The cell giveth and the cell taketh away: An overview of Notch pathway activation by endocytic trafficking of ligands and receptors

Emily B. Pratt, Jill S. Wentzell, Julia E. Maxson, Lauren Courter, Dennis Hazelett, Jan L. Christian

Research output: Contribution to journalReview articlepeer-review

23 Scopus citations


Notch signaling is firmly established as a form of cell-to-cell communication that is critical throughout development. Dysregulation of Notch has been linked to cancer and developmental disorders, making it an important target for therapeutic intervention. One aspect of this pathway that sets it apart from others is its apparent reliance on endocytosis by signal-sending and signal-receiving cells. The subtle details of endocytosis-mediated molecular processing within both ligand- and receptor-presenting cells that are required for the Notch signal to maintain fidelity remain unclear. The endosomal system has long been known to play an important role in terminating signal transduction by directing lysosomal trafficking and degradation of cell surface receptors. More recently, endocytic trafficking has also been shown to be critical for activation of signaling. This review highlights four models of endocytic processing in the context of the Notch pathway. In ligand-presenting cells, endocytosis may be required for pre-processing of ligands to make them competent for interaction with Notch receptors and/or for exerting a pulling force on the ligand/Notch complex. In receptor-presenting cells, endocytosis may be a prerequisite for Notch cleavage and thus activation and/or it could be a means of limiting ligand-independent Notch activation. Recent advances in our understanding of how and why endocytosis of Notch receptors and ligands is required for activation and termination of signaling during normal development and in disease states are discussed.

Original languageEnglish (US)
Pages (from-to)248-255
Number of pages8
JournalActa Histochemica
Issue number3
StatePublished - May 2011


  • DSL ligands
  • Endocytosis
  • Notch
  • Receptor
  • Signaling

ASJC Scopus subject areas

  • Histology
  • Cell Biology


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