Extracellular engagement of ADAM12 induces clusters of invadopodia with localized ectodomain shedding activity

TY - JOUR

T1 - Extracellular engagement of ADAM12 induces clusters of invadopodia with localized ectodomain shedding activity

AU - Albrechtsen, Reidar

AU - Hansen, Dorte Stautz

AU - Sanjay, Archana

AU - Kveiborg, Marie

AU - Wewer, Ulla M

N1 - Copyright © 2010 Elsevier Inc. All rights reserved.

PY - 2011/1/15

Y1 - 2011/1/15

N2 - Invadopodia are dynamic actin structures at the cell surface that degrade extracellular matrix and act as sites of signal transduction. The biogenesis of invadopodia, including the mechanisms regulating their formation, composition, and turnover is not entirely understood. Here, we demonstrate that antibody ligation of ADAM12, a transmembrane disintegrin and metalloprotease, resulted in the rapid accumulation of invadopodia with extracellular matrix-degrading capacity in epithelial cells expressing the αvβ3 integrin and active c-Src kinase. The induction of invadopodia clusters required an intact c-Src interaction site in the ADAM12 cytoplasmic domain, but was independent of the catalytic activity of ADAM12. Caveolin-1 and transmembrane protease MMP14/MT1-MMP were both present in the ADAM12-induced clusters of invadopodia, and cholesterol depletion prevented their formation, suggesting that lipid-raft microdomains are involved in the process. Importantly, our data demonstrate that ADAM12-mediated ectodomain shedding of epidermal growth factor receptor ligands can occur within these invadopodia. Such localized growth factor signalling offers an interesting novel biological concept highly relevant to the properties of carcinoma cells, which often show upregulated ADAM12 and β3 integrin expression, together with high levels of c-Src kinase activity.

AB - Invadopodia are dynamic actin structures at the cell surface that degrade extracellular matrix and act as sites of signal transduction. The biogenesis of invadopodia, including the mechanisms regulating their formation, composition, and turnover is not entirely understood. Here, we demonstrate that antibody ligation of ADAM12, a transmembrane disintegrin and metalloprotease, resulted in the rapid accumulation of invadopodia with extracellular matrix-degrading capacity in epithelial cells expressing the αvβ3 integrin and active c-Src kinase. The induction of invadopodia clusters required an intact c-Src interaction site in the ADAM12 cytoplasmic domain, but was independent of the catalytic activity of ADAM12. Caveolin-1 and transmembrane protease MMP14/MT1-MMP were both present in the ADAM12-induced clusters of invadopodia, and cholesterol depletion prevented their formation, suggesting that lipid-raft microdomains are involved in the process. Importantly, our data demonstrate that ADAM12-mediated ectodomain shedding of epidermal growth factor receptor ligands can occur within these invadopodia. Such localized growth factor signalling offers an interesting novel biological concept highly relevant to the properties of carcinoma cells, which often show upregulated ADAM12 and β3 integrin expression, together with high levels of c-Src kinase activity.

KW - ADAM Proteins

KW - Actins

KW - Caveolin 1

KW - Cell Line

KW - Cell Membrane

KW - Extracellular Matrix

KW - Humans

KW - Integrin alphaVbeta3

KW - Kidney

KW - Matrix Metalloproteinase 14

KW - Membrane Proteins

KW - Protein Binding

KW - Receptors, Vitronectin

KW - Signal Transduction

KW - Transfection

KW - src-Family Kinases

U2 - 10.1016/j.yexcr.2010.10.003

DO - 10.1016/j.yexcr.2010.10.003

M3 - Journal article

C2 - 20951132

SN - 0014-4827

VL - 317

SP - 195

EP - 209

JO - Experimental Cell Research

JF - Experimental Cell Research

IS - 2

ER -