Document Detail

Singlet-Oxygen-Mediated Cell Death using Spatially-Localized Two-Photon Excitation of an Extracellular Sensitizer.
MedLine Citation:
PMID:  22857396     Owner:  NLM     Status:  Publisher    
Controlling and quantifying the photosensitized production of singlet oxygen are key aspects in mechanistic studies of oxygen-dependent photoinitiated cell death. In this regard, the commonly accepted practice of using intracellular photosensitizers is, unfortunately, plagued by problems that include the inability to accurately (1) quantify the sensitizer concentration in the irradiated domain, and (2) control the local environment that influences light delivery and sensitizer photophysics. On the other hand, capitalizing on the fact that singlet oxygen produced outside a cell is also cytotoxic, many of these problems can be avoided with the use of an extracellular sensitizer. For the present study, a hydrophilic dendrimer-encased membrane-impermeable sensitizer was used to generate an extracellular population of singlet oxygen upon spatially-localized two-photon irradiation. Through the use of this sensitizer and this approach, it is now possible to better control the singlet oxygen "dose" in microscope-based time- and space-resolved single cell experiments. Thus, we provide a solution to a limiting problem in mechanistic studies of singlet-oxygen-mediated cell death.
Frederico M Pimenta; Rasmus Lybech Jensen; Lotte Holmegaard; Tatiana V Esipova; Michael Westberg; Thomas Breitenbach; Peter R Ogilby
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-8-2
Journal Detail:
Title:  The journal of physical chemistry. B     Volume:  -     ISSN:  1520-5207     ISO Abbreviation:  J Phys Chem B     Publication Date:  2012 Aug 
Date Detail:
Created Date:  2012-8-3     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101157530     Medline TA:  J Phys Chem B     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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