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Forming model embryos from stem cells in the lab

may 3, 2018

Scientists from the MERLN Institute and the Hubrecht Institute (KNAW) have successfully created in the laboratory embryo-like structures from mouse stem cells. These model embryos resemble natural ones to the extent that, for the first time, they implant into the uterus and initiate pregnancy. This radically new method opens the door to understanding the first and hidden processes of life, problems of infertility, or the embryonic origin of diseases. This scientific breakthrough has been published in Nature.

Opening the black box of early pregnancy

We still know very little about how early embryos develop, due to their small size (the width of a hair) and inaccessibility in the womb. Such knowledge is however vital as minor flaws at the start of pregnancy can prevent the embryo to implant in utero or contribute to diseases during adult life. Researchers have now discovered how to build model embryos in the laboratory from stem cells. Leader of the scientific team Dr. Nicolas Rivron (MERLN Institute and Hubrecht Institute): ‘Our research helps to understand the perfect path an early embryo must take for a healthy development.’

A conversation between stem cells

The early embryo is a hollow sphere formed by less than a hundred cells. It comprises an outer layer of cells, the future placenta, and a small cluster of inner cells, the future embryo. Stem cell lines representing these inner and outer parts were first cultured independently and largely multiplied in the laboratory. Using engineering technologies researchers then assembled them in a recreated environment that triggered their conversation and self-organisation. While observing the process Dr. Nicolas Rivron noticed that ‘it is the embryonic cells that instruct the placental cells how to organise and to implant in utero. By understanding this molecular conversation, we open new perspectives to solve problems of infertility, contraception, or the adult diseases that are initiated by small flaws in the embryo’. For example, diabetes or cardiovascular diseases.

Benefits of follow-up research

For the first time, it is now possible to form early model embryos in unlimited numbers that implant in utero. Prof. dr. Niels Geijsen, principal investigator at the Hubrecht Institute: ‘We now have a new way to study the earliest stages of embryonic development, and to explore the influence of environmental factors on development and disease.’

Prof. dr. Clemens van Blitterswijk, department chair at the MERLN Institute of Maastricht University: ‘This research opens the path to a new biomedical discipline. We can create large numbers of model embryos and build up new knowledge by systematically testing new medical techniques and potential medicines. It also dramatically reduces the need for animal experimentation’.

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