Transcriptome analysis of endothelial cell gene expression induced by growth on matrigel matrices: identification and characterization of MAGP-2 and lumican as novel regulators of angiogenesis
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Remodeling of vascular microenvironments during normal and tumor-induced angiogenesis is an important, yet poorly understood mechanism by which endothelial cells (ECs) contribute to the activation or resolution of angiogenesis. We used microarray analyses to monitor changes in the transcriptome of ECs undergoing angiogenesis when cultured onto Matrigel matrices. This strategy identified 308 genes whose expression in ECs was altered at least 3-fold by angiogenesis, of which 63 genes were found to encode for secretory proteins. In vitro assays that modeled key steps in the angiogenic process showed that several identified genes possessed pro- or anti-angiogenic activities (e.g., SMOC-2, secreted modular calcium-binding protein-2; CRELD-2, cysteine-rich with EGF-like domains-1; MAGP-2, microfibril-associated glycoprotein-2; lumican; and ECM-1, extracellular matrix protein-1). In particular, MAGP-2 expression potentiated EC proliferation and p38 MAPK activation stimulated by the pro-angiogenic factors, basic fibroblast growth factor (bFGF), epidermal growth factor (EGF), and vascular endothelial growth factor (VEGF); it also stimulated EC invasion and angiogenic sprouting, and more importantly, promoted the development and infiltration of vessels into Matrigel plugs implanted into genetically normal mice. Conversely, lumican inhibited EC activation of p38 MAPK, as well as their invasion, angiogenic sprouting, and vessel formation in mice. Collectively, our findings provide new insights into how EC stromal remodeling regulates angiogenesis activation and resolution, as well as identify two novel EC-secreted stromal proteins that modulate angiogenesis both in vitro and in vivo.
KeywordsAngiogenesis Lumican MAGP-2 Microarray analyses Microenvironment remodeling Stroma
Members of the Schiemann Laboratory are thanked for critical reading of the manuscript. This research was supported in part by grants from the National Institutes of Health (CA095519) and the Cancer League of Colorado to W.P.S., and by a fellowship from the National Institutes of Health (CA99321) to A.R.A.
- 11.Albig AR, Schiemann WP (2005) Identification and characterization of regulator of G protein signaling 4 (RGS4) as a novel inhibitor of tubulogenesis: RGS4 inhibits mitogen-activated protein kinases and vascular endothelial growth factor signaling. Mol Biol Cell 16:609–625CrossRefPubMedGoogle Scholar
- 12.Schenk PM, Baumann S, Mattes R, Steinbiss HH (1995) Improved high-level expression system for eukaryotic genes in Escherichia coli using T7 RNA polymerase and rare ArgtRNAs. Biotechniques 19:196–198, 200Google Scholar
- 24.Bell SE, Mavila A, Salazar R, Bayless KJ, Kanagala S, Maxwell SA, Davis GE (2001) Differential gene expression during capillary morphogenesis in 3D collagen matrices: regulated expression of genes involved in basement membrane matrix assembly, cell cycle progression, cellular differentiation and G-protein signaling. J Cell Sci 114:2755–2773PubMedGoogle Scholar
- 38.Lapointe J, Li C, Higgins JP, van de Rijn M, Bair E, Montgomery K, Ferrari M, Egevad L, Rayford W, Bergerheim U, Ekman P, DeMarzo AM, Tibshirani R, Botstein D, Brown PO, Brooks JD, Pollack JR (2004) Gene expression profiling identifies clinically relevant subtypes of prostate cancer. Proc Natl Acad Sci USA 101:811–816CrossRefPubMedGoogle Scholar
- 40.Hamada T, McLean WH, Ramsay M, Ashton GH, Nanda A, Jenkins T, Edelstein I, South AP, Bleck O, Wessagowit V, Mallipeddi R, Orchard GE, Wan H, Dopping-Hepenstal PJ, Mellerio JE, Whittock NV, Munro CS, van Steensel MA, Steijlen PM, Ni J, Zhang L, Hashimoto T, Eady RA, McGrath JA (2002) Lipoid proteinosis maps to 1q21 and is caused by mutations in the extracellular matrix protein 1 gene (ECM1). Hum Mol Genet 11:833–840CrossRefPubMedGoogle Scholar
- 45.Han Z, Ni J, Smits P, Underhill CB, Xie B, Chen Y, Liu N, Tylzanowski P, Parmelee D, Feng P, Ding I, Gao F, Gentz R, Huylebroeck D, Merregaert J, Zhang L (2001) Extracellular matrix protein 1 (ECM1) has angiogenic properties and is expressed by breast tumor cells. FASEB J 15:988–994CrossRefPubMedGoogle Scholar
- 54.Gibson MA, Finnis ML, Kumaratilake JS, Cleary EG (1998) Microfibril-associated glycoprotein-2 (MAGP-2) is specifically associated with fibrillin-containing microfibrils but exhibits more restricted patterns of tissue localization and developmental expression than its structural relative MAGP-1. J Histochem Cytochem 46:871–886PubMedGoogle Scholar
- 63.Iacobuzio-Donahue CA, Ashfaq R, Maitra A, Adsay NV, Shen-Ong GL, Berg K, Hollingsworth MA, Cameron JL, Yeo CJ, Kern SE, Goggins M, Hruban RH (2003) Highly expressed genes in pancreatic ductal adenocarcinomas: a comprehensive characterization and comparison of the transcription profiles obtained from three major technologies. Cancer Res 63:8614–8622PubMedGoogle Scholar