title: Canonical and non-canonical Notch ligands.
abstract: Notch signaling induced by canonical Notch ligands is critical for normal embryonic development and tissue homeostasis through the regulation of a variety of cell fate decisions and cellular processes. Activation of Notch signaling is normally tightly controlled by direct interactions with ligand-expressing cells, and dysregulated Notch signaling is associated with developmental abnormalities and cancer. While canonical Notch ligands are responsible for the majority of Notch signaling, a diverse group of structurally unrelated noncanonical ligands has also been identified that activate Notch and likely contribute to the pleiotropic effects of Notch signaling. Soluble forms of both canonical and noncanonical ligands have been isolated, some of which block Notch signaling and could serve as natural inhibitors of this pathway. Ligand activity can also be indirectly regulated by other signaling pathways at the level of ligand expression, serving to spatiotemporally compartmentalize Notch signaling activity and integrate Notch signaling into a molecular network that orchestrates developmental events. Here, we review the molecular mechanisms underlying the dual role of Notch ligands as activators and inhibitors of Notch signaling. Additionally, evidence that Notch ligands function independent of Notch is presented. We also discuss how ligand posttranslational modification, endocytosis, proteolysis, and spatiotemporal expression regulate their signaling activity.
authors.affiliation: Department of Biological Chemistry, David Geffen School of Medicine, University of California, Los Angeles, CA, USA.
authors.forename: Brendan
authors.initials: B
authors.lastname: D'Souza
authors.forename: Laurence
authors.initials: L
authors.lastname: Meloty-Kapella
authors.forename: Gerry
authors.initials: G
authors.lastname: Weinmaster
mesh_terms: D000818:Animals; D006801:Humans; D008024:Ligands; D011499:Protein Processing, Post-Translational; D051880:Receptors, Notch / Q000737:chemistry* / Q000378:metabolism*; D015398:Signal Transduction
chemical_list: D008024:Ligands; D051880:Receptors, Notch
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