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Leech neurogenesis. II. Mesodermal control of neuronal patterns.

S A Torrence1, M I Law, D K Stuart

  • 1Department of Molecular and Cell Biology, University of California, Berkeley 94720.

Developmental Biology
|November 1, 1989
PubMed
Summary

Mesoderm removal in leech embryos disrupts ectodermal cell patterning, affecting neuron organization. However, precursor cells retain their fate, indicating mesoderm provides essential positional cues for proper neuronal development.

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Area of Science:

  • Developmental biology
  • Neuroscience
  • Invertebrate zoology

Background:

  • The glossiphoniid leech Theromyzon rude serves as a model organism for studying embryonic development.
  • Understanding the role of mesoderm in patterning ectodermal derivatives is crucial for developmental biology.

Purpose of the Study:

  • To investigate the impact of mesoderm removal on ectodermal cell differentiation and distribution in Theromyzon rude embryos.
  • To determine the role of mesodermal tissues in guiding neuronal precursor cell positioning and organization.

Main Methods:

  • Surgical elimination of mesoderm from one or both sides of Theromyzon rude embryos.
  • Analysis of ectodermal cell distribution, focusing on identified peripheral and central neurons (5-hydroxytryptamine-containing neurons).

Related Experiment Videos

  • Examination of neurogenesis and axon growth in mesoderm-deprived regions.

    • Main Results:

    • Mesoderm deprivation led to the absence of segmental hemiganglia and disorganized neuronal patterns.
    • Despite positional disruption, 5-hydroxytryptamine neurons differentiated and extended axons.
    • In unilaterally deprived embryos, supernumerary neurons formed from cells crossing the ventral midline, integrating into normal ganglionic structures.

    Conclusions:

    • Ectodermal precursor cells are committed to specific neuronal fates irrespective of their final position.
    • Mesodermal tissues are essential for providing positional information that guides precursor cells to their appropriate locations.
    • This study highlights the inductive role of mesoderm in establishing correct neuronal architecture during leech development.