Release date: 2017-04-11 The internationally renowned academic journal Cell has published a breakthrough research report on pluripotent stem cells by Peking University's Deng Hongkui research team. They have established a pluripotent stem cell line with pluripotent characteristics for the first time in the world. The obtained cells also have intraembryonic cells. And the developmental potential of extra-embryonic tissue. The most important functional feature of pluripotent stem cells is that they can be chimeric into early embryos and participate in the development of various cell lineages of embryos, but their developmental potential is limited to embryonic internal tissues, and it is difficult to develop into extra-embryonic tissues such as placenta and yolk sac. How to establish and maintain stem cell lines with intraembryonic and extraembryonic development potential in vitro is one of the most challenging problems in the field of stem cell research. This time, Deng Hongkui research team cooperated with the Salk Institute of Biology and the Reproductive Center of the People's Hospital of Peking University, and developed a new culture system to create mice and humans with intraembryonic and extraembryonic development potential. Stem cell line - potential to expand pluripotent stem cells (EPS cells). Surprisingly, a single mouse EPS cell can be efficiently chimeric into the intraembryonic and extraembryonic tissues of different developmental stages of the mouse and develop into various intraembryonic and extraembryonic tissue types. Through the tetraploid compensation technique, the experiments further proved that a single mouse EPS cell can develop into an adult mouse. They also used human-mouse heterogeneous chimeric techniques to analyze the in vivo developmental potential of human EPS cells. After injection of human EPS cells into early mouse embryos, they can stably integrate into mouse embryonic and extraembryonic tissues, and their intra-embryo integration ratio is nearly 20-fold higher than the reported integration efficiency, and at mRNA and protein levels. It was demonstrated that human chimeric cells can differentiate into different cell lineages. Professor Deng Hongkui said in an interview with the Science and Technology Daily that the EPS cells they established for the first time in vitro provide a new tool for studying the molecular mechanisms of mammalian early embryos, especially the development of extraembryonic tissues. The heterogeneous chimeric ability of human EPS cells lays a foundation for the future preparation of human tissues and organs using heterogeneous chimeric techniques, and also provides new possibilities for stem cell technology to treat major diseases. In addition, human and mouse EPS cells can be established using the same culture conditions, becoming a new starting point for the future establishment of stem cell lines with pluripotency in many species. Source: Science and Technology Daily - China Science and Technology Network
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