Linked Life Data

3223936

Source:http://linkedlifedata.com/resource/pubmed/id/3223936

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
2
pubmed:dateCreated
1989-3-16
pubmed:abstractText
1. Respiration in the parasitic nematode worm Ascaridia galli was inhibited at O2 concentrations in excess of 255 microM, and an apparent Km,O2 of 174 microM was determined. 2. Mitochondria-enriched fractions isolated from the tissues of A. galli have much lower apparent Km,O2 values (approx. 5 microM). They produce H2O2 in the energized state; higher rates of H2O2 production were observed in the presence of the uncoupler carbonyl cyanide m-chlorophenylhydrazone. 3. Antimycin A inhibited respiration in muscle tissue mitochondria by 10%, but had no effect on respiration in gut + reproductive tissue mitochondria; the major portion of respiration in both types of mitochondria could be attributed to an alternative electron-transport pathway. 4. o-Hydroxydiphenyl, an inhibitor of alternative electron-transport pathways, inhibits respiration by 98% and completely inhibits the production of H2O2 in gut-plus-reproductive-tissue mitochondria; respiration and H2O2 production in muscle tissue mitochondria were inhibited by 90 and 86% respectively. 5. Another inhibitor of alternative electron transport, salicylhydroxamic acid, had the same effect as o-hydroxydiphenyl on H2O2 production and respiration in gut-plus-reproductive-tissue mitochondria. However, its effect on muscle tissue mitochondria was complex; a low concentration (0.35 mM) stimulated H2O2 production, whereas 3 mM inhibited respiration by 87% and prevented H2O2 production completely. 6. The similarities between the apparent Km,O2 values for H2O2 production and respiration in muscle mitochondria and in gut-plus-reproductive-tissue mitochondria suggests that the site of H2O2 production on the alternative electron-transport chain is cytochrome 'o'. 7. These results are discussed in relation to potential O2 toxicity in A. galli.
pubmed:commentsCorrections
http://linkedlifedata.com/resource/pubmed/commentcorrection/3223936-238973, http://linkedlifedata.com/resource/pubmed/commentcorrection/3223936-24444, http://linkedlifedata.com/resource/pubmed/commentcorrection/3223936-248319, http://linkedlifedata.com/resource/pubmed/commentcorrection/3223936-3574344, http://linkedlifedata.com/resource/pubmed/commentcorrection/3223936-3632636, http://linkedlifedata.com/resource/pubmed/commentcorrection/3223936-5440916, http://linkedlifedata.com/resource/pubmed/commentcorrection/3223936-6248721, http://linkedlifedata.com/resource/pubmed/commentcorrection/3223936-6615472, http://linkedlifedata.com/resource/pubmed/commentcorrection/3223936-6687666, http://linkedlifedata.com/resource/pubmed/commentcorrection/3223936-6692887, http://linkedlifedata.com/resource/pubmed/commentcorrection/3223936-7235720, http://linkedlifedata.com/resource/pubmed/commentcorrection/3223936-7442710, http://linkedlifedata.com/resource/pubmed/commentcorrection/3223936-845146
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Dec
pubmed:issn
0264-6021
pubmed:author
pubmed:issnType
Print
pubmed:day
1
pubmed:volume
256
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
633-9
pubmed:dateRevised
2009-11-18
pubmed:meshHeading
pubmed:year
1988
pubmed:articleTitle
The O2-dependence of respiration and H2O2 production in the parasitic nematode Ascaridia galli.
pubmed:affiliation
Department of Microbiology, University College, Cardiff, Wales, U.K.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't