title: CXCR4 and SDF1 expression in human meningiomas: a proliferative role in tumoral meningothelial cells in vitro.
abstract: Chemokines participate in cellular processes associated with tumor proliferation, migration, and angiogenesis. We previously demonstrated that stromal cell-derived factor 1 (SDF1) exerts a mitogenic activity in glioblastomas through the activation of its receptor CXCR4. Here we studied the expression of this chemokine in human meningiomas and its possible role in cell proliferation. Reverse transcriptase-PCR analysis for CXCR4 and SDF1 was performed on 55 human meningiomas (47 WHO grade I, 5 WHO II, and 3 WHO III). Immunolabeling for CXCR4 and SDF1 was performed on paraffin-embedded sections of these tumors. [(3)H]Thymidine uptake and Western blot analyses were performed on primary meningeal cell cultures of tumors to evaluate the proliferative activity of human SDF1alpha (hSDF1alpha) in vitro and the involvement of extracellular signal-regulated kinase 1/2 (ERK1/2) activation in this process. CXCR4 mRNA was expressed by 78% of the tumor specimens and SDF1 mRNA by 53%. CXCR4 and SDF1 were often detected in the same tumor tissues and colocalized with epithelial membrane antigen immunostaining. In 9 of 12 primary cultures from meningiomas, hSDF1alpha induced significant cell proliferation that was strongly reduced by the mitogen-activated protein kinase kinase inhibitor PD98059, involving ERK1/2 activation in the proliferative signal of hSDF1alpha. In fact, CXCR4 stimulation led to ERK1/2 phosphorylation/activation. In addition, the hSDF1alpha-induced cell proliferation was significantly correlated with the MIB1 staining index in the corresponding surgical specimen. In conclusion, we found that human meningiomas express CXCR4 and SDF1 and that hSDF1alpha induces proliferation in primary meningioma cell cultures through the activation of ERK1/2.
authors.affiliation: Department of Oncology, Biology and Genetics, University of Genova, Viale Benedetto XV, 2, 16132 Genova, Italy. adriana.bajetto@unige.it
authors.forename: Adriana
authors.initials: A
authors.lastname: Bajetto
authors.forename: Federica
authors.initials: F
authors.lastname: Barbieri
authors.forename: Alessandra
authors.initials: A
authors.lastname: Pattarozzi
authors.forename: Alessandra
authors.initials: A
authors.lastname: Dorcaratto
authors.forename: Carola
authors.initials: C
authors.lastname: Porcile
authors.forename: Jean Louis
authors.initials: JL
authors.lastname: Ravetti
authors.forename: Gianluigi
authors.initials: G
authors.lastname: Zona
authors.forename: Renato
authors.initials: R
authors.lastname: Spaziante
authors.forename: Gennaro
authors.initials: G
authors.lastname: Schettini
authors.forename: Tullio
authors.initials: T
authors.lastname: Florio
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D015153:Blotting, Western; D002277:Carcinoma / Q000235:genetics / Q000378:metabolism / Q000473:pathology; D049109:Cell Proliferation; D054377:Chemokine CXCL12; D019743:Chemokines, CXC / Q000235:genetics / Q000378:metabolism*; D005260:Female; D015972:Gene Expression Regulation, Neoplastic; D006801:Humans; D007124:Immunoenzyme Techniques; D066298:In Vitro Techniques; D008297:Male; D008577:Meningeal Neoplasms / Q000235:genetics / Q000378:metabolism*; D008579:Meningioma / Q000235:genetics / Q000378:metabolism* / Q000473:pathology; D008875:Middle Aged; D019950:Mitogen-Activated Protein Kinase 1 / Q000378:metabolism; D048052:Mitogen-Activated Protein Kinase 3 / Q000378:metabolism; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D012334:RNA, Neoplasm / Q000235:genetics / Q000378:metabolism; D019718:Receptors, CXCR4 / Q000235:genetics / Q000378:metabolism*; D020133:Reverse Transcriptase Polymerase Chain Reaction; D015398:Signal Transduction; D017154:Stromal Cells / Q000378:metabolism; D014407:Tumor Cells, Cultured
chemical_list: C515255:CXCL12 protein, human; D054377:Chemokine CXCL12; D019743:Chemokines, CXC; D012333:RNA, Messenger; D012334:RNA, Neoplasm; D019718:Receptors, CXCR4; D019950:Mitogen-Activated Protein Kinase 1; D048052:Mitogen-Activated Protein Kinase 3