STANDARD_NAME PIEPOLI_LGI1_TARGETS_UP SYSTEMATIC_NAME M15008 COLLECTION C2:CGP MSIGDB_URL https://www.gsea-msigdb.org/gsea/msigdb/human/geneset/PIEPOLI_LGI1_TARGETS_UP NAMESPACE AFFY_HG_U95 DESCRIPTION_BRIEF Up-regulated genes in U87 cells (glioblastoma multiforme, GBM) engineered to stably express LGI1 [GeneID=9211]. DESCRIPTION_FULL Disruptions of LGI1 in glioblastoma (GBM) cell lines and LGI1 mutations in families with autosomal dominant epilepsy imply a role for LGI1 in glial cells as well as in neurons. Although we and others could not find LGI1 mutations in malignant gliomas, our initial studies appeared to support the idea that LGI1 is poorly expressed or absent in these tumors. Microarray data suggested that LGI1 could be involved in the control of matrix metalloproteinases, and we found that tumors derived from U87 glioblastoma cells overexpressing LGI1 were less aggressive than U87 control tumors. To our surprise, we observed that LGI1 expression after differentiation of murine neural stem cells was robust in neurons but negligible in glial cells, in agreement with immunohistochemistry studies on rodent brain. This observation could suggest that the variable levels of LGI1 expression in gliomas reflect the presence of neurons entrapped within the tumor. To test this hypothesis, we investigated LGI1 expression in parallel with expression of the neuronal marker NEF3 by real-time PCR on 30 malignant gliomas. Results showed a strong, positive correlation between the expression levels of these two genes (P < 0.0001). Thus, our data confirm that LGI1 is involved in cell-matrix interactions but suggest that its expression is not relevant in glial cells, implying that its role as a tumor suppressor in gliomas should be reconsidered. PMID 16533756 GEOID AUTHORS Piepoli T,Jakupoglu C,Gu W,Lualdi E,Suarez-Merino B,Poliani PL,Cattaneo MG,Ortino B,Goplen D,Wang J,Mola R,Inverardi F,Frassoni C,Bjerkvig R,Steinlein O,Vicentini LM,Brüstle O,Finocchiaro G CONTRIBUTOR Arthur Liberzon CONTRIBUTOR_ORG MSigDB Team EXACT_SOURCE Table 1BS FILTERED_BY_SIMILARITY EXTERNAL_NAMES_FOR_SIMILAR_TERMS EXTERNAL_DETAILS_URL SOURCE_MEMBERS 1035_g_at,208_at,31498_f_at,31599_f_at,31954_f_at,31960_f_at,33047_at,33517_f_at,33671_f_at,33680_f_at,33714_at,34564_at,34575_f_at,34965_at,36232_at,37611_at,38263_at,38627_at,38886_i_at,39592_r_at,41504_s_at,41505_r_at,41722_at GENE_SYMBOLS TIMP3,CTNNA2,GAGE1,MAGEA3,GAGE1,GAGE1,BCL2L11,MAGEA3,GAGE1,GAGE1,HMGB3,EPHA5,MAGEA5P,CST7,FGF13,TNFRSF11B,RYR2,HLF,DIRAS3,FGL2,MAF,MAF,NNT FOUNDER_NAMES