Quantification of progenitors capable of generating T cells in human cord blood.

Abstract:

OBJECTIVE:For transplantation of cord blood (CB) cells, it is important to select a CB sample that can reconstitute not only myelo-erythropoiesis but also lymphopoiesis in recipients. However, until now the reconstitution ability of CB samples has been assessed by colony forming unit-culture (CFU-C) assay or by simply counting CD34+ cells. The present study aims at establishing a method capable of assessing the potential of T lymphopoieses of CB samples. METHODS:CD34+ CD38- cells sorted from CB were cultured on a monolayer of murine stromal cell line TSt-4, transduced with the human Delta-like 1 gene. RESULTS:Immature T cells expressing CD5 and/or CD7 were generated in the culture. As these immature T cells can easily be discriminated from mature T cells that are included in the mononuclear cell population (MNCs), we can use the MNCs as starting material for quantification of progenitors capable of generating T cells (TGP). By applying a limiting dilution analysis, we succeeded in determining the frequency of TGP in MNCs. It was found that the ratios for the number of TGP vs. that of CFU-C differ among CB samples maximally by 3.5 times. CONCLUSION:The present assay system provides a novel tool for the evaluation of CB samples, especially for their T-cell-generating potential.

journal_name

Eur J Haematol

authors

Kato M,Masuda K,Kakugawa K,Kawamoto H,Mugishima H,Katsura Y

doi

10.1111/j.1600-0609.2007.00991.x

subject

Has Abstract

pub_date

2008-02-01 00:00:00

pages

151-9

issue

2

eissn

0902-4441

issn

1600-0609

pii

EJH991

journal_volume

80

pub_type

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