Effects of grepafloxacin on the function of human polymorphonuclear leukocytes and the phosphorylation of p38 mitogen-activated protein kinase.

Abstract:

BACKGROUND:Some new quinolones (NQs) modulate polymorphonuclear leukocyte (PMN) functions. We investigated these effects on PMN functions at concentrations <10 microg/ml. METHODS:Chemotactic activity and the production of reactive oxygen species (ROS) were measured using a 48-well chemotaxis chamber and by luminol-dependent chemiluminescence (CL) activity, respectively. The phosphorylation of p38 mitogen-activated protein kinase (MAPK) was measured by Western blot using specific antibodies to its phosphorylation sites. RESULTS:Grepafloxacin (GPFX) at concentrations >5 microg/ml increased the chemotactic activity and ROS production of PMNs after stimulation with N-formylmethionyl-leucyl-phenylalanine (fMLP), whereas prulifloxacin (PUFX) showed no effect. In contrast to PUFX, GPFX at concentrations >1 microg/ml stimulated the phosphorylation of p38 MAPK. CONCLUSIONS:GPFX enhanced the chemotactic activity and ROS production of PMNs after stimulation with fMLP at concentrations <10 microg/ml. These effects of GPFX on PMNs could be in part due to the enhancement of p38 MAPK phosphorylation.

journal_name

Chemotherapy

journal_title

Chemotherapy

authors

Koshio O,Ono Y

doi

10.1159/000232451

subject

Has Abstract

pub_date

2009-01-01 00:00:00

pages

363-71

issue

5

eissn

0009-3157

issn

1421-9794

pii

000232451

journal_volume

55

pub_type

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