- Jan 20, 2001
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Finding a Cellular Neverland: How Stem Cells Stay Childlike (excerpts . . . but it's a short article and worthy of reading yourself)
By extension, if we did not have embryonic stem cell research we may have never discovered Nanog.
In the broader context, this is why you fund basic research. It may be decades before an actual therapy evolves from this work but the outcomes will be revolutionary. No drug or biologics company will make that kind of investment in the public good. We used to be able to depend on the government to do it. Unfortunately, they have other priorities these days.
The significance is that it may be possible to get adult stem cells to do this trick as well. Accordingly, we would have a greatly reduced need for embryonic stem cells.Despite their celebrated "immortality," the capacity of embryonic stem (ES) cells for endless division has its limits.
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How some ES cells succeed in recapturing lost cellular innocence and start anew once they begin maturing is described in a forthcoming study in Proceedings of the National Academy of Sciences, authored by a team of scientists from the Salk Institute for Biological Studies.
By extension, if we did not have embryonic stem cell research we may have never discovered Nanog.
Or we can invade Iraq . . ."Embryonic stem cells represent enormous hope for treating otherwise incurable diseases," says Belmonte. "But before we can design therapeutic strategies or introduce these cells into patients, we must learn how to differentiate them into specific cell types and how to tame their formidable proliferating ability," he explains.
In application, you would take a few of the remaining functional cells in a person with Parkinson or Type I diabetes . . . send them back to a precursor stage . . . allow them to replicate . . . and then differentiate back into dopamine neurons or beta cells.In a study published earlier this year, the same Belmonte and Gage lab team demonstrated that a few ES cells in a culture dish tended to lose stemness and evolve into muscle cell precursors, most likely goaded by a muscle differentiation factor known as BMP. But when those maturing cells were forced to produce Nanog, they reverted to their naïve state and regained pluripotency.
Can you imagine . . . lose a hand; grow a new one . . . early kidney failure; grow a new one!Identifying the Nanog/Smad1 feedback loop indeed has significant implications for regenerative medicine. Animals like salamanders readily regenerate severed limbs as adults, but mammals cannot. In fact, mammals have a limited repertoire of tissues they can regenerate, and some essential ones, such as nerves and cardiac muscle, are not on that list.
In the broader context, this is why you fund basic research. It may be decades before an actual therapy evolves from this work but the outcomes will be revolutionary. No drug or biologics company will make that kind of investment in the public good. We used to be able to depend on the government to do it. Unfortunately, they have other priorities these days.
