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Related Experiment Videos

Bmp4 mediates apoptotic cell death in the developing chick eye.

F Trousse1, P Esteve, P Bovolenta

  • 1Departamento de Neurobiologia del Desarollo, Instituto Cajal, Consejo Superior de Investigaciones Cientificas, Madrid 28002, Spain.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|February 13, 2001
PubMed
Summary

Bone morphogenetic protein 4 (BMP4) plays a dual role in chick eye development. BMP4 promotes both cell proliferation and programmed cell death in the dorsal optic cup, contributing to optic cup formation.

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Area of Science:

  • Developmental Biology
  • Molecular Biology
  • Ophthalmology

Background:

  • Bone morphogenetic proteins (BMPs) are implicated in vertebrate development.
  • Previous studies in mice provided incomplete understanding of BMP roles in eye development.

Purpose of the Study:

  • Investigate additional functions of BMP4 in chick optic cup formation.
  • Analyze BMP4 and BMP7 expression patterns during eye development.

Main Methods:

  • Chick embryo as a model system.
  • Analysis of Bmp4 and Bmp7 expression.
  • In toto terminal deoxynucleotidyl transferase-mediated biotinylated UTP nick end-labeling (TUNEL) assay.
  • Optic vesicle cultures with BMP4 and Noggin.
  • BrdU incorporation assays.

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Main Results:

  • Chick lens placode ectoderm expresses high Bmp4, unlike in mice.
  • BMP4, BmprIA, BmprII, and Smad1 are expressed in the dorsal neural retina.
  • BMP4 induces spatiotemporally restricted apoptosis in the dorsal optic cup, alongside Msx1 and Msx2.
  • Local BMP4 activity causes programmed cell death; Noggin inhibits proliferation, while BMP4 enhances it.

Conclusions:

  • BMP4 is crucial for chick eye development.
  • BMP4 promotes both cell proliferation and programmed cell death in the dorsal optic cup.
  • BMP4's dual function contributes to optic cup formation and overall eye development.