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Spatial restriction of bone morphogenetic protein signaling in mouse gastrula through the mVam2-dependent endocytic

Minako Aoyama1, Ge-Hong Sun-Wada, Akitsugu Yamamoto

  • 1Division of Biological Science, Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan.

Developmental Cell
|June 16, 2012
PubMed

Insights

Mouse Vam2 (mVam2) regulates endosomal signaling. mVam2 deficiency disrupts BMP signaling, leading to embryonic patterning defects, revealing the endocytic pathway

Area of Science:

  • Cell Biology
  • Developmental Biology
  • Molecular Biology

Background:

  • Embryonic development relies on precise control of signaling cascades.
  • The role of late endosomes and lysosomes in terminating signal transduction during embryogenesis is not well understood.
  • The endocytic pathway's involvement in regulating developmental signaling requires further investigation.

Purpose of the Study:

  • To investigate the role of the endocytic pathway in regulating developmental signaling.
  • To elucidate the function of mouse Vam2 (mVam2) in membrane trafficking and signaling termination.
  • To determine mVam2's role in the spatiotemporal modulation of Bone Morphogenetic Protein (BMP) signaling during embryogenesis.

Main Methods:

  • Genetic modification of the mouse Vam2 (mVam2) locus.
  • Analysis of mVam2-deficient cells and embryos.
  • Investigation of signaling termination pathways, including TGF-β, EGF, and BMP-Smad1/Smad5.
  • Identification of mVam2 interactions with the BMP type I receptor.

Main Results:

  • mVam2-deficient cells displayed fragmented late endosomal compartments.
  • Mutant cells failed to terminate BMP-Smad1/Smad5 signaling upon growth factor removal.
  • mVam2-deficient embryos showed ectopic BMP signaling activation and disrupted embryonic patterning.
  • mVam2 interacts with the BMP type I receptor and is crucial for its sequestration in late endosomes.

Conclusions:

  • The endocytic pathway, specifically mVam2, plays a critical role in regulating developmental signaling.
  • mVam2 is essential for the proper termination and spatiotemporal control of BMP signaling.
  • Disruption of mVam2 function leads to aberrant BMP signaling and embryonic patterning defects.

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