Ann Lab Med.  2016 Jul;36(4):362-366. 10.3343/alm.2016.36.4.362.

Effect of Irradiation on Microparticles in Red Blood Cell Concentrates

• Cho CH
• Yun SG
• Koh YE
• Lim CS

• KMID: 2373557
• DOI: http://doi.org/10.3343/alm.2016.36.4.362

Abstract

Changes in microparticles (MP) from red blood cell (RBC) concentrates in the context of irradiation have not been investigated. The aim of this study was to evaluate how irradiation affects the number of MPs within transfusion components. Twenty RBC concentrates, within 14 days after donation, were exposed to gamma rays (dose rate: 25 cGy) from a cesium-137 irradiator. Flow cytometry was used to determine the numbers of MPs derived from RBC concentrates before and 24 hr after irradiation. The mean number of MPs (±standard deviation) in RBC concentrates was 21.9×10(9)/L (±22.7×10(9)/L), and the total number of MPs ranged from 2.6×10(9)/L to 96.9×10(9)/L. The mean number of MPs increased to 22.6×10(9)/L (±31.6×10(9)/L) after irradiation. Before irradiation, the CD41-positive and CD235a-positive MPs constituted 9.5% (1.0×10(9)/L) and 2.2% (263×10(6)/L) of total MPs, respectively. After irradiation, CD41-positive MPs increased to 12.1% (1.5×10(9)/L) (P=0.014), but the CD235a-positive MPs decreased to 2.0% (214×10(6)/L) of the total MPs (P=0.369). Irradiation increases the number of CD41-positive MPs within RBC concentrates, suggesting the irradiation of RBC concentrates could be associated with thrombotic risk of circulating blood through the numerical change.

Keyword

Microparticles; Irradiation; CD235a; CD41; RBCs

MeSH Terms

Cell-Derived Microparticles/chemistry/*metabolism/radiation effects
Erythrocytes/*cytology/radiation effects
Flow Cytometry
Gamma Rays
Humans
Membrane Glycoproteins/metabolism
Metalloendopeptidases/metabolism
Platelet Membrane Glycoprotein IIb/metabolism
Membrane Glycoproteins
Metalloendopeptidases
Platelet Membrane Glycoprotein IIb

Figure

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  Fig. 1 (A-C) Gating strategy for the identification of microparticles (MPs). (A) The MP region is set up. On a forward scatter (FS) log×side scatter (SS) log cytogram, the MP region is restricted to the lower region by the 0.5 µm beads and to the upper region by the 0.9 µm beads. Three-micrometer beads were responsible for a discrete cloud of events that were easily distinguished above background noise or debris. MPs are seen in (B) as blue dots against the background (gray dots). CD235a-positive MPs are shown in (C) as violet dots within the box. (D-G) Analysis of CD41/CD235a stained MPs in pre- and post-irradiation conditions using flow cytometry. (D) CD235a-positive MPs within RBC concentrates (violet dots) before irradiation; (E) CD235a-positive MPs within RBC concentrates (violet dots) after irradiation; (F) CD41-positive MPs within RBC concentrates before irradiation (green dots); (G) CD41-positive MPs within RBC concentrates after irradiation (green dots).Abbreviations: PE, phycoerythrin; FITC, fluorescein isothiocyanate; RBC, red blood cell.

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