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Mediators of Inflammation
Volume 2010 (2010), Article ID 613937, 7 pages
http://dx.doi.org/10.1155/2010/613937
Clinical Study

Both IL-1β and TNF-α Regulate NGAL Expression in Polymorphonuclear Granulocytes of Chronic Hemodialysis Patients

1Unit of Clinical Microbiology, Department of Surgical Science, Faculty of Medicine, University of Messina, 98125 Messina, Italy
2Pharmaco-Biological Department, University of Messina, 98125 Messina, Italy
3Department of Internal Medicine, University of Messina, 98125 Messina, Italy

Received 30 October 2010; Accepted 15 December 2010

Academic Editor: Fulvio D'Acquisto

Copyright © 2010 Adriana Arena et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Background. NGAL is involved in modulation of the inflammatory response and is found in the sera of uremic patients. We investigated whether hemodiafiltration (HDF) could influence the ability of polymorphonuclear granulocytes (PMGs) to release NGAL. The involvement of interleukin- (IL-)1β and tumor necrosis factor- (TNF-)α on NGAL release was evaluated. Methods. We studied end-stage renal disease (ESRD) patients at the start of dialysis (Pre-HDF) and at the end of treatment (Post-HDF) and 18 healthy subjects (HSs). Peripheral venous blood was taken from HDF patients at the start of dialysis and at the end of treatment. Results. PMGs obtained from ESRD patients were hyporesponsive to LPS treatment, with respect to PMG from HS. IL-1β and TNF-α produced by PMG from post-HDF patients were higher than those obtained by PMG from pre-HDF. Neutralization of IL-1β, but not of TNF-α, determined a clear-cut production of NGAL in PMG from healthy donors. On the contrary, specific induction of NGAL in PMG from uremic patients was dependent on the presence in supernatants of IL-1β and TNF-α. Conclusion. Our data demonstrate that in PMG from healthy subjects, NGAL production was supported solely by IL-1β, whereas in PMG from HDF patients, NGAL production was supported by IL-1β, TNF-α.