Turning Back Time on Mice Stem Cells: Implications for California

Does the news that scientists have found a way to reset the clock on adult mice stem cells mean that the California stem cell institute should fold its $3 billion tent and slink off into the night?

A case can be made that announcement reduces the imperative behind CIRM, formed to fund research into human embryonic stem cells because of President Bush's restrictions on federal financing in that area.

But scientists and CIRM are having none of it. Indeed, the Japanese scientist, Shinya Yamanaka of Kyoto University, who made the initial discovery in 2006 predicts that duplicating the procedure in humans would be "more demanding" than the mouse work.

At least three California newspapers visited the subject today, reporting that CIRM and researchers say the development, if ultimately successful, will take years to prove useful in humans and offers just another avenue for potential CIRM funding.

Carl Hall of the San Francisco Chronicle wrote:

"Arlene Chiu, interim chief scientific officer at the California Institute for Regenerative Medicine, the agency in charge of the state's $3 billion stem cell program, said the new work shows a path around a major bottleneck -- the shortage of fresh human eggs available for research.

"'We are interested in new ways of generating pluripotent stem cells,' she said. 'The important thing to us is the product, not the process. But the rarity of eggs is definitely a challenge.'

"Ethical rules in California and other states forbid paying women who undergo the sometimes risky egg-extraction procedures. Harvard's Kevin Eggan, a senior scientist involved in the new experiments, said Wednesday that he and his colleagues have been unable to find even a single egg donor after a year of looking.

"Ethics aside, Eggan said the real reasons his lab pursued an alternative to egg donation 'are really scientific and logistical in nature.' Researchers, he said, are seeking a way to use nonviable embryos.

"In fertility clinics, somewhere between 3 and 10 percent of women's eggs are improperly fertilized, typically with an extra sperm getting inside. That translates into about 15,000 to 50,000 nonviable, one-celled embryos, also known as zygotes."

Steve Johnson of the San Jose Mercury News quoted Christopher Thomas Scott, executive director of Stanford's Program on Stem Cells in Society as saying much more work needs to be done before the techniques can be used in humans:

"To kind of claim that one study is going to do the trick isn't the way that science works."

Johnson also reported that Arnold Kriegstein of UC San Francisco

"... noted that much of the embryonic stem-cell research going on in California involves examining how to turn cells into treatments. Consequently, he said, the knowledge gained from that will be useful no matter which types of cells - embryonic or reprogrammed - ultimately are determined to be best."

Terri Somers of the San Diego Union-Tribune had this on the impact of the latest research announcement.

"'It's really remarkable work . . . and as big as Dolly (the cloned sheep) in lots of ways,” said Alan Robbins, chief technology officer at Novocell, a San Diego-based stem cell company. 'If it can be translated into humans, then it opens up the way for designer embryonic stem cells.'"

Gautam Naik of the Wall Street Journal also put together an excellent piece with a great deal on the background and implications of the research.