Abstract
Minor populations of glycosylphosphatidylinositol-anchored protein-deficient (GPI[−]) cells in the peripheral blood may have a prognostic value in bone marrow failure (BMF). Our objective is to establish the optimal flow cytometry (FCM) assay that can discriminate GPI(−) populations specific to BMF from those of healthy individuals. To identify a cut-off that discriminates GPI(−) rare cells from GPI(+) cells, we determined a position of the borderline that separates the GPI(−) from GPI(+) cells on a scattergram by testing more than 30 healthy individuals, such that no GPI(−) dot fell into the upper left quadrant where fluorescein-labeled aerolysin (FLAER)−CD11b+ granulocytes and CD55−CD59− glycophorin A+ erythrocytes were positioned. This method allowed us to define ≥ 0.003% CD11b+FLAER− granulocytes and ≥ 0.005% glycophorin A+CD55−CD59− erythrocytes to be specific to BMF patients. Longitudinal cross-validation studies showed minimal (< 0.02%) inter-laboratory differences in the GPI(−) cell percentage. An analysis of 1210 patients with BMF revealed a GPI(−) cell population in 56.3% of patients with aplastic anemia and 18.5% of patients with myelodysplastic syndrome. The GPI(−) granulocyte percentages was 0.003–0.01% in 3.7% of patients. This FCM assay effectively identified an increase in the percentage of GPI(−) rare cells that are specific to BMF patients and allowed different laboratories to accurately detect 0.003–0.01% of pathological GPI(−) cells.
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We thank all participating physicians and registered patients who took part in this study.
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Research fund from Alexion.
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KH, CS, HN, TS, NO, YS, YN, YU, YY, and TK performed the research; TS, SC, HN, KA, YY, and TK collected patients’ samples. KI and HT collected samples from healthy volunteer. CS, JN, YK and SN designed the study; KH, CS, and SN wrote the paper.
Language check, by an independent medical writer, Caroline Dunstall, was provided by Alexion.
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All human subjects were collected after obtaining written informed consent for their participation in accordance with the Declaration of Helsinki through clinical protocols approved by the Institutional Review Board.
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Dr. Ninomiya, Dr. Shichishima, Dr. Yonemura, Dr. Kawaguchi, and Dr. Nakao report personal fees from Alexion Pharma G.K., outside the submitted work; Dr. Ninomiya, Dr. Chiba, Dr. Ueda, Dr. Yonemura, and Dr. Nakao report grants from Alexion Pharma G.K., outside the submitted work; Dr. Kanakura and Dr. Nishimura report grant and personal fees from Alexion Pharma G.K. during the conduct of the study; Dr. Shirasugi report honoraria from Novartis; Dr. Hosokawa, Dr. Sugimori, Dr. Ishiyama, Dr. Takamatsu, Dr. Noji, Dr. Obara, Dr. Nakamura, and Dr. Ando have nothing to declare.
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Hosokawa, K., Sugimori, C., Ishiyama, K. et al. Establishment of a flow cytometry assay for detecting paroxysmal nocturnal hemoglobinuria-type cells specific to patients with bone marrow failure. Ann Hematol 97, 2289–2297 (2018). https://doi.org/10.1007/s00277-018-3443-1
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DOI: https://doi.org/10.1007/s00277-018-3443-1