyacetone-P, pyruvate, lactate, α-ketoglutarate, and ammonia. Drug concentrations of 5·10−6 M and 10−5 M in the perfusion medium caused a significant decrease of glucose-6-P alone. When the drug concentration was raised to a toxic range (10−4 M), reflected in the EEG by the pattern of secondary discharges, an accumulation of P-creatine and glucose and a decrease of glycogen, glucose-6-P and ammonia occurred; the lactate/pyruvate ratios remained unchanged. As there were no qualitative differences between the effects of the investigated neuroleptics and antidepressants on cerebral metabolism, these effects might be unspecific and not correlated with the pharmacological action of the drugs.

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Authors and Affiliations

  1. Pharmakologisches Institut der Universität Mainz, Mainz, Germany

    J. Krieglstein & R. Stock

  2. Neuro-Psychiatrische Klinik der Universität Mainz, Mainz, Germany

    H. Rieger

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  1. J. Krieglstein
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  2. R. Stock
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  3. H. Rieger
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Krieglstein, J., Stock, R. & Rieger, H. Influence of therapeutic and toxic doses of neuroleptics and antidepressants on energy metabolism of the isolated perfused rat brain. Naunyn-Schmiedeberg's Arch. Pharmacol. 279, 243–254 (1973). https://doi.org/10.1007/BF00500604

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