Use of adult stem cell
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Stem cells obtained from human embryos seem to offer the best chance of new therapies, because unlike other stem cells they have the ability to morph into almost any type of tissue. But researchers complain that political roadblocks are keeping them from determining the full potential of these cells. Six years ago, President Bush limited federally funded research to about 20 viable lines of cells that had been extracted from embryos prior to August 9, The stem cell community has repeatedly called for the restrictions to be lifted, charging that the designated cell colonies have been compromised or corrupted and that failure to ease the ban is hobbling U. But opponents say such research is immoral, because embryos must be destroyed to obtain their cells. Last week, Congress sent legislation to Bush that would allow federally funded scientists to study cells from frozen embryos that fertility clinic patients no longer need and have chosen to donate instead of discard.
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6 Pros and Cons of Adult Stem Cells
Key points about adult versus embryonic stem cells - The Niche
Some tissues in the adult body, such as the epidermis of the skin, the lining of the small intestine , and bone marrow , undergo continuous cellular turnover. The stem cells exist in niches formed by other cells, which secrete substances that keep the stem cells alive and active. Some types of tissue, such as liver tissue, show minimal cell division or undergo cell division only when injured. In such tissues there is probably no special stem-cell population, and any cell can participate in tissue regeneration when required. The epidermis of the skin contains layers of cells called keratinocytes. Only the basal layer, next to the dermis, contains cells that divide. A number of these cells are stem cells, but the majority are transit amplifying cells.
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Adult tissue-resident stem cells—fact or fiction?
The initial concept of regenerative medicine dates all the way back to BC, when Aristotle observed that a lizard could grow back the lost tip of its tail. Slowly over time, humans have grown to understand regenerative medicine, and how it may change the way we treat diseases. It's been only relatively recently that adult non-embryonic stem cell therapy, a type of regenerative medicine, has gathered fast momentum.
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