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Related Concept Videos

Induced Pluripotent Stem Cells01:13

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Stem cells are undifferentiated cells that divide and produce different types of cells. Ordinarily, cells that have differentiated into a specific cell type are post-mitotic—that is, they no longer divide. However, scientists have found a way to reprogram these mature cells so that they “de-differentiate” and return to an unspecialized, proliferative state. These cells are also pluripotent like embryonic stem cells—able to produce all cell types—and are therefore...
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Gastrulation establishes the three primary tissues of an embryo: the ectoderm, mesoderm, and endoderm. This developmental process relies on a series of intricate cellular movements, which in humans transforms a flat, “bilaminar disc” composed of two cell sheets into a three-tiered structure. In the resulting embryo, the endoderm serves as the bottom layer, and stacked directly above it is the intermediate mesoderm, and then the uppermost ectoderm. Respectively, these tissue strata...
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Related Experiment Video

Updated: Aug 17, 2025

A Novel Culture Model for Human Pluripotent Stem Cell Propagation on Gelatin in Placenta-conditioned Media
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Defined Microenvironments Trigger In Vitro Gastrulation in Human Pluripotent Stem Cells.

Pallavi Srivastava1,2,3, Sara Romanazzo1, Chantal Kopecky1,3

  • 1School of Chemistry, Australian Centre for NanoMedicine, University of New South Wales, Sydney, NSW, 2052, Australia.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|December 15, 2022
PubMed
Summary

Constraining stem cells to hydrogel islands triggers early embryo development stages, mimicking gastrulation without added chemicals. This material-based approach initiates key cellular changes for in vitro developmental models.

Keywords:
embryogenesisgastrulationhydrogelmicropatterningpluripotent stem cells

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Area of Science:

  • Developmental Biology
  • Stem Cell Biology
  • Biomaterials Science

Background:

  • Gastrulation establishes the three germ layers essential for the human body plan.
  • Current in vitro gastrulation models rely on soluble morphogens.
  • In vivo gastrulation involves complex interactions between soluble gradients and biophysical forces.

Purpose of the Study:

  • To investigate if material constraints alone can trigger gastrulation-like morphogenesis in pluripotent stem cells.
  • To develop an in vitro model of early embryonic development using biomaterials.
  • To explore the role of biophysical forces in initiating gastrulation.

Main Methods:

  • Constraining pluripotent stem cells on hydrogel islands of specific sizes.
  • Observing cellular morphology, proliferation, and marker expression (YAP, SOX17, T/BRACHYURY).
  • Performing molecular profiling and pathway analysis to identify signaling mechanisms.

Main Results:

  • Hydrogel island constraints induced a contractile cell phenotype, enhanced proliferation, and YAP translocation.
  • Epithelial to mesenchymal transition and emergence of SOX17+/T/BRACHYURY+ cells were observed.
  • Mechanotransduction-coupled WNT signaling was identified as a key orchestrator of differentiation.

Conclusions:

  • Materials alone can initiate key stages of gastrulation in vitro, bypassing the need for exogenous morphogens.
  • This biomaterial-based approach provides a novel platform for studying early human development.
  • The method offers a valuable tool for advancing organoid bioengineering and regenerative medicine efforts.