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The matrix protein CCN1 (CYR61) induces apoptosis in fibroblasts
Viktor Todorovicç,
Chih-Chiun Chen,
Nissim Hay, , and
Lester F. Lau
Department of Biochemistry and Molecular Genetics, University of Illinois at Chicago College of Medicine, Chicago, IL 60607
Correspondence to Lester F. Lau: LFLau{at}uic.edu
Abstract:
Integrin-mediated cell adhesion to extracellular matrix proteinsis known to promote cell survival, whereas detachment from thematrix can cause rapid apoptotic death in some cell types. Contraryto this paradigm, we show that fibroblast adhesion to the angiogenicmatrix protein CCN1 (CYR61) induces apoptosis, whereas endothelialcell adhesion to CCN1 promotes cell survival. CCN1 induces fibroblastapoptosis through its adhesion receptors, integrin 6ß1and the heparan sulfate proteoglycan (HSPG) syndecan-4, triggeringthe transcription-independent p53 activation of Bax to rendercytochrome c release and activation of caspase-9 and -3. Neithercaspase-8 activity nor de novo transcription or translationis required for this process. These results show that cellularinteraction with a specific matrix protein can either induceor suppress apoptosis in a cell typespecific manner andthat integrin 6ß1-HSPGs can function as receptorsto induce p53-dependent apoptosis.
Abbreviations used in this paper: DRB, 5,6-dichloro-1-ß-D-ribofuranosylbenzimidazole;FN, fibronectin; HSF, human skin fibroblast; HSPG, heparan sulfateproteoglycan; HUVEC, human umbilical vein endothelial cell;JNK, c-Jun NH2-terminal kinase; LN, laminin; MEF, mouse embryonicfibroblast; PLL, poly-L-lysine; VN, vitronectin.
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