There are no embryonic stem cells in the blood

Publié le : 26 July 2013

 Contrary to what scientists announced in 2006, American researchers have just refuted the existence of small embryonic stem cells in the blood and bone marrow. In 2006, scientists announced the discovery of embryonic stem cells in mice "and later studies also confirmed their presence in humans". These cells known as VSEL (Very Small Embryonic-Like stem cells), "could, according to these scientists, have the potential to become any cell in the body and thus repair tissue damaged by disease or during an accident". They could represent an alternative to embryonic stem cells.    

However, this hypothesis has just been refuted by researchers at the Stanford Faculty of Medicine in California, under the supervision of Dr Irving Weissman. This research was published in the Stem Cell Reports journal on 24 July and was carried out after noting that other laboratories did not corroborate the 2006 results. According to Stanford researchers, "most of these small particles in murine bone marrow were not cells but the debris of dead cells or living cells incapable of becoming any other cell". In fact, Dr Irving Weissman stressed that, "Our results clearly refute the fact that the VSEL cells in studies conducted in mice have the potential of embryonic stem cells and seriously challenge the potential clinical application of VSEL cells in humans". He added that, "My impression is that very few scientists involved in stem cell research attribute any form of credibility to these studies on VSEL cells". 

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