Linked Life Data

15967463

Source:http://linkedlifedata.com/resource/pubmed/id/15967463

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
4
pubmed:dateCreated
2005-6-28
pubmed:abstractText
Two replicative forms characterize the asexual cycle of the protozoan parasite Toxoplasma gondii: rapidly growing tachyzoites and slowly dividing encysted bradyzoites. The mechanisms that regulate the transition between these two stages are not clearly understood. However, stress inducers that also activate heat shock protein expression can trigger formation of bradyzoites in vitro. Here, we studied the association of the T.gondii Hsp90 with modulation of parasite differentiation and response to stress stimuli using RH DeltaUPRT parasites and the cystogenic strain ME49 and a clone derivative of that strain, PK. Our results show that Hsp90 transcript and protein levels increase under stress or bradyzoite differentiation conditions. Moreover, fluorescence microscopy studies revealed that Hsp90 is present in the cytosol of tachyzoites and both in the nucleus and cytosol of mature bradyzoites, suggesting a correlation between its subcellular organization and these two developmental stages. To further characterize the role for Hsp90 in bradyzoite differentiation, T.gondii tachyzoite mutants that are defective in differentiation showed the same staining pattern as tachyzoites under differentiation conditions. In addition, geldanamycin, a benzoquinone ansamycin antibiotic capable of binding and disrupting the function of Hsp90, blocked conversion both from the tachyzoite to bradyzoite and the bradyzoite to tachyzoite stage, suggesting an essential role for this protein in the regulation of stage interconversion. These results thus suggest Hsp90 may play a role in stage switch.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jul
pubmed:issn
0022-2836
pubmed:author
pubmed:issnType
Print
pubmed:day
22
pubmed:volume
350
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
723-34
pubmed:dateRevised
2008-11-21
pubmed:meshHeading
pubmed:year
2005
pubmed:articleTitle
Toxoplasma gondii Hsp90 is a potential drug target whose expression and subcellular localization are developmentally regulated.
pubmed:affiliation
Laboratorio de Parasitología Molecular, UB2, IIB-INTECH, CONICET-UNSAM, Camino de Circunvalación Laguna Km. 6, C.C 164, (B7130IIWA)Chascomús, Prov. Buenos Aires, Argentina.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't