Linked Life Data

1454881

Source:http://linkedlifedata.com/resource/pubmed/id/1454881

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
4
pubmed:dateCreated
1993-1-7
pubmed:abstractText
The purpose of this work was to gain insight into the role played by platelets and endothelial cells in the development of thrombogenic vascular events, observed after in vivo photodynamic therapy (PDT), by studying the in vitro effects of PDT on isolated human platelets and cultured human and bovine endothelial cells. Exposure to Photofrin II (PII) and light caused platelets to rapidly lose their ability to aggregate. Photofrin II alone at high concentrations also exerted inhibitory effects on aggregation. Endothelial cells exposed to PII- and phthalocyanine (GaCl-PcS2,3 or Zn-PCS1,2)-mediated PDT released potent platelet anti- and disaggregating activity which could be identified as prostacyclin by the following criteria: a close correlation between the time and dose dependent anti-aggregating effects and released 6-keto-PGF1 alpha (the spontaneous hydrolysis product of PGI2, determined by radioimmunoassay), the inhibition of these effects by indomethacin, accumulation of 6-keto-PGF1 alpha metabolite in the media of cells treated with PDT (as determined by HPLC analysis), and the absence of evidence for significant nitric oxide production. This prostacyclin release occurred following plasma membrane damage. Although no pro-aggregating activity was observed, endothelial cells were found to release considerable amounts of arachidonic acid and prostaglandin F2 alpha in response to PDT. These data, which indicate powerful anti-thrombogenic effects in vitro, are in sharp contrast to the vascular effects of PDT in vivo which are characterized by severe platelet aggregation, and imply that the in vivo effects involve additional components of the vascular system.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Oct
pubmed:issn
0031-8655
pubmed:author
pubmed:issnType
Print
pubmed:volume
56
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
513-21
pubmed:dateRevised
2007-11-14
pubmed:meshHeading
pubmed:year
1992
pubmed:articleTitle
Effects of photodynamic treatment of platelets or endothelial cells in vitro on platelet aggregation.
pubmed:affiliation
Division of Radiation Biology, Roswell Park Cancer Institute, Buffalo, NY 14263.
pubmed:publicationType
Journal Article, In Vitro, Research Support, U.S. Gov't, P.H.S., Research Support, Non-U.S. Gov't