New quinolone (NQ) antimicrobials may influence the functions of polymorphonuclear leukocyes (PMNs). Fleroxacin (FLRX), one of the newer NQs which has a long half-life in blood and a strong bactericidal effect, was examined for its influence on superoxide production by PMNs. Augmentation of superoxide production by PMNs when stimulated with phorbol myristate acetate (PMA) and formyl-methionyl-leucyl-phenylalanine (fMLP) was observed following the addition of 25, 50, 100 and 200 μg/ml of FLRX. In addition, the effects of staurosporine and H-7, inhibitors of protein kinase C (PKC), and of genistein, a tyrosine kinase (TK) inhibitor, on FLRX-enhanced superoxide production were examined. Superoxide production augmented by FLRX was diminished by the addition of staurosporine and H-7, when PMNs were stimulated with PMA, and by the addition of genistein, when PMNs were stimulated with fMLP. These results suggest that FLRX augments superoxide production by PMNs through enhancing the activities of phosphorylation by PKC or TK within the signal transduction pathway in PMNs.

This content is only available via PDF.
Copyright / Drug Dosage / Disclaimer
Copyright: All rights reserved. No part of this publication may be translated into other languages, reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying, recording, microcopying, or by any information storage and retrieval system, without permission in writing from the publisher.
Drug Dosage: The authors and the publisher have exerted every effort to ensure that drug selection and dosage set forth in this text are in accord with current recommendations and practice at the time of publication. However, in view of ongoing research, changes in government regulations, and the constant flow of information relating to drug therapy and drug reactions, the reader is urged to check the package insert for each drug for any changes in indications and dosage and for added warnings and precautions. This is particularly important when the recommended agent is a new and/or infrequently employed drug.
Disclaimer: The statements, opinions and data contained in this publication are solely those of the individual authors and contributors and not of the publishers and the editor(s). The appearance of advertisements or/and product references in the publication is not a warranty, endorsement, or approval of the products or services advertised or of their effectiveness, quality or safety. The publisher and the editor(s) disclaim responsibility for any injury to persons or property resulting from any ideas, methods, instructions or products referred to in the content or advertisements.
You do not currently have access to this content.