We evaluated superoxide (O2̇-) scavenging activity of erythromycin (EM) and of EM-iron complex by means of electron spin resonance spectroscopy, luminol-dependent chemiluminescence assay, and cytochrome c reduction assay. The EM-iron complex was produced by mixing EM with equal molar iron chloride and was stable in neutral buffer. The EM-iron complex reduced the amount of O2̇- produced by xanthine oxidase/hypoxanthine without inhibiting the enzyme activity. It also reduced the amount of O2̇- release from phorbor ester-stimulated human neutrophils and alveolar macrophages. EM alone showed few such effects. The scavenging activity of the complex was equal to that of L-ascorbic acid. These results in vitro suggest a possibility that the O2̇--scavenging effect of EM-iron complex contributes to the anti-inflammatory action of EM used in treating chronic inflammatory lung disease independent of its antimicrobial activity.
|Number of pages||5|
|Journal||Biochemical and biophysical research communications|
|Publication status||Published - 1997 Mar 6|
ASJC Scopus subject areas
- Molecular Biology
- Cell Biology