Morality of use of human embryonic stem cells in research - Brief Article
Concurring, Rep. Diana DeGette (D-Colo.) said in the weekly radio address issued by the Democrats, "The president's veto had nothing to do with morals, but rather more to do with "the kind of politics that snuffs out the candle of hope" condemning "the disabled and the sick. As pointed out in an article published Oct. 30, 2004 in the California-based, Orange County Register, entitled: Infertile couples wrestle with stem-cell research, "Embryonic stem-cell research involves blastocysts, the bundle of up to 150 undifferentiated cells that exist within the first five days after a sperm fertilizes an egg. To retrieve stem cells scientists must remove the inner cell mass of the blastocyst, place it in a culture and allow some of those cells to replicate themselves indefinitely. These cells ...
Embryonic stem cells are harvested from a developing embryo in the blastocyst stage destroying the embryo-a human life. "Adult stem cells, on the other hand, are found in all tissues of the growing human being and, according to latest reports, also have the potential to transform themselves into practically all other cell types, or revert to being stem cells with greater reproductive capacity." Great strides have been made in the use of adult stem cells. Successful treatments for maladies ranging from sickle cell disease to Parkinson's disease and blindness haVe been found in adult stem cells. Research is also, vancing quickly on induced pluripotent stem cells. "Induced pluripotent stem cells are created by inserting genes into ordinary skin cells. These iPS cells have the same properti...
... derived from the inner cell mass of blastocyst stage human embryos, are capable of dividing witho...
Last year, scientists at Advanced Cell Technologies published a paper in Nature demonstrating proof of the principle that embryonic stem cell lines could be propagated by removing just one cell from a blastocyst. The link between the MMR vaccine and autism that Andrew Wakefield suggested, and Hwang Woo-Suk's claim that he cloned human embryos attracted investigative journalists, producing revelations that contributed to the repudiation of both researchers' work.
Already removed umbilical cords still contain stem cells identical to the newborn; these are multipotent and can develop into a smaller range of cells. Adult stem cells, which are present from infancy, are also multipotent. Multipotent cells, obviously, offer scientists far less control over the creation of new cells than pluripotent cells. That's the beauty of them-they can become anything they set their little minds to. (If they had minds.) Embryos are comprised of a group of stem cells that group into what's called the blastocyst, which forms in the days following fertilization. These stem cells are referred to as "totipotent" at fertilization, meaning they have the "total potential" to become any kind of cell in the body.
In addition to recounting his run-in with the former pilot, the young investigator included pictures of mating mice and one of himself sitting on the lap of Janet Rossant, his graduate school advisor at Mount Sinai Hospital in Toronto - a tradition, apparently (www.sickkids.ca/rossant/movies/LapPhotos.mov). Kunath presented his work on trophoblast stem (TS) cell lines, which are derived not from the inner cell mass of a blastocyst as in traditional embryonic stem cells, but from the trophectoderm, the outer sphere of epithelial cells that generally develops into placenta! structures and other tissues necessary for fetal development.
During his confirmation hearings to serve as the next chief justice of the U.S. Supreme Court, John Roberts will hear many questions like Do you believe the Constitution contains a right to privacy? and In your opinion, was Roe vs. Wade properly decided? However, a question that Roberts almost certainly will not hear is Can you explain what a blastocyst is? Or How does functional magnetic imaging work?
... stage of development (the so-called blastocyst stage) these cells become pluripotent, and may the...
... (four to five-day) embryo called the blastocyst. (9) Once removed from the blastocyst, the cells o...
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