Understanding Stem Cell Research
WebMD Live Events Transcript
There has been a lot of discussion about embryonic stem cell research lately. Has the debate left you with questions about the medical potential for control and cures for diseases like Parkinson's, diabetes, and Alzheimer's? Pathologist Michael Shelanski, MD, PhD, joined us on Sept. 22, 2004, to discuss what he and other researchers might find down the stem cell path.
The opinions expressed herein are the guests' alone and have not been reviewed by a WebMD physician. If you have questions about your health, you should consult your personal physician. This event is meant for informational purposes only.
Most scientists feel there is the possibility that they are different from other stem cells; they have greater potential, and if we do not investigate them we could miss the chance to proceed in curative or regenerative medicine, even though it's possible that a stem cell from a nonembryonic source might be able to do as well, but we do not know that. The limitation in access to embryonic stem cells is a bit like trying to fight a battle with one hand tied behind your back. You might find all the strength you need in one hand, but you might find the one hand won't do it.
Nobody among responsible scientists is suggesting embryos be generated, be made, for the purpose of making embryonic stem cells. The interest has been largely in using the large number of banked or frozen embryos from the various in vitro fertilization programs to make the cells, taking the view these will never be children or people; they will either be discarded or, less likely, kept indefinitely in a freezer.
Other people, including a small minority of scientists, either feel this use of an embryo for research is immoral to begin with or are afraid that this will encroach ultimately on the sanctity of life of children, late-term fetuses, and a whole scenario is postulated in which the child and fetus could be at risk, that we will not just stick to these excess embryos; we're going to want to encroach more on fetuses or generate more embryos for the purpose of medical therapy.
The big issue is this is not a scientific question; this is a religious and a national policy question, but not scientific. There's no scientific answer except to say if we do not do the research it's very possible important treatments for Parkinson's, diabetes, ALS, and heart attacks will not be developed, or that they will be developed but developed in other countries where either they will not be available to Americans, either because they start with embryonic cells, or if they are available, they will be at extremely high cost.
While the U.S. is doing little in stem cell research, other countries have made stem cell research a centerpiece of their research programs for the years to come. In the U.S., companies and universities that are not using government funds are also doing embryonic stem cell research, but most of the labs in the country have access to only a very limited number of cell lines. While I do not use any of these lines, there is some debate about how many of them are useful.
How many embryonic stem cell lines are available to scientists today? We hear conflicting reports. And why would variety be important to the research?
When we carry things in the laboratory, things can change, things can be infected, taken from different stages of the embryo, they might divide more quickly or slowly, may be genetically different -- they are different because they come from different genetics. Except the point where the human stem cells come from identical twins, none of these are identical and you don't know which ones will be the best ones.
I do not recall the number, but the International Society of Stem Cell Research felt only 10 to 12 lines were available, and more like eight to 10 were useful. There are more lines available if you're not using federal money. The stem cell group at Harvard has 15 to 20 stem cell lines, but they cannot be used. They were derived from private funds and cannot be used for federal research. Those are owned by Harvard and there may be limitations on the uses to which these cells can be put outside the laboratory. You have to sign an agreement with Harvard to get these cells. At least six months ago the Harvard cell lines were for technical reasons not appropriate to put into humans.
That seems like a very small number of lines to base scientific inquiry on. So the federal restrictions could hamper exploration in this field?
I think very seriously.
For what diseases do you see stem cell research holding the most promise?
I see the stem cells holding promise in: