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A pluripotent stem cell-based model for post-implantation human amniotic sac development.

Yue Shao1, Kenichiro Taniguchi2, Ryan F Townshend2

  • 1Department of Mechanical Engineering, University of Michigan, Ann Arbor, MI, 48109, USA.

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|August 9, 2017
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Summary

Researchers developed a novel human pluripotent stem cell (hPSC) model to study early amniotic sac development. This model, the post-implantation amniotic sac embryoid (PASE), mimics key human embryogenesis events and reveals insights into amniotic sac formation.

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Area of Science:

  • Developmental Biology
  • Stem Cell Biology
  • Human Embryology

Background:

  • Amniotic sac development is crucial for human embryogenesis and pregnancy.
  • The precise mechanisms regulating early human amniotic sac formation remain poorly understood.
  • Existing models do not fully recapitulate post-implantation human embryonic development.

Purpose of the Study:

  • To develop a human pluripotent stem cell (hPSC)-based model for studying post-implantation amniotic sac development.
  • To investigate the self-organization and developmental events within the early human amniotic sac.
  • To explore the role of signaling pathways in amniotic sac formation.

Main Methods:

  • Generation of a post-implantation amniotic sac embryoid (PASE) model from hPSCs.
  • Observation of self-organization into an epithelial cyst with asymmetric patterning.
  • Analysis of posterior primitive streak development and BMP-SMAD signaling.
  • Manipulation of BMP-SMAD signaling to assess its impact on PASE development.

Main Results:

  • The PASE model recapitulates key post-implantation embryogenic events, including asymmetric amniotic sac formation.
  • PASE self-organizes into an epithelial cyst resembling the human amniotic sac structure.
  • SNAI1-dependent posterior primitive streak development and asymmetric BMP-SMAD signaling were observed.
  • Modulation of BMP-SMAD signaling affects the stability of PASE development.

Conclusions:

  • Human pluripotent stem cells possess previously unrecognized potential for forming amniotic sac structures.
  • The PASE model provides a valuable platform for studying human embryology and amniotic sac development.
  • Asymmetric BMP-SMAD signaling is critical for stable amniotic sac development in vitro.