Linked Life Data

2963750

Source:http://linkedlifedata.com/resource/pubmed/id/2963750

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
2
pubmed:dateCreated
1988-3-25
pubmed:abstractText
Acetyl-CoA acetyltransferase (1-O-alkyl-sn-glycero-3-phosphocholine) is a key enzyme in paf-acether biosynthesis. Its immunological activation as related to paf-acether formation was investigated in mast cells derived from mouse bone marrow. The action of ketotifen, a prophylactic anti-asthma drug, on the antigen-induced activation of acetyltransferase and on the release of paf-acether and beta-hexosaminidase was studied in mast cells. Mast cells were sensitized with dinitrophenyl-specific monoclonal IgE and preincubated for 15 min at 37 degrees C with various concentrations of ketotifen or vehicle prior to challenge with dinitrophenyl coupled to bovine serum albumin (40 ng/ml). Acetyltransferase activity and mediator formation and release were measured. Ketotifen inhibited dose dependently the antigen-induced paf-acether formation and release, beta-hexosaminidase release and acetyltransferase stimulation. The IC50 values were 20.0 +/- 4.4, 11.8 +/- 6.2, 8.8 +/- 3.8 and 20.5 +/- 3.4 microM (mean +/- S.E.M., n = 3) respectively. Mast cells were preincubated with 50 microM ketotifen for 15 min at 37 degrees C then washed prior to antigen challenge. The release of paf-acether and beta-hexosaminidase and the stimulation of acetyltransferase were inhibited by 90.0 +/- 15.0, 91.0 +/- 15.0 and 88.0 +/- 11.0% (n = 3) respectively. In addition, Ca2+ entry was inhibited by 100% as assessed from Quin-2 fluorescence. Thus, the release of a preformed granular enzyme beta-hexosaminidase is inhibited by ketotifen together with the enzymatic formation of a newly formed mediator.(ABSTRACT TRUNCATED AT 250 WORDS)
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Dec
pubmed:issn
0014-2999
pubmed:author
pubmed:issnType
Print
pubmed:day
1
pubmed:volume
144
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
133-9
pubmed:dateRevised
2007-11-15
pubmed:meshHeading
pubmed:year
1987
pubmed:articleTitle
Ketotifen inhibits paf-acether biosynthesis and beta-hexosaminidase release in mouse mast cells stimulated with antigen.
pubmed:affiliation
INSERM U.200, Université Paris-Sud, France.
pubmed:publicationType
Journal Article, In Vitro, Research Support, Non-U.S. Gov't