NATURAL BLOOD from STEM CELLS
Abstract from NYTimes.
Unlike the generation of artificial blood, there are attempts to create natural human blood from stem cells. Good news, given the shortage of blood and the risks of incompatibility and transfusion acquisition of viral diseases, including AIDS. The Darpa (Defense Advanced Research Projects Agency), want to create this blood on the same battlefield. According to Eric E. Bouhassira (Albert Einstein College of Medicine), it's easy to create red blood cells from human embryonic stem cells (hesc). While Advanced Cell Technology, is able to produce 100 billion of these red blood cells, this is still an insufficient number, while just a normal blood unit (450 ml), contains more than 1 trillion cells.
However be good conveyors of oxygen, red blood cells generated from hesc, exhibited some problems because they resemble fetal or embryonic cells are larger, carry nuclei, moving with difficulty and contain different forms of globin. 2 additional problems are the massive use of growth factors that raise costs and the possibility of induced cancer by using gene carried by virus, since at the end will not be used hesc, but pluripotent induced stem cells from adult skin. However most experts believed that the possibility of cancer is invalid because red blood cells have no nucleus.
Unlike the generation of artificial blood, there are attempts to create natural human blood from stem cells. Good news, given the shortage of blood and the risks of incompatibility and transfusion acquisition of viral diseases, including AIDS. The Darpa (Defense Advanced Research Projects Agency), want to create this blood on the same battlefield. According to Eric E. Bouhassira (Albert Einstein College of Medicine), it's easy to create red blood cells from human embryonic stem cells (hesc). While Advanced Cell Technology, is able to produce 100 billion of these red blood cells, this is still an insufficient number, while just a normal blood unit (450 ml), contains more than 1 trillion cells.
However be good conveyors of oxygen, red blood cells generated from hesc, exhibited some problems because they resemble fetal or embryonic cells are larger, carry nuclei, moving with difficulty and contain different forms of globin. 2 additional problems are the massive use of growth factors that raise costs and the possibility of induced cancer by using gene carried by virus, since at the end will not be used hesc, but pluripotent induced stem cells from adult skin. However most experts believed that the possibility of cancer is invalid because red blood cells have no nucleus.
SANGRE NATURAL a partir de CELULAS MADRE
A diferencia de la generación de sangre artificial, existen intentos de crear sangre humana natural, a partir de células madre embrionarias humanas (cmeh). Una buena noticia, dada la escaséz de sangre y los riesgos de incompatibilidad y adquisición de enfermedades virales transfusionales, incluido el Sida. El Darpa (Defense Advanced Research Projects Agency), desea crear esta sangre en el mismo campo de batalla. Según Eric E. Bouhassira (Albert Einstein College of Medicine), es fácil crear glóbulos rojos a partir de células madre embrionarias humanas. Aunque Advanced Cell Technology, es capáz de fabricar 100 billones de estos glóbulos rojos, este es aún un número insuficiente, en tanto solo una unidad normal de sangre (450 ml), contiene más de 1 trillón de células.
No obstante ser buenos transportadores de oxigeno, los glóbulos rojos generados a partir de cmeh, exhiben algunos problemas : semejan células embrionarias o fetales, son mas grandes, portan núcleos, circulan con dificultad y contienen diferentes formas de globina. 2 problemas adicionales, son el empleo masivo de factores de crecimiento que elevarán los costos y la posibilidad de cáncer por el empleo de genes transportados por virus, ya que en última instancia no se emplearán cmeh, sino células madre pluripotentes (de piel adulta), inducidas. No obstante la mayoría de expertos opina que la posibilidad de cáncer es nula dado que los glóbulos rojos generados carecerán de núcleo.
No obstante ser buenos transportadores de oxigeno, los glóbulos rojos generados a partir de cmeh, exhiben algunos problemas : semejan células embrionarias o fetales, son mas grandes, portan núcleos, circulan con dificultad y contienen diferentes formas de globina. 2 problemas adicionales, son el empleo masivo de factores de crecimiento que elevarán los costos y la posibilidad de cáncer por el empleo de genes transportados por virus, ya que en última instancia no se emplearán cmeh, sino células madre pluripotentes (de piel adulta), inducidas. No obstante la mayoría de expertos opina que la posibilidad de cáncer es nula dado que los glóbulos rojos generados carecerán de núcleo.
Labels: Artificial blood, stem cells
0 Comments:
Post a Comment
<< Home