Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
2171319 | Cytotherapy | 2012 | 5 Pages |
Abstract
The prevailing school of thought is that mesenchymal stromal cells (MSC) do not express CD34, and this sets MSC apart from hematopoietic stem cells (HSC), which do express CD34. However, the evidence for MSC being CD34â is largely based on cultured MSC, not tissue-resident MSC, and the existence of CD34â HSC is in fact well documented. Furthermore, the Stro-1 antibody, which has been used extensively for the identification/isolation of MSC, was generated by using CD34+ bone marrow cells as immunogen. Thus, neither MSC being CD34â nor HSC being CD34+ is entirely correct. In particular, two studies that analyzed CD34 expression in uncultured human bone marrow nucleated cells found that MSC (BMSC) existed in the CD34+ fraction. Several studies have also found that freshly isolated adipose-derived MSC (ADSC) express CD34. In addition, all of these ADSC studies and several other MSC studies have observed a disappearance of CD34 expression when the cells are propagated in culture. Thus the available evidence points to CD34 being expressed in tissue-resident MSC, and its negative finding being a consequence of cell culturing.
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Authors
Ching-Shwun Lin, Hongxiu Ning, Guiting Lin, Tom F. Lue,