Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
4
pubmed:dateCreated
2009-5-28
pubmed:abstractText
Astrocytomas, particularly high grade astrocytoma, are brain tumors with potent angiogenic activity. Our immnunohistochemical study assessed vascular endothelial growth factor (VEGF), VEGF receptors (Flk-1, and Flt-1), the intermediate filamental protein nestin which plays a role in central nervous system development, and MMP-9, which belongs the family of matrix metalloproteinases implicated in tumor invasion and angiogenesis regulation. We investigated the expression of VEGF, its receptors, nestin and MMP-9 in astrocytomas and their correlation with tumor grade. We used paraffin-embedded samples from 66 patients, 29 with low grade (WHO-grade II) and 37 with high grade (WHO-grade III and IV) astrocytomas. Antibodies against VEGF, Flk-1, Flt1, nestin, CD34 and MMP-9 were used, followed by standard indirect immunohistochemical methods. Expression of Flt-1 and Flk-1 showed no significant differences between low and high grade tumor groups. Expression of VEGF and MMP-9 was increased in the high grade group (p equal to or less than 0.026 and 0.024). Nestin expression in tumor astrocytes and endothelial cells increased in high grade group (p same 0.007 and 0.003). Higher expression of VEGF in high grade astrocytomas may subsequently lead to activation of survival, angiogenesis and migration. Expression of nestin and MMP-9 also suggest their likely role in astrocytoma vascular development and proliferation.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:issn
0028-2685
pubmed:author
pubmed:issnType
Print
pubmed:volume
56
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
284-90
pubmed:dateRevised
2009-11-19
pubmed:meshHeading
pubmed-meshheading:19473053-Adolescent, pubmed-meshheading:19473053-Adult, pubmed-meshheading:19473053-Aged, pubmed-meshheading:19473053-Aged, 80 and over, pubmed-meshheading:19473053-Astrocytoma, pubmed-meshheading:19473053-Brain Neoplasms, pubmed-meshheading:19473053-Child, pubmed-meshheading:19473053-Disease Progression, pubmed-meshheading:19473053-Female, pubmed-meshheading:19473053-Humans, pubmed-meshheading:19473053-Immunoenzyme Techniques, pubmed-meshheading:19473053-Intermediate Filament Proteins, pubmed-meshheading:19473053-Male, pubmed-meshheading:19473053-Matrix Metalloproteinase 9, pubmed-meshheading:19473053-Middle Aged, pubmed-meshheading:19473053-Nerve Tissue Proteins, pubmed-meshheading:19473053-Prognosis, pubmed-meshheading:19473053-Vascular Endothelial Growth Factor A, pubmed-meshheading:19473053-Vascular Endothelial Growth Factor Receptor-1, pubmed-meshheading:19473053-Vascular Endothelial Growth Factor Receptor-2, pubmed-meshheading:19473053-Young Adult
pubmed:year
2009
pubmed:articleTitle
Analysis of VEGF, Flt-1, Flk-1, nestin and MMP-9 in relation to astrocytoma pathogenesis and progression.
pubmed:affiliation
Institute of pathology and Laboratory of Molecualr Pathology, Faculty of Medicine and Dentistry, Palacký University, Hnevotinska 3, Olomouc, CZ-775 15, Czech Republic. ahlob@email.cz
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't