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Blood, 1 October 2006, Vol. 108, No. 7, pp. 2455-2462.
Prepublished online as a Blood First Edition Paper on June 13, 2006; DOI 10.1182/blood-2006-04-017251.
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TRANSFUSION MEDICINE
Soluble CD40 ligand accumulates in stored blood components, primes neutrophils through CD40, and is a potential cofactor in the development of transfusion-related acute lung injury
Samina Yasmin Khan,
Marguerite R. Kelher,
Joanna M. Heal,
Neil Blumberg,
Lynn K. Boshkov,
Richard Phipps,
Kelly F. Gettings,
Nathan J. McLaughlin, and
Christopher C. Silliman
From the Departments of Surgery and Pediatrics, University of Colorado School of Medicine, Denver, CO; the Departments of Transfusion Medicine, Hematology-Oncology, Environmental Medicine, Immunology, and Lung Biology, University of Rochester, Rochester, NY; the Department of Pathology, Oregon Health Sciences University, Portland, OR; and Bonfils Blood Center, Denver, CO.
Transfusion-related acute lung injury (TRALI) is a form of posttransfusion acute pulmonary insufficiency that has been linked to the infusion of biologic response modifiers (BRMs), including antileukocyte antibodies and lipids. Soluble CD40 ligand (sCD40L) is a platelet-derived proinflammatory mediator that accumulates during platelet storage. We hypothesized that human polymorpho-nuclear leukocytes (PMNs) express CD40, CD40 ligation rapidly primes PMNs, and sCD40L induces PMN-mediated cytotoxicity of human pulmonary microvascular endothelial cells (HMVECs). Levels of sCD40L were measured in blood components and in platelet concentrates (PCs) implicated in TRALI or control PCs that did not elicit a transfusion reaction. All blood components contained higher levels of sCD40L than fresh plasma, with apheresis PCs evidencing the highest concentration of sCD40L followed by PCs from whole blood, whole blood, and packed red blood cells (PRBCs). PCs implicated in TRALI reactions contained significantly higher sCD40L levels than control PCs. PMNs express functional CD40 on the plasma membrane, and recombinant sCD40L (10 ng/mL-1 µg/mL) rapidly (5 minutes) primed the PMN oxidase. Soluble CD40L promoted PMN-mediated cytotoxicity of HMVECs as the second event in a 2-event in vitro model of TRALI. We concluded that sCD40L, which accumulates during blood component storage, has the capacity to activate adherent PMNs, causing endothelial damage and possibly TRALI in predisposed patients.
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