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Advances in Hematology
Volume 2012 (2012), Article ID 924042, 8 pages
http://dx.doi.org/10.1155/2012/924042
Research Article

Synergistic Effect of Anemia and Red Blood Cells Transfusion on Inflammation and Lung Injury

1Division of Cardiovascular Medicine, The Gill Heart Institute, 741 S. Limestone Street, 252 BBSRB, Lexington, KY 40536-0509, USA
2Medical Service, Lexington VA Medical Center, 1101 Veterans Drive, Lexington, KY 40502, USA

Received 5 March 2012; Accepted 26 June 2012

Academic Editor: Shimon Slavin

Copyright © 2012 Anping Dong 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

Anemia and resultant red blood cell transfusion may be associated with adverse long-term clinical outcomes. To investigate the mechanism(s) responsible, we profiled inflammatory biomarkers and circulating levels of the bioactive lysophospholipid mediator sphingosine-1-phosphate (S1P) in control and anemic mice with or without LPS-induced systemic inflammation. Acute anemia or lipopolysaccharide (LPS) challenge alone triggered an increase of circulating levels of the inflammatory markers IL-6 and keratinocyte-derived chemokine (CXCL1/KC). Moreover, administration of LPS to anemic mice reduced circulating S1P levels and augmented lung injury and pulmonary vascular permeability. Transfusion of aged, but not fresh, red blood cells (RBCs) worsened pulmonary vascular leak. S1P levels decline markedly during storage of mouse RBCs. Loading stored murine RBCs with S1P prior to transfusion partially attenuated anemia-associated acute pulmonary vascular leak. Taken together, our results indicate that anemia and systemic inflammation can alter the S1P buffering capacity of RBCs, suggesting possible strategies for alleviating transfusion-related lung injury in clinical practice.