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Les cellules souches ne sont pas toutes les mêmes


Il existe en fait deux types de cellules souches :

- embryonnaires : elles se trouvent dans l’embryon et possèdent un énorme potentiel car elles sont en mesure de se différencier dans tous les types cellulaires de notre corps (totipotentes). Cependant leur extraction comporte la destruction de l’embryon et pose donc de graves problèmes de nature bioéthique.
- adultes : elles se trouvent dans les organes et tissus du corps humain dès la naissance; elles sont généralement chargées de régénérer l’organe ou le tissu dans lequel elles se trouvent. Les souches « adultes » sont appelées pluripotentes (ou multipotentes), car elles sont en mesure de donner naissance à plusieurs types de cellules.


Les cellules souches du cordon ombilical :
Parmi les cellules souches adultes, les plus intéressantes sont celles que l’on trouve en très forte concentration dans le sang du cordon ombilical (0,3÷0,5% du total) au moment de la naissance, car il s’agit sans doute possible de cellules souches pluripotentes.

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