Linked Life Data

16585191

Source:http://linkedlifedata.com/resource/pubmed/id/16585191

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
7
pubmed:dateCreated
2006-4-4
pubmed:abstractText
Kaposi's sarcoma-associated herpesvirus (KSHV) is linked to three different human cancers: Kaposi's sarcoma, primary effusion lymphoma, and multicentric Castleman's disease. The Kaposi's sarcoma lesion expresses high levels of angiogenic factors and is comprised of a mixed cell population, including endothelial cells that are infected with KSHV. We find that the KSHV K1 protein is expressed in Kaposi's sarcoma lesions and can immortalize and extend the life span of primary human umbilical vein endothelial cells in culture. Vascular endothelial growth factor (VEGF) is critical for the survival of endothelial cells, and we show that expression of K1 in endothelial cells resulted in increased levels of secreted VEGF and the activation of key signaling pathways, including the VEGF/VEGF receptor and the phosphatidylinositol-3'-OH-kinase (PI3K) pathway. The SH2 binding motifs present in the cytoplasmic tail of K1 were critical for K1's ability to activate these pathways. Activation of PI3K by K1 results in activation of Akt kinase and mammalian target of rapamycin and inactivation of the proapoptotic proteins FKHR, glycogen synthase kinase-3, and Bad, which are events indicative of cell survival. Because activation of the PI3K pathway is critical for transformation of many human cells, we suggest that PI3K activation by K1 is involved in endothelial cell immortalization and contributes to KSHV-associated tumorigenesis. We also report that K1 enhances angiogenesis in vivo and increases tumor vasculature and tumor size.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Apr
pubmed:issn
0008-5472
pubmed:author
pubmed:issnType
Print
pubmed:day
1
pubmed:volume
66
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
3658-66
pubmed:dateRevised
2010-11-18
pubmed:meshHeading
pubmed-meshheading:16585191-Animals, pubmed-meshheading:16585191-Cell Survival, pubmed-meshheading:16585191-Cell Transformation, Neoplastic, pubmed-meshheading:16585191-Endothelial Cells, pubmed-meshheading:16585191-Enzyme Activation, pubmed-meshheading:16585191-Humans, pubmed-meshheading:16585191-Mice, pubmed-meshheading:16585191-Neoplasms, Experimental, pubmed-meshheading:16585191-Neovascularization, Pathologic, pubmed-meshheading:16585191-Phosphatidylinositol 3-Kinases, pubmed-meshheading:16585191-Proto-Oncogene Proteins c-akt, pubmed-meshheading:16585191-Signal Transduction, pubmed-meshheading:16585191-Vascular Endothelial Growth Factor A, pubmed-meshheading:16585191-Vascular Endothelial Growth Factor Receptor-2, pubmed-meshheading:16585191-Viral Proteins, pubmed-meshheading:16585191-src Homology Domains
pubmed:year
2006
pubmed:articleTitle
Immortalization of primary endothelial cells by the K1 protein of Kaposi's sarcoma-associated herpesvirus.
pubmed:affiliation
Department of Microbiology and Immunology and Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't, Research Support, N.I.H., Extramural