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The intestinal epithelial lining rapidly renews every 4 to 5 days. The renewal is facilitated by intestinal stem cells (ISCs) located at the base of the crypt– a gland located at the bottom of each villus. ISCs divide asymmetrically to form new stem cells and progenitor daughter cells. The daughter cells are called transit-amplifying (TA) cells which move upwards along the crypt and either differentiate into absorptive cells– the enterocytes or secretory cells– including the...
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Improved Swiss-rolling Technique for Intestinal Tissue Preparation for Immunohistochemical and Immunofluorescent Analyses
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Transit-Amplifying Cells Coordinate Changes in Intestinal Epithelial Cell-Type Composition.

Laura E Sanman1, Ina W Chen1, Jake M Bieber2

  • 1Department of Pharmaceutical Chemistry, University of California, San Francisco, San Francisco, CA 94158, USA.

Developmental Cell
|January 23, 2021
PubMed
Summary
This summary is machine-generated.

This study reveals how intestinal stem cells control the balance of absorptive and secretory cells. Manipulating transit-amplifying cell proliferation directly impacts the ratio of these vital cell types.

Keywords:
cell-type compositionhigh-throughput platformintestinal epitheliumlineage modelorganoidsystems biology

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Area of Science:

  • Cell biology
  • Tissue regeneration
  • Stem cell research

Background:

  • Renewing tissues maintain composition through progenitor and differentiated cells.
  • Understanding microenvironmental signal interpretation is key to tissue homeostasis.
  • Intestinal epithelium renewal involves complex signaling pathways.

Purpose of the Study:

  • To investigate intestinal epithelial responses to single and combined signaling pathway perturbations.
  • To identify conditions that modulate specific intestinal cell types.
  • To elucidate the role of transit-amplifying cells in regulating differentiated cell ratios.

Main Methods:

  • Utilized enteroid monolayers for high-throughput screening.
  • Employed quantitative imaging to analyze cell populations.
  • Perturbed eight distinct epithelial signaling pathways individually and in pairs.

Main Results:

  • Identified specific conditions that enrich for distinct intestinal cell types.
  • Discovered interactions between different signaling pathways.
  • Demonstrated that modulating transit-amplifying cell proliferation alters the secretory to absorptive cell ratio.

Conclusions:

  • Transit-amplifying cells play a crucial, underappreciated role in fine-tuning differentiated cell composition.
  • Microenvironmental signals are interpreted to coordinate tissue-cell-type composition.
  • Insights into intestinal regeneration mechanisms can be gained through pathway modulation studies.