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Megakaryothrombopoiesis during ex vivo expansion of human cord blood CD34+ cells using thrombopoietin

Title
Megakaryothrombopoiesis during ex vivo expansion of human cord blood CD34+ cells using thrombopoietin
Authors
Woo S.-Y.Kie J.-H.Ryu K.-H.Moon H.-S.Chung W.-S.Hwang D.-H.Kim S.-K.Han T.-H.Hahn M.-J.Chong Y.-H.Park H.-K.Seoh J.-Y.
Ewha Authors
박혜경서주영정영해유경하문혜성우소연
SCOPUS Author ID
박혜경scopus; 서주영scopus; 정영해scopus; 유경하scopus; 문혜성scopus; 우소연scopus
Issue Date
2002
Journal Title
Scandinavian Journal of Immunology
ISSN
0300-9475JCR Link
Citation
vol. 55, no. 1, pp. 88 - 95
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
Thrombopoietin (TPO) is one of the most promising stimulants for ex vivo expansion of haematopoietic stem cells. Previously, we have found that TPO induces a characteristic pattern of apoptosis during ex vivo expansion of human cord blood (CB) CD34+ cells and that the TPO-induced apoptotic cells belong to megakaryocyte (MK) lineage. In this study, we have examined the maturation of MK and platelet production in association with the TPO-induced apoptosis. CD34+ cells, purified from human CB, were expanded in serum-free conditions stimulated with TPO. Apoptosis was confirmed by terminal deoxynucleotidyl transferase-mediated deoxyuridine triphosphate-biotin nick end labelling (TUNEL) assay and electron microscopy (EM). Simultaneous measurement of DNA content and immunophenotyping revealed that the cells with higher DNA content (>8 N) constituted less than 5% of the CD41+ fractions until day 14, implying premature apoptosis of MKs before full polyploidization. Nevertheless, EM observation showed not only platelet territories but also newly produced platelets in which granules and microfilaments could be identified. Furthermore, flow cytometry demonstrated that the platelet fraction expressed P-selectin and an activation motif on GPIIb/IIIa recognized by monoclonal antibody PAC-1 upon stimulation with adenosine diphosphate (ADP). In addition, periodic acid-Schiff (PAS)-positive materials and nonspecific esterase activities could be demonstrated. Therefore, it is suggested that platelet production and the accompanying processes, rather than apoptosis only, be hastened during the ex vivo expansion of CB CD34+ cells when using TPO.
DOI
10.1046/j.1365-3083.2002.01031.x
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의학전문대학원 > 의학과 > Journal papers
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