Linked Life Data

12580947

Source:http://linkedlifedata.com/resource/pubmed/id/12580947

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
2
pubmed:dateCreated
2003-2-12
pubmed:abstractText
Outer membrane derived vesicles (MVs) secreted by Actinobacillus actinomycetemcomitans JP2 contain a membranolytic leukotoxin and are toxic to human HL60 cells. To determine how MVs interact with human target cells, HL60 cells were incubated with vesicles, reacted with anti-vesicle antibodies and a FITC-labelled reporter, and visualized by confocal scanning laser microscopy. Target cells rapidly became reactive with anti-vesicle antibodies upon exposure to vesicles. Confocal microscopy showed that labelling occurred primarily in the cytoplasmic membrane and that very little internal fluorescence was observed. The cytoplasmic membrane of HL60 cells was also strongly labelled after exposure to MVs that contained the fluorescent phospholipid, SP-DiOC18. In contrast, incubation of cells with free SP-DiOC18 resulted primarily in the labelling of internal structures of HL60 cells. These results suggest that A. actinomycetemcomitans MVs associate with, or are incorporated into the cytoplasmic membrane of HL60 cells. The leukotoxin is a membranolytic cytotoxin and cells exposed to MVs were lysed by vesicle-associated toxin in a time and dose-dependent manner. However, cells became reactive with anti-vesicle antibodies when MVs were added in the presence of inhibitors of leukotoxin-mediated lysis or when sublytic doses of MVs were analysed. In addition, MVs produced by an isogenic leukotoxin-deficient strain of A. actinomycetemcomitans JP2 were non-toxic but rapidly interacted with HL60 cells. These results suggest that A. actinomycetemcomitans MVs can deliver leukotoxin to HL60 cells but that the association of vesicles with the cytoplasmic membrane occurs independently of the leukotoxin polypeptide.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Feb
pubmed:issn
1462-5814
pubmed:author
pubmed:issnType
Print
pubmed:volume
5
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
111-21
pubmed:dateRevised
2007-11-14
pubmed:meshHeading
pubmed:year
2003
pubmed:articleTitle
Interaction of Actinobacillus actinomycetemcomitans outer membrane vesicles with HL60 cells does not require leukotoxin.
pubmed:affiliation
Department of Biochemistry, Levy Research Building, Room 540, University of Pennsylvania School of Dental Medicine, 4010 Locust Street, Philadelphia, PA 19104-6002, USA. demuth@biochem.dental.upenn.edu
pubmed:publicationType
Journal Article, Comparative Study, Research Support, U.S. Gov't, P.H.S., Research Support, Non-U.S. Gov't