title: Expression of integrin alphavbeta3 in gliomas correlates with tumor grade and is not restricted to tumor vasculature.
abstract: In malignant gliomas, the integrin adhesion receptors seem to play a key role for invasive growth and angiogenesis. However, there is still a controversy about the expression and the distribution of alpha(v)beta(3) integrin caused by malignancy. The aim of our study was to assess the extent and pattern of alpha(v)beta(3) integrin expression within primary glioblastomas (GBMs) compared with low-grade gliomas (LGGs). Tumor samples were immunostained for the detection of alpha(v)beta(3) integrin and quantified by an imaging software. The expression of alpha(v)beta(3) was found to be significantly higher in GBMs than in LGGs, whereby focal strong reactivity was restricted to GBMs only. Subsequent analysis revealed that not only endothelial cells but also, to a large extent, glial tumor cells contribute to the overall amount of alpha(v)beta(3) integrin in the tumors. To further analyze the integrin subunits, Western blots from histologic sections were performed, which demonstrated a significant difference in the expression of the beta(3) integrin subunit between GBMs and LGGs. The presented data lead to new insights in the pattern of alpha(v)beta(3) integrin in gliomas and are of relevance for the inhibition of alpha(v)beta(3) integrin with specific RGD peptides and interfering drugs to reduce angiogenesis and tumor growth.
authors.affiliation: Department of Neurosurgery, Klinikum Grosshadern, Ludwig-Maximilians-Universität München, Munich, Germany.
authors.forename: Oliver
authors.initials: O
authors.lastname: Schnell
authors.forename: Bjarne
authors.initials: B
authors.lastname: Krebs
authors.forename: Erika
authors.initials: E
authors.lastname: Wagner
authors.forename: Alexander
authors.initials: A
authors.lastname: Romagna
authors.forename: Ambros J
authors.initials: AJ
authors.lastname: Beer
authors.forename: Stefan J
authors.initials: SJ
authors.lastname: Grau
authors.forename: Niklas
authors.initials: N
authors.lastname: Thon
authors.forename: Claudia
authors.initials: C
authors.lastname: Goetz
authors.forename: Hans A
authors.initials: HA
authors.lastname: Kretzschmar
authors.forename: Jörg-Christian
authors.initials: JC
authors.lastname: Tonn
authors.forename: Roland H
authors.initials: RH
authors.lastname: Goldbrunner
mesh_terms: D000818:Animals; D015153:Blotting, Western; D001932:Brain Neoplasms / Q000098:blood supply / Q000378:metabolism* / Q000473:pathology*; D005910:Glioma / Q000098:blood supply / Q000378:metabolism* / Q000473:pathology*; D006801:Humans; D007091:Image Processing, Computer-Assisted; D007150:Immunohistochemistry; D039302:Integrin alphaVbeta3 / Q000096:biosynthesis*; D051379:Mice; D009389:Neovascularization, Pathologic / Q000378:metabolism; D019408:Platelet Endothelial Cell Adhesion Molecule-1 / Q000096:biosynthesis; D016133:Polymerase Chain Reaction; D012333:RNA, Messenger / Q000032:analysis
chemical_list: D039302:Integrin alphaVbeta3; D019408:Platelet Endothelial Cell Adhesion Molecule-1; D012333:RNA, Messenger