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Trafficking, acidification, and growth factor signaling

Christof Niehrs1, Michael Boutros

  • 11German Cancer Research Center (DKFZ), DKFZ-Zentrum für Molekulare Biologie der Universität Heidelberg (ZMBH) Alliance, Division of Molecular Embryology, Im Neuenheimer Feld 581, D-69120 Heidelberg, Germany. niehrs@dkfz.de

Science Signaling
|August 12, 2010
PubMed

Insights

Endocytosis is crucial for Wnt and Notch signaling pathways. Acidification within vesicles is essential for these pathways, suggesting new therapeutic targets by modulating acidifying enzymes.

Area of Science:

  • Cell biology
  • Molecular signaling
  • Developmental biology

Background:

  • Wnt and Notch signaling pathways are critical in development and disease.
  • The precise mechanisms of signal transduction for their receptor-ligand complexes are not fully understood.
  • Endocytosis is known to be required for downstream signaling in both pathways, but how it facilitates signaling remains unclear.

Purpose of the Study:

  • To investigate the role of endocytosis and vesicular acidification in Wnt and Notch signaling.
  • To elucidate the mechanism by which endocytosis enables signal transduction in these pathways.
  • To explore potential therapeutic interventions targeting acidifying enzymes.

Main Methods:

  • Investigated the requirement of endocytosis for Wnt and Notch signaling.
  • Examined the role of acidified vesicular compartments in signal transduction.
  • Studied the interaction of acidifying enzymes with Wnt and Notch receptors.

Main Results:

  • Endocytosis is necessary for receptor-ligand complexes to enter acidified vesicular compartments.
  • Enzymes responsible for acidification are essential for both Wnt and Notch signaling.
  • These acidifying enzymes directly interact with the Wnt and Notch receptors.

Conclusions:

  • Acidification within vesicular compartments is a key mechanism by which endocytosis promotes Wnt and Notch signaling.
  • The findings suggest a novel mechanism for signal transduction involving low pH.
  • Targeting acidifying enzymes presents a potential new strategy for therapeutic intervention in Wnt and Notch-related diseases.

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