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Epithelial stem cells in vivo.

C S Potten1, R J Morris

  • 1Paterson Institute for Cancer Research, Christie Hospital, Manchester, UK.

Journal of Cell Science. Supplement
|January 1, 1988
PubMed
Summary
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Cellular topography helps locate stem cells in murine epidermis and small intestinal crypts. Label retention studies identify these long-cycling cells, revealing insights into tissue regeneration and proliferation control.

Area of Science:

  • Stem cell biology
  • Epithelial tissue regeneration
  • Cell kinetics

Background:

  • Cellular topography in polarized epithelia aids in identifying stem cell locations.
  • Stem cell characteristics can be studied precisely in certain epithelial tissues.
  • Existing knowledge on stem cell populations in murine epidermis and small intestinal crypts is reviewed.

Purpose of the Study:

  • To review current knowledge of stem cell populations in murine epidermis and small intestinal crypts.
  • To discuss methods for identifying and studying stem cells based on their location and behavior.
  • To explore cellular hierarchies and proliferation dynamics within these tissues.

Main Methods:

  • Analysis of cellular topography to pinpoint stem cell locations.

Related Experiment Videos

  • Review of label retention studies (tritiated thymidine, radioactive carcinogens) for stem cell identification.
  • Complex modeling of cell kinetic experiments in small intestinal crypts.
  • Radiobiological experiments to assess clonal regeneration capacity.

    • Main Results:

    • In murine epidermis, stem cells constitute ~10% of the basal layer, located centrally within the epidermal proliferative unit.
    • These epidermal stem cells exhibit long cell cycles and retain labels, indicating their role.
    • Small intestinal crypts contain 4-16 functional stem cells, with up to 32 capable of clonal regeneration.
    • The doubling time for the clonogenic cell compartment in the small intestine is 19.7 hours.

    Conclusions:

    • Stem cell location and label retention are key identifiers in epithelial tissues.
    • Heterogeneity within basal layers suggests cellular hierarchies.
    • Studies on stem cell behavior and proliferation kinetics provide insights into tissue regulation.