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Irreversible binding of 3-14C-antipyrine to hepatic protein in vivo and in metabolizing liver microsomes

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Summary

After i.p. injection of 3-14C-antipyrine (10 μmole=1.9 mg with 10 μCi per 10 g of body weight) to mice radioactivity was irreversibly bound to liver proteins. The irreversible binding reached maximal values of 0.15 nmole/mg protein in liver microsomes after 30–60 min.

During 60 min incubation with liver microsomes of mice and rabbits (phenobarbital pretreated) and a NADPH-regenerating system 3-14C-antipyrine was irreversibly bound to microsomal protein at a rate of 1.5 nmole/mg protein (mouse) and 3 nmole/mg protein (rabbit).

In identical incubates with rabbit liver microsomes the 4-hydroxylation of antipyrine was 24 nmole/mg protein in 60 min and formaldehyde production from antipyrine 3 nmole/mg protein in 60 min.

In incubates with rabbit liver microsomes the binding rate was 80–90% inhibited by 1mM metyrapone, SKF 525-A and trichloropropene epoxide respectively; 4-hydroxylation was 70–80% inhibited by the same substances. In the presence of 1 mM GSH, cysteine or ethylene diamine binding was 30–40% inhibited, whereas 4-hydroxylation showed no inhibition.

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  1. Institut für Pharmakologie der Universität Tübingen, Wilhelmstrasse 56, D-7400, Tübingen, Germany

    Sonja Tabarelli-Poplawski & H. Uehleke

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  1. Sonja Tabarelli-Poplawski
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  2. H. Uehleke
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Tabarelli-Poplawski, S., Uehleke, H. Irreversible binding of 3-14C-antipyrine to hepatic protein in vivo and in metabolizing liver microsomes. Naunyn-Schmiedeberg's Arch. Pharmacol. 297, 105–110 (1977). https://doi.org/10.1007/BF00508817

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  • DOI: https://doi.org/10.1007/BF00508817

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