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Examination of Drosophila Larval Tracheal Terminal Cells by Light Microscopy
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Regulated Breathless receptor tyrosine kinase activity required to pattern cell migration and branching in the

T Lee1, N Hacohen, M Krasnow

  • 1Department of Biological Chemistry, Johns Hopkins School of Medicine, Baltimore, Maryland 21205-2185, USA.

Genes & Development
|November 15, 1996
PubMed

Insights

The Drosophila FGF receptor homolog, Breathless (BTL), guides tracheal cell migration during embryonic development. Spatially regulated BTL activity directs cell movement, while its quantity influences branching patterns.

Area of Science:

  • Developmental Biology
  • Cell Signaling

Background:

  • Receptor tyrosine kinases (RTKs) regulate crucial cellular processes, including cell fate, differentiation, and migration.
  • Recent studies link RTKs to cell and axon motility, and chemotactic guidance.

Purpose of the Study:

  • To investigate the role of the Drosophila FGF receptor homolog, Breathless (BTL), in guiding tracheal cell migration.
  • To determine if BTL activity influences branching morphogenesis in the embryonic tracheal system.

Main Methods:

  • Studied the effects of constitutively active BTL expression in developing Drosophila tracheas.
  • Assessed the impact of reducing endogenous BTL signaling on tracheal cell migration and branching.

Main Results:

  • Constitutively active BTL disrupted directed tracheal cell migration and increased ectopic branching.
  • Reduced BTL signaling exacerbated cell migration defects but suppressed ectopic branching.

Conclusions:

  • Spatially regulated BTL activity is crucial for guiding tracheal cell migration.
  • Quantitatively regulated BTL activity determines the pattern of secondary and terminal branching cell fates.

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