title: Synectin-dependent gene expression in endothelial cells.
abstract: Synectin (GIPC1), a receptor scaffold protein, has been isolated by our laboratory as a syndecan-4 cytoplasmic domain binding partner that regulates important aspects of cell motility (Gao Y, Li M, Chen W, Simons M. J Cell Physiol 184: 373-379, 2000; Tkachenko E, Elfenbein A, Tirziu D, Simons M. Circ Res 98: 1398-1404, 2006). Moreover, synectin plays a major role in arterial morphogenesis and in growth factor signaling in arterial endothelial cells by regulating Rac1 activity (Chittenden TW, Claes F, Lanahan AA, Autiero M, Palac RT, Tkachenko EV, Elfenbein A, Ruiz de Almodovar C, Dedkov E, Tomanek R, Li W, Westmore M, Singh J, Horowitz A, Mulligan-Kehoe MJ, Moodie KL, Zhuang ZW, Carmeliet P, Simons M. Dev Cell 10: 783-795, 2006). The present study was carried out to characterize changes in synectin-dependent gene expression induced by homozygous disruption of the gene in endothelial cells. Using a combination of suppression subtraction hybridization and high throughput microarray technology, we have identified aberrant biological processes of transcriptional regulation in synectin(-/-) primary endothelial cells including abnormal basal regulation of genes associated with development, cell organization and biogenesis, intracellular tracking, and cell adhesion. Analysis of gene expression following FGF2 treatment demonstrated significant abnormalities in transcription, cytoskeletal organization and biogenesis, and protein modification and transport in synectin(-/-) compared with synectin(+/+) endothelial cells. These results confirm synectin involvement in FGF2-dependent signal transduction and provide insights into synectin-dependent gene expression in the endothelium.
authors.affiliation: Angiogenesis Research Center and Section of Cardiology, Department of Medicine, Dartmouth Medical School, Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire 03756, USA.
authors.forename: Anthony A
authors.initials: AA
authors.lastname: Lanahan
authors.forename: Thomas W
authors.initials: TW
authors.lastname: Chittenden
authors.forename: Eileen
authors.initials: E
authors.lastname: Mulvihill
authors.forename: Kimberly
authors.initials: K
authors.lastname: Smith
authors.forename: Stephen
authors.initials: S
authors.lastname: Schwartz
authors.forename: Michael
authors.initials: M
authors.lastname: Simons
mesh_terms: D048868:Adaptor Proteins, Signal Transducing; D000818:Animals; D002352:Carrier Proteins / Q000235:genetics* / Q000502:physiology*; D002448:Cell Adhesion; D002469:Cell Separation; D042783:Endothelial Cells / Q000166:cytology / Q000502:physiology*; D005786:Gene Expression Regulation / Q000187:drug effects; D006321:Heart; D008168:Lung / Q000166:cytology; D051379:Mice; D018345:Mice, Knockout; D009479:Neuropeptides / Q000235:genetics* / Q000502:physiology*; D009693:Nucleic Acid Hybridization / Q000379:methods; D020411:Oligonucleotide Array Sequence Analysis; D051497:Receptor, Fibroblast Growth Factor, Type 2 / Q000494:pharmacology
chemical_list: D048868:Adaptor Proteins, Signal Transducing; D002352:Carrier Proteins; C115271:Gipc1 protein, mouse; D009479:Neuropeptides; C496354:Fgfr2 protein, mouse; D051497:Receptor, Fibroblast Growth Factor, Type 2