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Research Article |
a
ska1
ocka1ska-Janik1,*
1 Medical Research Centre, Polish Academy of Sciences, 5 Pawinskiego St. 02-106
Warsaw, Poland
2 Institute of Oncology, 5 Roentgena St. 02-781 Warsaw, Poland
* Author for correspondence (e-mail: kd-j{at}cmdik.pan.pl )
Accepted 20 February 2002
Neural stem cells are clonogenic, self-renewing cells with the potential to differentiate into brain-specific cell lines. Our study demonstrates that a neural-stem-cell-like subpopulation can be selected and expanded in vitro by the use of human umbilical cord blood cells, which are a relatively easily available starting material. Through a combination of antigen-driven magnetic cell sorting and subfractionation according to cell surface adhesive properties, we have isolated a clonogenic fraction devoid of hematopoietic or angiogenetic properties but with relatively high self-renewal potency. The resulting clones express nestin, a neurofilament protein that is one of the most specific markers of multipotent neural stem cells. In the presence of selected growth factors or in the rat brain co-culture system, the progeny of these cells can be oriented towards the three main neural phenotypes: neurons, astroglia and oligodendroglia. The cells show high commitment (about 30% and 40% of the population) to neuronal and astrocytic fate, respectively. Interestingly, upon differentiation, the neural-type precursor cells of cord blood origin also give rise to a relatively high proportion of oligodendrocytes — 11% of the total population of differentiating cells.
Key words: Human stem cells, Cord blood, Neural differentiation, Neural progenitors, Transdifferentiation
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