Linezolid diminishes inflammatory cytokine production from human peripheral blood mononuclear cells.
BACKGROUND
Active peptides produced by monocytes, in response to endotoxin, initiate and maintain the acute phase of inflammatory response. Some antibiotics have been reported to have immunomodulatory effects in addition to their antimicrobial activity. We examined the effect of linezolid on cytokine synthesis.


METHODS
The modulatory effects of erythromycin and linezolid were evaluated in LPS-stimulated human peripheral blood mononuclear cells (PBMCs). Blood was obtained by venipuncture from healthy donor volunteers. PBMCs were separated by Ficoll-Paque. More than 90% of the cells were monocytes as determined by esterase staining. Cells were incubated in the presence of LPS, with or without various concentrations of erythromycin and linezolid. The concentration of each cytokine was determined by ELISA with commercially available reagents.


RESULTS
The two drugs suppressed significantly the synthesis of the cytokines tested in a concentration-dependent manner.


CONCLUSIONS
These data indicate that antibacterial agents may modify acute phase inflammatory response through their effects on cytokines synthesis by monocytes.
Garcia-Roca
Pilar
P
Departamento de Inmunoquímica y Biología Celular, Hospital Infantil de México, Federico Gómez, México, D.F., México.
Mancilla-Ramirez
Javier
J
Santos-Segura
Araceli
A
Fernández-Avilés
Marisol
M
Calderon-Jaimes
Ernesto
E
D000081:Acetamides / Q000494:pharmacology*; D002478:Cells, Cultured; D016207:Cytokines / Q000096:biosynthesis*; D004305:Dose-Response Relationship, Drug; D004353:Drug Evaluation, Preclinical; D004917:Erythromycin / Q000494:pharmacology; D006801:Humans; D007249:Inflammation / Q000378:metabolism; D000069349:Linezolid; D008070:Lipopolysaccharides / Q000494:pharmacology; D009000:Monocytes / Q000166:cytology / Q000378:metabolism*; D023303:Oxazolidinones / Q000494:pharmacology*; D014176:Protein Biosynthesis / Q000187:drug effects*; D011500:Protein Synthesis Inhibitors / Q000494:pharmacology*
D000081:Acetamides; D016207:Cytokines; D008070:Lipopolysaccharides; D023303:Oxazolidinones; D011500:Protein Synthesis Inhibitors; D004917:Erythromycin; D000069349:Linezolid