This article appears in the May 2007 issue of The American Spectator. Click here to subscribe.
If you or a loved one is currently ill or planning to be so in the near future, don’t bother looking to embryonic stem cell (ESC) research to help. Instead, you need to consult the adult stem cell (ASC) literature whereupon you’ll find these little guys currently treat or cure over 70 diseases and conditions even as they’re involved in almost 1,300 human clinical trials.
At this point, all that ESCs hold is promise. They are used in no treatments, cures, or human clinical trials. They are used in raising false hopes and hence money. The University of California, Irvine’s Hans Keirstead, who claims to have used ESCs to cure paralyzed rats, said last year he would start human clinical trials this year. Problem is, he’s been saying “next year” since 2002. Check your calendar. Moreover — and this is typical of ESC researcher grandstanding — his rats weren’t even paralyzed. Rather, as opposed to what he tells reporters, including the late Ed Bradley on 60 Minutes, the injuries were “moderate in severity [and] sparing some hind limb motor function,” as he reported in a medical journal.
ESC lobbyists sniff that ASC research got a big head start. “Researchers began using adult stem cells from bone marrow back in 1960,” claims ReligiousTolerance.org on its website. (Note that the very name furthers the ESC lobby’s goal of portraying all their opponents as religious fanatics.) “It was only in 1998 that other researchers were able to isolate and cultivate embryo stem cells. Adult stem cell research thus has an almost four decade head start compared to embryo-derived stem cells.”
In fact, ASCs and ESCs were both discovered in rodents in the 1950s. But the ASCs — from marrow — were readily adaptable for treating leukemia and other human blood disorders. ESCs, conversely, precisely because of their much-touted flexibility, were so hard to work with that it wasn’t until 1998, in the lab of the University of Wisconsin’s James Thomson, that the first human line of ESCs was created. They remain a real bear to work with, which is why their domain remains primarily the Petri dish.
WHAT IS THE ESC PROMISE and when will these cells and scientists deliver?
Since they are mere days old, ESCs are so malleable as to lend themselves to becoming mature cells from all three germ layers of the human body — about 220 types of cells total. ASCs, because they are more developed, were long thought to be considerably less flexible. That is, you could get marrow from marrow stem cells along with blood, muscle, and an amazing array of other types of mature cells. But you couldn’t get neurons or pancreatic cells because those are in different germ layers.
Two developments, however, have eaten away at this apparent ESC advantage.
The first is that while ASCs were originally identified in marrow, now they’ve been found throughout the body including skin, brains, spinal cords, dental pulp, muscles, blood vessels, corneas, retinas, livers, hair follicles, and umbilical cords. Fat, America’s most inexhaustible resource, contains stem cells that have been converted into more fat (for cosmetic purposes), bone, cartilage, and nerve cells. Importantly, nerve cells are in a different germ layer from fat.
With numerous types of stem cells in all three germ layers, it’s possible we could constitute all 220 cell types (assuming you even need all 220 cell types) without a one-size-fits all ES cell.
The second development is that since 2002 researchers have been discovering ASCs that apparently can be converted to mature cells in all three germ layers, beginning with the University of Minnesota Stem Cell Institute Catherine Verfaillie’s finding, announced in Nature magazine. Others have since used different types of cells from those Verfaillie used, but to the same effect.
THE MOST EXCITING NEWS in this area lately has been the revelation, announced in January, of Anthony Atala’s findings. Atala, a physician and director of the Institute for Regenerative Medicine at Wake Forest University School of Medicine, found that stem cells in the amniotic fluid that fill the sac surrounding the fetus appear to be just as versatile as ESCs. As he told PBS’s NewsHour, “We have been able to drive the cell to what we call all three germ layers, which basically means all three major classes of tissues available in the body, from which all cells come from.”
One advantage of ESCs has been that while most types of adult stem cells cannot be multiplied outside of the body for very long, embryonic ones may replicate in the lab indefinitely. But Atala’s amniotic stem cells grow as fast outside the body as ESCs (doubling every 36 hours), and he’s now been growing the same cell line for two years with no indication of slowing.
ESC researchers have desperately tried to downplay these findings, to the extent that the New York Times, which told readers three years ago that there were no cures or treatments involving ASCs, refused even to mention Atala’s work. Newsweek International did make note of it but claimed, “Many scientists are quick to emphasize that comprehensive human trials are still many years away.”
The magazine is correct only if “years away” means “years ago.” As Atala himself has noted, amniotic stem cells are identical to placental stem cells. The New England Journal of Medicine carried one paper on a placenta stem cell trial back in 1996 and another paper two years later. There’s been an ongoing clinical trial since 2001 to treat sickle cell anemia.
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