Linked Life Data

9856869

Source:http://linkedlifedata.com/resource/pubmed/id/9856869

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
6
pubmed:dateCreated
1999-3-17
pubmed:abstractText
After intracerebral injection, some toxic secreted phospholipases A2 (sPLA2) can induce epileptic seizures which bases are currently ill known. We undertook the detailed study of the central neurotoxicity of paradoxin (PDX), an analog of taipoxin, in rodents. Since literature strongly suggests a high variability in the sPLA2 epileptogenic properties, we compared, in an acute model, PDX with crotoxin (CTX), known to induce seizures and that may bind to similar neuronal receptors. Related toxic enzymes (ammodytoxin A, ATX A, and CTX subunit CB) and the non neurotoxic sPLA2 from pancreas and PLA2 analog ammodytin L (AML) were also tested. Despite being highly neurotoxic, PDX did not induce either convulsions or long-lasting seizure fits. The results obtained with the other enzymes showed that toxic sPLA2s can effectively be differentiated based on two criteria: the presence of cortically recorded epileptic paroxysmal discharges (E) and convulsions (C). We thus propose to classify the toxic sPLA2s into different groups depending on their epileptogenic properties: E-C-(PDX), E+C+ (CTX, CB), and E-C+ (ATX A). The non toxic AML and pancreatic enzyme were E-C-. Moreover, the results obtained with AML, and preliminarily with chemically inhibited CB, suggested that phospholipid hydrolysis is important to trigger seizures and convulsions. However, PDX and CTX that possess highly different epileptogenic properties exerted comparable, although slightly different, catalytic activities. Similarly, histological evaluations of the brain of PDX and CTX-treated rats (H&E staining, GFAP immunodetection, hsp70 and c-fos mRNA detection) did not provide satisfactory clues to explain these large differences. Further studies are strongly required.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Dec
pubmed:issn
0360-4012
pubmed:author
pubmed:issnType
Print
pubmed:day
15
pubmed:volume
54
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
848-62
pubmed:dateRevised
2007-11-15
pubmed:meshHeading
pubmed:year
1998
pubmed:articleTitle
Secreted phospholipase A2-induced neurotoxicity and epileptic seizures after intracerebral administration: an unexplained heterogeneity as emphasized with paradoxin and crotoxin.
pubmed:affiliation
Department of Toxicology, Unit of Neuropharmacology, Centre de Recherches du Service de Santé des Armées, La Tronche, France. 100437,201@compuserve.com
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't