Abstract

Background. Leucoreduction of blood components, including platelet components, is strongly encouraged but not yet universal, especially outside high income countries. As both leucocytes and platelets secrete copious amounts of pro-inflammatory cytokines/chemokines under various conditions and during storage, we investigated the potential of the respective secretory programmes of these cells in order to evaluate their subsequent pathophysiological effects.
Material and methods. A total of 158 individual non-leucoreduced platelet components were obtained from Tunisian donors and tested for characteristic biological response modifiers (BRM) of leukocytes (IL-1β, IL-8), platelets (sCD62P, sCD40L) and both cell types (TNF-a, RANTES) in the presence or absence of thrombin stimulation and after different periods of storage (up to 5 days). BRM levels were determined using enzyme-linked immunosorbent assays and Luminex technology. Platelet-leucocyte aggregate formation during storage was analysed using flow cytometry.
Results. Leucocyte- and platelet-associated BRM had clearly distinct profiles both at the onset (day 0) and termination (day 5) of the observation period but altered during the intermediate period so that their respective importance was inverted; in fact, the profiles were merged and indistinguishable on days 2-3. The leucocyte-derived BRM largely dominated over platelet-derived ones and further altered the BRM platelet secretion programme.
Discussion. This study contributes substantial, new information on leucocyte/platelet interactions and their likely role in transfusion when leucodepletion cannot be performed or is only partially achieved.

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Authors

Chaker Aloui - GIMAP-EA3064, University of Lyon, Saint-Etienne, France; Auvergne-Loire French Blood Establishment, Saint-Etienne, France

Tahar Chakroun - Regional Blood Transfusion Centre, CHU Farhat Hached, Sousse, Tunisia

Antoine Prigent - GIMAP-EA3064, University of Lyon, Saint-Etienne, France

Saloua Jemni-Yacoub - Regional Blood Transfusion Centre, CHU Farhat Hached, Sousse, Tunisia

Fabrice Cognasse - GIMAP-EA3064, University of Lyon, Saint-Etienne, France; Auvergne-Loire French Blood Establishment, Saint-Etienne, France

Sandrine Laradi - GIMAP-EA3064, University of Lyon, Saint-Etienne, France; Auvergne-Loire French Blood Establishment, Saint-Etienne, France

Olivier Garraud - GIMAP-EA3064, University of Lyon, Saint-Etienne, France; INTS - National Institute of Blood Transfusion, Paris, France

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