title: Thrombospondin 2 potentiates notch3/jagged1 signaling.
abstract: Extracellular thrombospondins (TSP or THBS) and the Notch family of transmembrane receptors share a role in multiple, overlapping cellular functions and participate in developmental signaling and pathological reactions to tissue injury. We demonstrate that TSP2, but not TSP1, enhances the potency of Notch3 signal transduction. In addition, TSP2 reduces cancer cell proliferation in a Notch-ligand dependent fashion. The loss of TSP2 in knock-out mice reduces Notch target gene expression. TSP2 binds directly to Notch3 and Jagged1. TSP1 also binds to Notch3 and Jagged1; however, only TSP2 augments the interaction between Notch3 and Jagged1. These studies demonstrate that the diverse functions of TSP2 may also include a role as an intermediary protein that facilitates transcellular receptor-ligand interactions.
authors.affiliation: Department of Neurology and Molecular, University of Michigan, Ann Arbor, Michigan 48109-5622, USA.
authors.forename: He
authors.initials: H
authors.lastname: Meng
authors.forename: Xiaojie
authors.initials: X
authors.lastname: Zhang
authors.forename: Kurt D
authors.initials: KD
authors.lastname: Hankenson
authors.forename: Michael M
authors.initials: MM
authors.lastname: Wang
mesh_terms: D000818:Animals; D002135:Calcium-Binding Proteins / Q000235:genetics / Q000378:metabolism*; D045744:Cell Line, Tumor; D005786:Gene Expression Regulation / Q000187:drug effects / Q000502:physiology; D036341:Intercellular Signaling Peptides and Proteins / Q000235:genetics / Q000378:metabolism*; D000072100:Jagged-1 Protein; D008565:Membrane Proteins / Q000235:genetics / Q000378:metabolism*; D051379:Mice; D018345:Mice, Knockout; D000071656:Receptor, Notch3; D051880:Receptors, Notch / Q000235:genetics / Q000378:metabolism*; D000072099:Serrate-Jagged Proteins; D015398:Signal Transduction / Q000187:drug effects / Q000502:physiology*; D019700:Thrombospondin 1 / Q000235:genetics / Q000276:immunology / Q000378:metabolism; D019699:Thrombospondins / Q000235:genetics / Q000378:metabolism* / Q000494:pharmacology; D000099262:Thrombospondin 2
chemical_list: D002135:Calcium-Binding Proteins; D036341:Intercellular Signaling Peptides and Proteins; D000072100:Jagged-1 Protein; D008565:Membrane Proteins; D000071656:Receptor, Notch3; D051880:Receptors, Notch; D000072099:Serrate-Jagged Proteins; D019700:Thrombospondin 1; D019699:Thrombospondins; D000099262:Thrombospondin 2; C000606274:Jag1 protein, mouse; C499373:Notch3 protein, mouse