Linked Life Data

2470750

Source:http://linkedlifedata.com/resource/pubmed/id/2470750

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
15
pubmed:dateCreated
1989-6-29
pubmed:abstractText
The effect of immune activation of the serum complement system on the secretory response of human endothelial cells was examined. Exposure of antibody sensitized cultured umbilical vein endothelial cells to human serum resulted in secretion of very high molecular weight multimers of von Willebrand factor which coincided with new surface expression of the intracellular granule membrane protein GMP-140. This response required complement activation through deposition of C5b-9 and was not observed with cells exposed to antibody plus C8-deficient serum or to membrane C5b-8 (in the absence of C9). This C5b-9-induced secretion was observed with minimal cell lysis, as assessed by the release of lactic dehydrogenase. Delayed addition of C8 and C9 to cells exposed to antibody plus C8-deficient serum revealed a rapid decay of membrane C8 binding sites accompanied by loss of the secretory response, suggesting a process of removal or inactivation of nascent C5b67 complexes deposited on the endothelial surface. Membrane assembly of C5b-9 complexes caused an increase in endothelial cytosolic [Ca2+], due to influx across the plasma membrane. This C5b-9-dependent increase in cytosolic [Ca2+] and concomitant von Willebrand factor secretion were both abolished by removal of external calcium. In addition to being linked to the level of external Ca2+, the C5b-9-induced secretory response was partially inhibited by the protein kinase inhibitor, sphingosine. The capacity of the C5b-9 proteins to stimulate endothelial cells to secrete a platelet adhesive protein provides one mechanism for increased platelet deposition at sites of inflammation, and suggests the potential for other functional changes in endothelium exposed to C5b-9 during intravascular complement activation.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
May
pubmed:issn
0021-9258
pubmed:author
pubmed:issnType
Print
pubmed:day
25
pubmed:volume
264
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
9053-60
pubmed:dateRevised
2007-11-14
pubmed:meshHeading
pubmed:year
1989
pubmed:articleTitle
Complement proteins C5b-9 induce secretion of high molecular weight multimers of endothelial von Willebrand factor and translocation of granule membrane protein GMP-140 to the cell surface.
pubmed:affiliation
Cardiovascular Biology Research Program, Oklahoma Medical Research Foundation, Oklahoma City 73104.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S.