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A stem cell possesses two properties: . Self-renewal is the ability to go through numerous cycles of cell division while still maintaining its undifferentiated state. Stem cells can replicate several times and can result in the formation of two stem cells, one stem cell more differentiated than the other, or two differentiated cells.
Thus, embryonic stem cells are likely to be easier to isolate and grow ex vivo than adult stem cells. [36] Embryonic stem cells divide more rapidly than adult stem cells, potentially making it easier to generate large numbers of cells for therapeutic means. In contrast, adult stem cell might not divide fast enough to offer immediate treatment. [36]
Pluripotent adult stem cells are rare and generally small in number, but they can be found in umbilical cord blood and other tissues. [48] Bone marrow is a rich source of adult stem cells, [49] which have been used in treating several conditions including liver cirrhosis, [50] chronic limb ischemia [51] and endstage heart failure. [52]
A stem cell line is a group of stem cells that is cultured in vitro and can be propagated indefinitely. Stem cell lines are derived from either animal or human tissues and come from one of three sources: embryonic stem cells, adult stem cells, or induced pluripotent stem cells. They are commonly used in research and regenerative medicine.
The morphology and growth factors of these lab induced pluripotent cells, are equivalent to embryonic stem cells, leading these cells to be known as induced pluripotent stem cells (iPS cells). [75] This observation was observed in mouse pluripotent stem cells, originally, but now can be performed in human adult fibroblasts using the same four ...
Research using both hematopoietic adult stem cells and embryonic stem cells has provided insight into the possible mechanisms and methods of treatment for many of these ailments. [56] Fully mature human red blood cells may be generated ex vivo by hematopoietic stem cells (HSCs), which are precursors of red blood cells.
Neural stem cells differentiating to astrocytes (green) and sites of growth hormone receptor shown in red. There are two basic types of stem cell: adult stem cells, which are limited in their ability to differentiate, and embryonic stem cells (ESCs), which are pluripotent and have the capability of differentiating into any cell type.
Naïve pluripotent stem cells (e.g. ESC) and primed pluripotent stem cells (e.g. EpiSC) not only sustain the ability to self-renew but also maintain the capacity to differentiate. [2] Since the cell status is primed to differentiate in EpiSCs, however, one copy of the X chromosome in XX cells (female cells) in EpiSCs is silenced (XaXi).