Scientists have already successfully developed pluripotent stem cells in the lab, cells which can form any type of tissue. Totipotent stem cells are the pinnacle for stem cell scientists, however. And for the first time, researchers have found a way to engineer them.

Unlike pluripotent stem cells, totipotent stem cells can form tissues that provide embryonic support, or extra-embryonic tissues, like the placenta and amniotic sac.

In a study published this week in the journal Cell, a team scientists from California's Salk Institute and Peking University, in China, announced the production of totipotent stem cells from cultured mouse and human stem cells.

"This is the first study reporting the derivation of a stable stem cell type that shows totipotent-like bi-developmental potential towards both embryonic and extra-embryonic lineages," Juan Carlos Izpisua Bemonte, a researcher and professor at Salk, said in a news release.

New cells typically divide into pluripotent and totipotent stem cells early in the development process. Researchers created a chemical cocktail capable of stabilizing stem cells prior to division, effectively prolonging the stem cell's versatility. Researchers dubbed stabilize cells "extended pluripotent stem cells," or EPS cells.

"The discovery of EPS cells provides a potential opportunity for developing a universal method to establish stem cells that have extended developmental potency in mammals," said Jun Wu, a senior scientist at Salk. "Importantly, the superior interspecies chimeric competency of EPS cells makes them especially valuable for studying development, evolution and human organ generation using a host animal species."

Using the new chemical cocktail, researchers cultured mouse stem cells capable of forming both embryonic and extra-embryonic cells. The stem cells were better able to form chimeras, a collection of embryonic cells from different zygotes. Scientists also showed a single stem cell cultured in the new concoction -- a combination of four chemicals and a growth factor -- could be used to grow an entire adult mouse, an unprecedented feat.

"We believe that the derivation of a stable stem cell line with totipotent-like features will have a broad and resounding impact on the stem cell field," concluded Izpisua Belmonte.

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The most productive way scientists have devised to nurture colonies of human embryonic stem cells is to do so atop a bed of mouse cells. That may be fine for lab research, but it poses an unacceptable contamination risk for stem cells intended for transplant into human patients. In a new study, Brown University bioengineers have developed a synthetic bed that works about as well as the mouse cel ... read more

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