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Related Experiment Videos

Nephron induction--the epithelial mesenchymal interface revisited.

R Strehl1, W W Minuth

  • 1Department of Anatomy, University of Regensburg, Universitätsstrasse 31, 93053 Regensburg, Germany.

Pediatric Nephrology (Berlin, Germany)
|February 24, 2001
PubMed
Summary
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Researchers studied neonatal rabbit kidneys to understand nephrogenesis. They discovered a wide cleft filled with a fibrillar meshwork between the collecting duct ampulla and surrounding mesenchyme, challenging previous assumptions of close contact.

Area of Science:

  • Developmental biology
  • Renal embryology
  • Cell biology

Background:

  • Humoral factors are increasingly recognized for their role in nephrogenesis (kidney development).
  • Morphological details of the interface between nephron inducers and surrounding mesenchyme remain poorly understood.
  • Understanding this interface is crucial for elucidating the mechanisms of kidney formation.

Purpose of the Study:

  • To investigate the ultrastructural morphology of the interface between the collecting duct ampulla and the competent mesenchyme in neonatal rabbit kidneys.
  • To examine the spatial relationship between the nephron inducer and surrounding mesenchymal cells during nephron induction.
  • To characterize the extracellular matrix present at this critical developmental interface.

Main Methods:

Related Experiment Videos

  • Scanning electron microscopy (SEM) for surface topography.
  • Transmission electron microscopy (TEM) for ultrastructural details.
  • Examination of the basal aspect of the collecting duct ampulla and adjacent mesenchyme in neonatal rabbit kidneys.

    • Main Results:

    • A wide cleft was observed surrounding the collecting duct ampulla, separating it from the competent mesenchyme.
    • This cleft is not a space for direct cell-cell contact or short-distance diffusion as previously assumed.
    • The cleft is characterized by the presence of a distinct fibrillar meshwork.

    Conclusions:

    • The prevailing assumption of close tissue contact during nephron induction may be inaccurate.
    • A novel anatomical structure, a fibrillar meshwork-filled cleft, exists at the nephron induction site.
    • This finding necessitates a re-evaluation of the mechanisms of signal exchange during kidney development, potentially involving factors acting across this wider space.