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    Bush Administration Defends Limits on Stem Cell Research

    WebMD Health News

    Aug. 10, 2001 (Washington) -- In the wake of President Bush's long-awaited and closely watched announcement Thursday night that the U.S. government would fund tightly limited research on human embryonic stem cells, federal health officials claimed that the restrictions would still allow great scientific advances against terrible diseases and disabilities.

    But scientists said that Bush's controls would stymie research, even as "pro-life" groups complained that the president had opened the door to killing for the sake of medical progress.

    Embryonic stem cells are unspecialized, self-renewing cells. Scientists believe that they can multiply and manipulate the cells so that they transform into brain, heart, pancreas, or many other types of cells.

    In his speech, Bush said that he would not publicly fund studies on cell populations, or cell lines, that do not already exist, arguing that that would cross a moral line in tying government dollars to continued destruction of human embryos and "its potential for life." But he will fund studies using whatever stem cell lines have been proven to exist as of his announcement.

    To obtain stem cells, researchers must destroy embryos that are about five days old and contain about 50 to 100 total cells.

    Bush surprised the science community by announcing that there are more than 60 already existing cell lines, as many believed the number was as low as a dozen.

    Health and Human Services Secretary Tommy Thompson said Friday that the 60-plus lines are sufficient to potentially allow significant advances in science, noting that only between three and 12 cell lines were used to sequence the human genome.

    Thompson said that the stem cell lines already in existence are "viable," "robust," and "diverse," and he suggested Friday that it was probable that even more existing lines will come to light.

    Ruth Kirschstein, MD, the acting director of the National Institutes of Health, said, "The approach [Bush] has outlined is sound. Using the more than 60 existing cell lines from around the world, many more researchers will now be able to explore the potential of embryonic stem cells."

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