Linked Life Data

21261628

Source:http://linkedlifedata.com/resource/pubmed/id/21261628

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
3
pubmed:dateCreated
2011-4-26
pubmed:abstractText
Antimicrobial photodynamic therapy (PDT) has recently emerged as an effective modality for the selective destruction of bacteria and other pathogenic microorganisms. We investigated whether PDT induced protective responses such as heat shock proteins (HSPs) in bacteria. Using the photosensitizer Toluidine Blue O (TBO) at sublethal PDT conditions, a seven-fold increase in bacterial HSP GroEL and a three-fold increase in HSP DnaK were observed in Escherichia coli post PDT. Pretreatment with 50°C heat for 30 min reduced PDT killing in both E. coli and in Enterococcus faecalis, with the most pronounced inhibition occurring at 50 ?m TBO with 5 J cm(-2) 635 nm light, where E. coli killing was reduced by 2 log(10) and E. faecalis killing was reduced by 4 log(10). Finally, inhibition of the highly conserved chaperone DnaK using a small molecule benzylidene lactam HSP inhibitor potentiated (but not significantly) the effect of PDT at a TBO concentration of 2.5 ?m in E. faecalis; however, this effect was not observed in E. coli presumably because inhibitor could not gain access due to Gram-negative permeability barrier. Induction of HSPs may be a mechanism whereby bacteria could become resistant to PDT and warrants the need for further study in the application of dual PDT-HSP-inhibition therapies.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:issn
1751-1097
pubmed:author
pubmed:copyrightInfo
© 2011 The Authors. Photochemistry and Photobiology © 2011 The American Society of Photobiology.
pubmed:issnType
Electronic
pubmed:volume
87
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
707-13
pubmed:meshHeading
pubmed:articleTitle
Analysis of the bacterial heat shock response to photodynamic therapy-mediated oxidative stress.
pubmed:affiliation
John Jay High School, Cross River, NY, USA.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, Non-P.H.S., Research Support, Non-U.S. Gov't, Research Support, N.I.H., Extramural