Efficiency of transgenic T cell generation from gene-marked cultured human CD34+ cord blood cells is determined by their maturity and the cytokines present in the culture medium.

Abstract:

:Success of gene therapy for diseases affecting the T cell lineage depends on the thymic repopulation by genetically engineered hematopoietic progenitor cells (HPC). Although it has been shown that retrovirally transduced HPC can repopulate the thymus, little information is available on the effect of the culture protocol. Moreover, for expansion of the number of HPC, cytokine supplemented culture is needed. Here, we transduced purified human umbilical cord blood (CB) CD34+ cells in cultures supplemented with various combinations of the cytokines thrombopoietin (TPO), stem cell factor (SCF), flt3/flk-2 ligand (FL), interleukin-3 (IL-3) and IL-6, and investigated thymus-repopulating ability of gene-marked HPC in vitro. Irrespective of the cytokine cocktail used, transduced CD34+CD38- CB cells, expressing the marker green fluorescent protein (GFP) encoded by the MFG-GFP retrovirus, have both superior proliferative and thymus-repopulating potential compared with transduced CD34+CD38+ CB cells. Effectively transduced GFP+CD34+CD38- HPC, cultured for 3 or 17 days, more readily generated T cells than GFP- HPC from the same culture. The reverse was true in the case of CD34+CD38+ HPC cultures. Finally, our results indicate that the number of GFP+ T cell progenitors actually increased during culture of CD34+CD38- HPC, in a magnitude that is determined by the cytokine cocktail used during culture.

journal_name

Gene Ther

journal_title

Gene therapy

authors

Verhasselt B,Naessens E,De Smedt M,Plum J

doi

10.1038/sj.gt.3301176

keywords:

subject

Has Abstract

pub_date

2000-05-01 00:00:00

pages

830-6

issue

10

eissn

0969-7128

issn

1476-5462

journal_volume

7

pub_type

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