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Superoxide inhibition following different stimuli of respiratory burst and metabolism of aminosalicylates in neutrophils

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Abstract

Reactive oxygen species such as superoxide radicals have been proposed to play an important role in the pathogenesis of inflammatory bowel disease. Some of the antiinflammatory actions of aminosalicylates have been ascribed to their capability to scavenge superoxide radicals directly or to inhibit its production in stimulated neutrophils. However, as a controversy still exists with regard to the precise mechanisms of inhibition and the metabolism within inflammatory cells, we compared scavenger properties of 5-aminosalicylic acid, 4-aminosalicylic acid,N-acetyl aminosalicylic acid, olsalazine, and benzalazine in systems with defined superoxide radical generation such as the dimethyl sulfoxide-NaOH and the potassium superoxide system. We also studied possible inhibition of the superoxide production following different stimuli of the respiratory burst in neutrophils and investigated the uptake and potential metabolism (N-acetylation) of 5-aminosalicylic acid in lipopolysaccharide-primed and resting neutrophils. We found that 5-aminosalicylic acid and 4-aminosalicylic acid had defined scavenger properties in the dimethyl sulfoxide-NaOH or potassium superoxide systems, respectively, whereas compounds with a modified aminophenolic structure had no effects. At the cellular level, 5-aminosalicylic acid inhibited phorbol myristate acetate (100 ng/ml)-activated superoxide generation to 82.3±9.3%, the formylmethionyl leucyl peptide (10−5 M) to 61.0±6.8%, and the NaF (20 mM) -stimulated production to 32.3±3.2% (X±sd,P<0.01). The actions of the other drugs were less pronounced. Almost identical retention times (R t=11.2 min) of3H-labeled phorbol myristate acetate in the presence and absence of 5-aminosalicylic acid revealed noin vitro interactions. 5-Aminosalicylic acid permeates cells in a dose- and time-dependent manner; there was, however, no acetylation of 5-aminosalicylic acid regardless whether the cells had been stimulated or not with lipopolysaccharide. From our results we suggest that (1) the extra- (scavenger) and intracellular inhibition of superoxide radicals by 5-aminosalicylic acid may be an important mechanism of action, (2) an intact aminophenolic structure may be necessary for such actions, and (3) the inability of inflammatory neutrophils to acetylate and, therefore, inactivate 5-aminosalicylic acid could be an important determinant for its local actions.

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Authors and Affiliations

  1. Chair of Biochemistry, University of Karlsruhe, Germany

    Hubert Allgayer MD, Stephan Rang MS, Ulrich Klotz PhD, Peter Böhne PhD, Janos Retey PhD, Wolfgang Kruis MD & Roland Gugler MD

  2. Margarete-Fischer-Bosch Institute of Clinical Pharmacology, Stuttgart

    Hubert Allgayer MD, Stephan Rang MS, Ulrich Klotz PhD, Peter Böhne PhD, Janos Retey PhD, Wolfgang Kruis MD & Roland Gugler MD

  3. Protestant Hospital Köln-Kalk, Germany

    Hubert Allgayer MD, Stephan Rang MS, Ulrich Klotz PhD, Peter Böhne PhD, Janos Retey PhD, Wolfgang Kruis MD & Roland Gugler MD

  4. Medical Clinic I, Klinikum Karlsruhe, Moltkestr. 14, W-7500, Karlsruhe, Germany

    Hubert Allgayer MD, Stephan Rang MS, Ulrich Klotz PhD, Peter Böhne PhD, Janos Retey PhD, Wolfgang Kruis MD & Roland Gugler MD

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  1. Hubert Allgayer MD
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  2. Stephan Rang MS
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  3. Ulrich Klotz PhD
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  6. Wolfgang Kruis MD
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  7. Roland Gugler MD
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Dedicated to Prof. G. Paumgartner in honor of his 60th birthday.

This work was supported by a grant from Kabi-Pharmacia GmbH, Erlangen, Germany.

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Allgayer, H., Rang, S., Klotz, U. et al. Superoxide inhibition following different stimuli of respiratory burst and metabolism of aminosalicylates in neutrophils. Digest Dis Sci 39, 145–151 (1994). https://doi.org/10.1007/BF02090074

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  • DOI: https://doi.org/10.1007/BF02090074

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