Linked Life Data

12230324

Source:http://linkedlifedata.com/resource/pubmed/id/12230324

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
9
pubmed:dateCreated
2002-9-16
pubmed:abstractText
Our previous study demonstrated that vascular endothelial growth factor (VEGF), now referred to as VEGF-A, plays a significant role in blood-brain barrier (BBB) breakdown and angiogenesis after brain injury. In this study, VEGF-A expression was compared with that of VEGF-B in the rat cortical cold injury model over a period of 6 hours to 6 days post-injury. VEGF-A and VEGF-B mRNA were detected by in situ hybridization and their protein was detected by immunohistochemistry. The presence of VEGF-A and VEGF-B proteins in endothelium of lesion vessels was related to BBB breakdown by double labeling for either of these growth factors and fibronectin, which was used as a marker of BBB breakdown. Significant induction of both VEGF-A and VEGF-B mRNA occurred at the lesion site during the period of maximal endothelial proliferation. VEGF-A mRNA levels peaked at 3 and 4 days post-injury and returned to basal expression by day 6, while VEGF-B mRNA levels remained elevated up to day 6. VEGF-B protein was constitutively expressed in endothelium of all cerebral vessels. After brain injury, there was increased immunoreactivity for VEGF-B at the lesion site, this protein being present in the endothelium and vascular smooth muscle cells of pial vessels, in inflammatory cells, and later in proliferating endothelial cells, endothelium of neovessels, and astrocytes. Lesion vessels showing BBB breakdown to fibronectin showed endothelial VEGF-A protein but not VEGF-B protein. Constitutive expression of VEGF-B in normal endothelium suggests that it may have a role in maintenance of the BBB in steady states, while its induction at both the gene and protein level post-injury indicates that it has an essential role in angiogenesis and the repair processes after brain injury.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Sep
pubmed:issn
0022-3069
pubmed:author
pubmed:issnType
Print
pubmed:volume
61
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
778-88
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed-meshheading:12230324-Animals, pubmed-meshheading:12230324-Blood-Brain Barrier, pubmed-meshheading:12230324-Brain, pubmed-meshheading:12230324-Brain Injuries, pubmed-meshheading:12230324-Bromodeoxyuridine, pubmed-meshheading:12230324-Disease Models, Animal, pubmed-meshheading:12230324-Endothelial Growth Factors, pubmed-meshheading:12230324-Endothelium, Vascular, pubmed-meshheading:12230324-Fibronectins, pubmed-meshheading:12230324-Immunohistochemistry, pubmed-meshheading:12230324-In Situ Hybridization, pubmed-meshheading:12230324-Male, pubmed-meshheading:12230324-Mitotic Index, pubmed-meshheading:12230324-RNA, Messenger, pubmed-meshheading:12230324-Rats, pubmed-meshheading:12230324-Rats, Wistar, pubmed-meshheading:12230324-Vascular Endothelial Growth Factor A, pubmed-meshheading:12230324-Vascular Endothelial Growth Factor B
pubmed:year
2002
pubmed:articleTitle
Differential expression of vascular endothelial growth factor-A (VEGF-A) and VEGF-B after brain injury.
pubmed:affiliation
Toronto Western Research Institute at University Health Network, Department of Laboratory Medicine, University of Toronto, Ontario, Canada.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't