title: Expression of cell adhesion proteins and proteins related to angiogenesis and fatty acid metabolism in benign, atypical, and anaplastic meningiomas.
abstract: Most meningiomas are benign tumours of arachnoidal origin, although a small number have high proliferative rates and invasive properties which complicate complete surgical resection and are associated with increased recurrence rates. Few prognostic indicators exist for meningiomas and further research is necessary to identify factors that influence tumour invasion, oedema and recurrence. Paraffin sections from 25 intracranial meningiomas were analysed for expression of the proteins vascular endothelial growth factor (VEGF), VEGF receptors Flt1 and Flk1, E-cadherin, metalloproteinases 2 and 9 (MMP2, MMP9), CD44, receptor for hyaluronic acid-mediated motility (RHAMM), hyaluronic acid (HA), CD45, cyclooxygenase 2 (COX2), brain fatty acid binding protein (BFABP), Ki67, and proliferating cell nuclear antigen (PCNA). Correlations among protein expression were found for several markers of proliferation (Ki67, PCNA, MI) and microvessel density (MVD). COX2 expression increased with increasing with tumour grade and correlated with Ki67, PCNA, MI, MVD, and BFABP. BFABP expression also correlated with Ki67 and PCNA expression. Relationships were also identified among angiogenic factors (VEGF, Flt1, Flk1) and proliferation markers. Oedema was found to correlate with MMP9 expression and MMP9 also correlated with proliferation markers. No correlations were found for MMP2, E-cadherin, or CD44 in meningiomas. In conclusion Ki67, PCNA, MI, MVD, BFABP, and COX2 were significantly correlated with meningioma tumour grade and with each other. These findings, by correlating both intracellular fatty acid transport and eicosanoid metabolism with tumour proliferation, as determined by Ki67 labelling and mitotic index, suggest fatty acids are involved in the progression of meningiomas.
authors.affiliation: Department of Neurosurgery, Santa Casa Hospital, São Paulo, Brazil.
authors.forename: Alexandros Theodoros
authors.initials: AT
authors.lastname: Panagopoulos
authors.forename: Carmen Lucia Penteado
authors.initials: CL
authors.lastname: Lancellotti
authors.forename: José Carlos Esteves
authors.initials: JC
authors.lastname: Veiga
authors.forename: Paulo Henrique Pires
authors.initials: PH
authors.lastname: de Aguiar
authors.forename: Alison
authors.initials: A
authors.lastname: Colquhoun
mesh_terms: D000328:Adult; D000368:Aged; D014408:Biomarkers, Tumor / Q000032:analysis / Q000378:metabolism*; D015815:Cell Adhesion Molecules / Q000032:analysis / Q000096:biosynthesis*; D049109:Cell Proliferation; D002648:Child; D051546:Cyclooxygenase 2 / Q000032:analysis / Q000378:metabolism; D015777:Eicosanoids / Q000378:metabolism; D005227:Fatty Acids / Q000378:metabolism*; D005260:Female; D006801:Humans; D019394:Ki-67 Antigen / Q000032:analysis / Q000378:metabolism; D008297:Male; D008577:Meningeal Neoplasms / Q000098:blood supply / Q000378:metabolism* / Q000473:pathology; D008579:Meningioma / Q000098:blood supply / Q000378:metabolism* / Q000473:pathology; D008833:Microcirculation / Q000378:metabolism; D008875:Middle Aged; D009363:Neoplasm Proteins / Q000032:analysis / Q000096:biosynthesis*; D009389:Neovascularization, Pathologic / Q000378:metabolism* / Q000503:physiopathology; D018809:Proliferating Cell Nuclear Antigen / Q000032:analysis / Q000378:metabolism
chemical_list: D014408:Biomarkers, Tumor; D015815:Cell Adhesion Molecules; D015777:Eicosanoids; D005227:Fatty Acids; D019394:Ki-67 Antigen; D009363:Neoplasm Proteins; D018809:Proliferating Cell Nuclear Antigen; D051546:Cyclooxygenase 2; C496540:PTGS2 protein, human