title: Paired overexpression of ErbB3 and Sox10 in pilocytic astrocytoma.
abstract: Pilocytic astrocytoma (PA) is the most common glioma of childhood. Despite their relatively high incidence, the molecular mechanisms responsible for tumorigenesis and growth of PA are poorly understood. Previous in vitro studies in our laboratory showed that despite the absence of ErbB1, PA was sensitive to ErbB1 tyrosine kinase inhibitor gefitinib. To identify alternative targets of gefitinib in PA, we studied other members of the ErbB receptor tyrosine kinase family that have been identified in brain tumors. Using gene expression microarray and Western blot analyses, we found that ErbB3 is highly overexpressed in PA compared with other pediatric brain tumors (glioblastoma, ependymoma, medulloblastoma, atypical teratoid/rhabdoid tumor, and choroid plexus papilloma). Developmental biology studies have identified Sox10 as a regulator of ErbB3 expression during development of the neural crest. Investigation of Sox10 in PA revealed that it is highly overexpressed relative to other pediatric brain tumors, lending support to the theory that Sox10-regulated overexpression of ErbB3 may be driving growth in PA. Sox10-regulated ErbB3 overexpression is a novel insight into the biology of PA, suggests possible recapitulation of developmental pathways in tumorigenesis, and presents possible targets for therapeutic intervention that might be used for hypothalamic variants not amenable to surgical cure.
authors.affiliation: Department of Pediatrics and Pathology, University of Colorado at Denver and Health Sciences Center (UCDHSC), 80045, USA.
authors.forename: Steven O
authors.initials: SO
authors.lastname: Addo-Yobo
authors.forename: Jennifer
authors.initials: J
authors.lastname: Straessle
authors.forename: Adil
authors.initials: A
authors.lastname: Anwar
authors.forename: Andrew M
authors.initials: AM
authors.lastname: Donson
authors.forename: B K
authors.initials: BK
authors.lastname: Kleinschmidt-Demasters
authors.forename: Nicholas K
authors.initials: NK
authors.lastname: Foreman
mesh_terms: D000293:Adolescent; D001254:Astrocytoma / Q000175:diagnosis / Q000235:genetics* / Q000378:metabolism; D014408:Biomarkers, Tumor / Q000235:genetics*; D015153:Blotting, Western; D001932:Brain Neoplasms / Q000175:diagnosis / Q000235:genetics* / Q000378:metabolism; D002471:Cell Transformation, Neoplastic / Q000235:genetics / Q000378:metabolism; D002675:Child, Preschool; D004268:DNA-Binding Proteins / Q000235:genetics* / Q000378:metabolism; D005260:Female; D020869:Gene Expression Profiling; D015972:Gene Expression Regulation, Neoplastic / Q000235:genetics*; D008040:Genetic Linkage / Q000235:genetics; D005819:Genetic Markers / Q000235:genetics; D020022:Genetic Predisposition to Disease / Q000235:genetics; D006609:High Mobility Group Proteins / Q000235:genetics* / Q000378:metabolism; D006801:Humans; D007029:Hypothalamic Neoplasms / Q000235:genetics / Q000378:metabolism / Q000503:physiopathology; D008297:Male; D009432:Neural Crest / Q000378:metabolism / Q000503:physiopathology; D020411:Oligonucleotide Array Sequence Analysis; D020893:Receptor, ErbB-3 / Q000235:genetics* / Q000378:metabolism; D055757:SOXE Transcription Factors; D014157:Transcription Factors / Q000235:genetics* / Q000378:metabolism
chemical_list: D014408:Biomarkers, Tumor; D004268:DNA-Binding Proteins; D005819:Genetic Markers; D006609:High Mobility Group Proteins; C527923:SOX10 protein, human; D055757:SOXE Transcription Factors; D014157:Transcription Factors; D020893:Receptor, ErbB-3