Linked Life Data

11925037

Source:http://linkedlifedata.com/resource/pubmed/id/11925037

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
4
pubmed:dateCreated
2002-4-1
pubmed:abstractText
Camptothecin, a topo isomerase-I inhibitor used in cancer therapy, induces apoptosis in animal cells. In tomato (Lycopersicon esculentum Mill.) suspension cells, camptothecin induces cell death that is accompanied by the characteristic nuclear morphological changes such as chromatin condensation and nuclear and DNA fragmentation that are commonly associated with apoptosis in animal systems. These effects of camptothecin can effectively be blocked by inhibitors of animal caspases, indicating that, in tomato suspension cells, camptothecin induces a form of programmed cell death (PCD) with similarities to animal apoptosis (A.J. De Jong et al. (2000) Planta 211:656-662). Camptothecin induced cell death was employed to study processes involved in plant PCD. Camptothecin induced a transient increase in H2O2 production starting within 2 h of application. Both camptothecin-induced cell death and the release of H2O2 were effectively blocked by application of the calcium-channel blocker lanthanum chloride, the caspase-specific inhibitor Z-Asp-CH2-DCB, or the NADPH oxidase inhibitor diphenyl iodonium, indicating that camptothecin exerts its effect on cell death through a calcium- and caspase-dependent stimulation of NADPH oxidase activity. In addition, we show that ethylene is an essential factor in camptothecin-induced PCD. Inhibition of either ethylene synthesis or ethylene perception by L-alpha-(2-aminoethoxyvinyl)glycine or silver thiosulphate, respectively, blocked camptothecin-induced H2O2 production and PCD. Although, in itself, insufficient to trigger H2O2 production and cell death, exogenous ethylene greatly stimulated camptothecin-induced H2O2 production and cell death. These results show that ethylene is a potentiator of the camptothecin-induced oxidative burst and subsequent PCD in tomato cells. The possible mechanisms by which ethylene stimulates cell death are discussed.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
http://linkedlifedata.com/resource/pubmed/chemical/Aspartic Acid, http://linkedlifedata.com/resource/pubmed/chemical/Calcium, http://linkedlifedata.com/resource/pubmed/chemical/Calcium Channels, http://linkedlifedata.com/resource/pubmed/chemical/Camptothecin, http://linkedlifedata.com/resource/pubmed/chemical/Caspases, http://linkedlifedata.com/resource/pubmed/chemical/Ethylenes, http://linkedlifedata.com/resource/pubmed/chemical/Glycine, http://linkedlifedata.com/resource/pubmed/chemical/Hydrogen Peroxide, http://linkedlifedata.com/resource/pubmed/chemical/Lanthanum, http://linkedlifedata.com/resource/pubmed/chemical/Mitogen-Activated Protein Kinases, http://linkedlifedata.com/resource/pubmed/chemical/Plant Growth Regulators, http://linkedlifedata.com/resource/pubmed/chemical/Tosyllysine Chloromethyl Ketone, http://linkedlifedata.com/resource/pubmed/chemical/aminoethoxyvinylglycine, http://linkedlifedata.com/resource/pubmed/chemical/benzyloxycarbonyl-Asp-CH2OC(O)-2,6-d..., http://linkedlifedata.com/resource/pubmed/chemical/ethylene, http://linkedlifedata.com/resource/pubmed/chemical/lanthanum chloride
pubmed:status
MEDLINE
pubmed:month
Feb
pubmed:issn
0032-0935
pubmed:author
pubmed:issnType
Print
pubmed:volume
214
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
537-45
pubmed:dateRevised
2009-11-19
pubmed:meshHeading
pubmed:year
2002
pubmed:articleTitle
A critical role for ethylene in hydrogen peroxide release during programmed cell death in tomato suspension cells.
pubmed:affiliation
Agrotechnological Research Institute (ATO), Wageningen University and Research Center, The Netherlands.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't