title: Endothelial lumen signaling complexes control 3D matrix-specific tubulogenesis through interdependent Cdc42- and MT1-MMP-mediated events.
abstract: Here, we define an endothelial cell (EC) lumen signaling complex involving Cdc42, Par6b, Par3, junction adhesion molecule (Jam)-B and Jam-C, membrane type 1-matrix metalloproteinase (MT1-MMP), and integrin alpha(2)beta(1), which coassociate to control human EC tubulogenesis in 3D collagen matrices. Blockade of both Jam-B and Jam-C using antibodies, siRNA, or dominant-negative mutants completely interferes with lumen and tube formation resulting from a lack of Cdc42 activation, inhibition of Cdc42-GTP-dependent signal transduction, and blockade of MT1-MMP-dependent proteolysis. This process requires interdependent Cdc42 and MT1-MMP signaling, which involves Par3 binding to the Jam-B and Jam-C cytoplasmic tails, an interaction that is necessary to physically couple the components of the lumen signaling complex. MT1-MMP proteolytic activity is necessary for Cdc42 activation during EC tube formation in 3D collagen matrices but not on 2D collagen surfaces, whereas Cdc42 activation is necessary for MT1-MMP to create vascular guidance tunnels and tube networks in 3D matrices through proteolytic events. This work reveals a novel interdependent role for Cdc42-dependent signaling and MT1-MMP-dependent proteolysis, a process that occurs selectively in 3D collagen matrices and that requires EC lumen signaling complexes, to control human EC tubulogenesis during vascular morphogenesis.
authors.affiliation: Department of Medical Pharmacology and Physiology, University of Missouri School of Medicine, Columbia, MO 85212, USA.
authors.forename: Anastasia
authors.initials: A
authors.lastname: Sacharidou
authors.forename: Wonshill
authors.initials: W
authors.lastname: Koh
authors.forename: Amber N
authors.initials: AN
authors.lastname: Stratman
authors.forename: Anne M
authors.initials: AM
authors.lastname: Mayo
authors.forename: Kevin E
authors.initials: KE
authors.lastname: Fisher
authors.forename: George E
authors.initials: GE
authors.lastname: Davis
mesh_terms: D048868:Adaptor Proteins, Signal Transducing / Q000037:antagonists & inhibitors / Q000378:metabolism; D000906:Antibodies / Q000494:pharmacology; D015815:Cell Adhesion Molecules / Q000378:metabolism; D018797:Cell Cycle Proteins / Q000037:antagonists & inhibitors / Q000378:metabolism; D002478:Cells, Cultured; D003094:Collagen; D042783:Endothelial Cells / Q000201:enzymology*; D006801:Humans; D053511:Matrix Metalloproteinase 14 / Q000378:metabolism*; D008565:Membrane Proteins / Q000037:antagonists & inhibitors / Q000378:metabolism; D018919:Neovascularization, Physiologic / Q000187:drug effects / Q000502:physiology*; D015398:Signal Transduction / Q000187:drug effects / Q000502:physiology*; D020764:cdc42 GTP-Binding Protein / Q000378:metabolism*
chemical_list: D048868:Adaptor Proteins, Signal Transducing; D000906:Antibodies; D015815:Cell Adhesion Molecules; D018797:Cell Cycle Proteins; C448000:JAM3 protein, human; D008565:Membrane Proteins; C509689:PARD3 protein, human; C499657:PARD6A protein, human; D003094:Collagen; D053511:Matrix Metalloproteinase 14; D020764:cdc42 GTP-Binding Protein