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Glucose absorption and utilization by rat embryos

T H Shepard1, T Tanimura, H W Park

  • 1Department of Pediatrics, Central Laboratory for Human Embryology, University of Washington, Seattle 98195, USA. shephard@max.u.washington.edu

The International Journal of Developmental Biology
|April 1, 1997
PubMed
Summary
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Early rat embryos utilize glucose for development, with higher concentrations promoting neuroepithelial microvilli growth. This glucose-dependent microvilli elongation may impact embryonic development and health.

Area of Science:

  • Developmental biology
  • Embryology
  • Cell biology

Background:

  • Glucose is a critical nutrient for early embryonic development.
  • Embryonic metabolic activity shifts from glycolysis to oxidative phosphorylation.
  • The neuroepithelium undergoes significant structural changes during early development.

Purpose of the Study:

  • To investigate the role of glucose in early embryonic development.
  • To examine the effect of glucose concentration on neuroepithelial structure.
  • To understand the mechanism of glucose-induced microvilli elongation.

Main Methods:

  • Whole embryo culture of rat embryos.
  • In vitro culture of neuroepithelium.
  • Microscopy to observe microvilli length.

Related Experiment Videos

  • Use of specific hexoses and cytochalasin D to probe mechanisms.

    • Main Results:

    • Neuroepithelial microvilli lengthen in response to glucose levels ≥ 50 mg/dl.
    • Shorter microvilli observed at lower glucose concentrations.
    • Only absorbable and phosphorylatable hexoses (d-glucose, 2-deoxyglucose) induced lengthening.
    • Cytochalasin D disrupted microvilli structure, indicating actin involvement.

    Conclusions:

    • Glucose concentration directly influences neuroepithelial microvilli length in early embryos.
    • Microvilli elongation is an active, glucose-dependent process involving actin.
    • This phenomenon may have implications for understanding developmental issues in conditions like diabetes.