Linked Life Data

8167945

Source:http://linkedlifedata.com/resource/pubmed/id/8167945

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
5
pubmed:dateCreated
1994-6-1
pubmed:abstractText
Cytolysins are the most commonly occurring toxins among bacteria, plants, and animals. By distributing cell membrane, they impair ionic permeability, leading to cell death. In an attempt to investigate cytolysin action on catecholaminergic neurons, we have treated pheochromocytoma cell cultures with Streptolysin S, Staphylococcus aureus alpha and delta, Stoichatus, Parcelsin, and cobra direct lytic factor. To measure neurotoxicity, PC12 cultures were loaded with 51Cr and exposed for 1 hr at 37 degrees C to different concentrations of cytolysins. Cytotoxic dose-response curves have been generated resulting in CD50 (cytotoxic dose 50%) in the range of 1-50 micrograms toxin/culture. Using subcytotoxic concentrations of cytolysins (which are of clinical relevance), changes on intracellular calcium were measured by Fura-2 fluorescence technique. Addition of either Stoichatus toxin and tetanolysin or streptococcus and staphylococcus cytolysins to PC12 cells caused rapidly or gradually a progressive increase in [Ca2+]i, respectively. Under similar conditions, samples of PC12 culture medium were assayed for 3H-arachidonic acid released and by radioimmunoassay for the content of PGE2 (prostaglandin), TXB2 (stable metabolite of thromboxane), and 5-HETE (hydroxy acid lipoxygenase product). PLA2 was activated 4.5-6.0-fold and the levels of all three eicosanoids were increased by 2.5-9-fold (PGE2), 4-6-fold (TXB2), and over 100-fold (5-HETE) by Stoichatus and Parcelsin cytolysins. Upon treatment with Streptolysin S and staphylococcus delta toxins PLA2 (phospholipase A2) was slightly activated (1.5-fold) and the levels of PGE2 and TXB2 increased 1.3-2.0-fold and that of 5-HETE up to 30-fold.(ABSTRACT TRUNCATED AT 250 WORDS)
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:issn
1056-9014
pubmed:author
pubmed:issnType
Print
pubmed:volume
1
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
263-70
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
1993
pubmed:articleTitle
Cytolysins increase intracellular calcium and induce eicosanoids release by pheochromocytoma PC12 cell cultures.
pubmed:affiliation
Department of Pharmacology and Experimental Therapeutics, School of Pharmacy, Faculty of Medicine, Hebrew University of Jerusalem, Israel.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't