title: Experimental anti-angiogenesis causes upregulation of genes associated with poor survival in glioblastoma.
abstract: Vascular endothelial growth factor (VEGF) inhibitors are the most promising anti-angiogenic agents used increasingly in the clinic. However, to be efficient, anti-VEGF agents need to be associated with classic chemotherapy. Exploring gene regulation in tumor cells during anti-angiogenesis might help to comprehend the molecular basis of response to treatment. To generate a defined anti-angiogenic condition in vivo, we transfected human glioma cells with short-interfering RNAs against VEGF-A and implanted them on the chick chorio-allantoic membrane. Gene regulation in avascular tumors was studied using human Affymetrixtrade mark GeneChips. Potentially important genes were further studied in glioma patients. Despite strong VEGF inhibition, we observed recurrent formation of small, avascular tumors. CHI3L2, IL1B, PI3/elafin and CHI3L1, which encodes for YKL-40, a putative prognosticator for various diseases, including cancer, were strongly up-regulated in avascular glioma. In glioblastoma patients, these genes showed coregulation and their expression differed significantly from low-grade glioma. Importantly, high levels of CHI3L1 (p = 0.036) and PI3/elafin mRNA (p = 0.0004) were significantly correlated with poor survival. Cox regression analysis further confirmed that PI3 and CHI3L1 levels are survival markers independent from patient age and sex. Elafin-positive tumor cells were only found in glioblastoma, where they were clustered around necrotic areas. PI3/elafin is strongly induced by serum deprivation and hypoxia in U87 glioma cells in vitro. Our results indicate that anti-angiogenesis in experimental glioma drives expression of critical genes which relate to disease aggressiveness in glioblastoma patients. In particular, CHI3L1 and PI3/elafin may be useful as new prognostic markers and new therapeutic targets.
authors: ELAT (European Laboratory for Angiogenesis and Translational Research), INSERM U920 (ex E0113), Talence, F-33405, France.
authors: Ahlame
authors: A
authors: Saidi
authors: Sophie
authors: S
authors: Javerzat
authors: Akeila
authors: A
authors: Bellahcène
authors: John
authors: J
authors: De Vos
authors: Lorenzo
authors: L
authors: Bello
authors: Vincent
authors: V
authors: Castronovo
authors: Manuel
authors: M
authors: Deprez
authors: Hugues
authors: H
authors: Loiseau
authors: Andreas
authors: A
authors: Bikfalvi
authors: Martin
authors: M
authors: Hagedorn
mesh_terms: D054392:Adipokines; D000328:Adult; D001254:Astrocytoma / Q000098:blood supply / Q000378:metabolism / Q000401:mortality; D014408:Biomarkers, Tumor / Q000235:genetics / Q000378:metabolism*; D001921:Brain / Q000378:metabolism / Q000473:pathology; D001932:Brain Neoplasms / Q000098:blood supply / Q000378:metabolism / Q000401:mortality; D049109:Cell Proliferation; D000071451:Chitinase-3-Like Protein 1; D053492:Elafin / Q000378:metabolism; D005260:Female; D020869:Gene Expression Profiling; D015972:Gene Expression Regulation, Neoplastic; D005909:Glioblastoma / Q000098:blood supply* / Q000378:metabolism / Q000401:mortality*; D006023:Glycoproteins / Q000378:metabolism; D006801:Humans; D007124:Immunoenzyme Techniques; D037102:Lectins; D008297:Male; D008875:Middle Aged; D009389:Neovascularization, Pathologic; D020411:Oligonucleotide Array Sequence Analysis; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D034741:RNA, Small Interfering / Q000494:pharmacology; D020133:Reverse Transcriptase Polymerase Chain Reaction; D015996:Survival Rate; D015854:Up-Regulation; D042461:Vascular Endothelial Growth Factor A / Q000037:antagonists & inhibitors* / Q000235:genetics / Q000378:metabolism
chemical_list: D054392:Adipokines; D014408:Biomarkers, Tumor; C084533:CHI3L1 protein, human; D000071451:Chitinase-3-Like Protein 1; D053492:Elafin; D006023:Glycoproteins; D037102:Lectins; C506806:PI3 protein, human; D012333:RNA, Messenger; D034741:RNA, Small Interfering; C467484:VEGFA protein, human; D042461:Vascular Endothelial Growth Factor A