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J Chemother. 2002 Apr;14(2):132-9.
Structure-activity relationships among 9-N-alkyl derivatives of erythromycylamine and their effect on the oxidative burst of human neutrophils in vitro.
Abdelghaffar H, Kirst H, Soukri A, Babin-Chevaye C, Labro MT.
Faculte des Science I, Ain Chock, Casablanca, Morrocco.
Macrolide antibiotics have recently triggered much interest owing to the immunomodulatory potential of some derivatives, particularly in the field of inflammatory diseases. Among the possible mechanisms underlying these anti-inflammatory effects, macrolide-induced inhibition of oxidant production by phagocytes has attracted much attention. We and others have previously reported that erythromycin A-derived macrolides impair the phagocyte oxidative burst, a property linked to the presence of L-cladinose. However, we have also demonstrated that other substituents can be involved in the modulation of phagocyte function. Here we have extended the analysis of structure-activity relationships by studying the effects of five 9-N-alkyl derivatives of erythromycylamine on oxidant production by human neutrophils in vitro. LY211397 (2-methoxyethyl derivative) neither altered cell viability nor superoxide anion production. LY281389 (n-propyl derivative) did not alter cell viability and was slightly more inhibitory than erythromycylamine for the production of superoxide anion; its IC50 (concentration that inhibits 50% of the neutrophil response) was about 18 and 24 microM (versus 72 and 74 pM for erythromycylamine) after 60 min of incubation following fMLP and PMA stimulation, respectively. LY80576 (N-phenyl-3-indolylmethyl derivative), LY281981 (3-phenyl-n-propyl derivative) and LY57843 (benzyl derivative) all displayed cellular toxicity at high pharmacological concentrations after 30 to 60 min of incubation. Interestingly, these latter three drugs exhibited a rapid (5 min incubation) and strong inhibitory effect on the neutrophil oxidative burst from either stimulus, with IC50 values of 3 to 10 pM. Further in-vitro and in-vivo investigations are required to analyze the anti-inflammatory potential of these three derivatives.
online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12017367&dopt=Abstract
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