November 26, 2007


The End of the Stem-Cell Wars (Ryan T. Anderson, 11/27/07, The Weekly Standard)

Even now, nine years later, embryonic stem cells are thought by many scientists to have greater potential than other types. This reputation persists even though adult stem cells are already used in therapies to treat several diseases and are being tested in hundreds of clinical trials, while not a single embryonic stem cell therapy exists, even in trials.

As anyone familiar with reparative medicine knows, immune rejection is one of the tallest hurdles to clear. The promise of cloning was that therapies could be produced using human embryos cloned directly from the patient--thus resulting in a genetic match. Cloning, it was said, would also provide an unlimited supply of human embryos. But many people thought human cloning with the sole intention to kill crossed an ethical line. In addition, human cloning would require an enormous number of human eggs--which could be obtained only by subjecting donors to painful and potentially dangerous hormonal-stimulation procedures. The fear was that likely "donors" would be poor women undergoing a distasteful procedure solely for the fee.

On August 9, 2001, President Bush waded into this morass. He issued an executive order that opened human embryonic stem cell research to federal funding for the first time ever. The order also restricted that funding, however, to research using existing embryonic stem cell lines: No more embryos would be created and destroyed for taxpayer-funded research. (Contrary to popular belief, Bush's order did not ban anything.) Opposition was fierce, but Bush stood firm.

Amid this controversy, a number of scientists discussed possible alternative sources of embryonic stem cells. William Hurlbut, a professor at Stanford and a member of the President's Council on Bioethics, proposed Altered Nuclear Transfer, a process that produced nonembryonic tumor-like entities that could then be harvested for the equivalent of embryonic stem cells. Some ethicists weren't fully sold, fearing that the tumor-like entities might be deformed embryos. Hurlbut's proposal was then modified, using oocyte cytoplasm to directly reprogram a cell's nucleus to make it pluripotent. Still, some critics were unconvinced. Finally, using mice, a Japanese scientist, Shinya Yamanaka, showed that he could create embryonic stem cells directly from adult cells, and within less than a year his study was replicated and significantly expanded by two separate research groups. Yamanaka went to work to make it happen with human cells.

But outside the scientific community, conventional wisdom held that these alternative sources, while interesting, were being proposed only to provide Bush with political cover during the waning years of his presidency. As soon as a new president was inaugurated, federal funds would flow into human cloning and embryo-destructive research. Or so the story went.

That expectation has now been shattered. Whether or not the next president shares Bush's pro-life convictions, it is highly unlikely that taxpayer funds will go to support embryo destruction, which has become not only unnecessary but also less efficient than the alternatives. That's the story coming out of Cell and Science.

Posted by Orrin Judd at November 26, 2007 12:47 PM
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