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Related Experiment Videos

Modulatory effect of roxithromycin on human neutrophil function

T Mitsuyama1, T Furuno, K Hidaka

  • 1Research Institute for Diseases of the Chest, Faculty of Medicine, Kyushu University, Fukuoka, Japan.

Research in Experimental Medicine. Zeitschrift Fur Die Gesamte Experimentelle Medizin Einschliesslich Experimenteller Chirurgie
|January 1, 1996
PubMed
Summary

Roxithromycin, an antibiotic, reduces neutrophil overactivity and protects against tissue injury. This macrolide antibiotic may help treat diseases exacerbated by excessive neutrophil action.

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Area of Science:

  • Immunology
  • Pharmacology

Background:

  • Neutrophils are key mediators of tissue injury.
  • Understanding neutrophil function modulation is crucial for treating inflammatory diseases.

Purpose of the Study:

  • To investigate the effects of roxithromycin on human neutrophil functions.
  • To explore the potential of roxithromycin in mitigating neutrophil-induced tissue damage.

Main Methods:

  • Human neutrophils were isolated and stimulated with N-formyl-methionyl-leucyl-phenylalanine (fMLP).
  • Superoxide (O2-) production and intracellular calcium (Ca2+) influx were measured.
  • The role of cyclic AMP-dependent protein kinase (PKA) was assessed using an inhibitor (H-89).
  • Endothelial cell injury models were used to evaluate roxithromycin's protective effects.

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Main Results:

  • Roxithromycin significantly inhibited fMLP-induced O2- production in neutrophils.
  • The drug suppressed fMLP-induced Ca2+ influx in human neutrophils.
  • Inhibition of PKA reversed the effects of roxithromycin, suggesting PKA involvement.
  • Roxithromycin ameliorated neutrophil-induced endothelial cell injury.

Conclusions:

  • Roxithromycin modulates human neutrophil functions, including O2- production and Ca2+ signaling, potentially via PKA.
  • Roxithromycin demonstrates protective effects against neutrophil-mediated endothelial cell injury.
  • Roxithromycin shows therapeutic potential for conditions involving excessive neutrophil activity.