| Spatial control of reactive oxygen species formation in fibroblasts using two-photon excitation. | |
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MedLine Citation:
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PMID: 15339206 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Two-photon excitation (2PE) provides a means of generating reactive oxygen species (ROS) in cells and tissues with a high degree of spatial specificity. In cultured monolayers of human fibroblasts and fibroblast-derived cells treated with the commonly used probe of ROS formation, 5-(and 6)-chloromethyl-2',7'-dichlorodihydrofluorescein diacetate, acetyl ester (CM-H(2)DCFDA), cells irradiated through a microscope objective with 150 fs near-infrared laser pulses became highly fluorescent, reflecting intracellular ROS formation. The fluorescence intensity inside cells increased quadratically with the average power of radiation for pulsed excitation and was unchanged for continuous wave irradiation with the same average power. Single fibroblasts embedded within dermal equivalents were also targeted in this manner and formed ROS, whereas neighboring unirradiated cells were spared. These results demonstrate that ROS can be generated intracellularly in skin cells using 2PE of the metabolic or oxidative products of CM-H(2)DCFDA and that formation of ROS can be localized in both cell monolayers and in a tissue equivalent. This technique should be useful in understanding the response of whole tissues such as skin to local generation of ROS and may have applications in photodynamic therapy. |
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Authors:
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Brett A King; Dennis H Oh |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.; Research Support, U.S. Gov't, P.H.S. |
Journal Detail:
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Title: Photochemistry and photobiology Volume: 80 ISSN: 0031-8655 ISO Abbreviation: Photochem. Photobiol. Publication Date: 2004 Jul-Aug |
Date Detail:
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Created Date: 2004-09-01 Completed Date: 2004-12-17 Revised Date: 2011-09-26 |
Medline Journal Info:
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Nlm Unique ID: 0376425 Medline TA: Photochem Photobiol Country: United States |
Other Details:
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Languages: eng Pagination: 1-6 Citation Subset: IM |
Affiliation:
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Department of Dermatology, University of California-San Francisco, San Francisco, CA, USA. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Cells, Cultured Fibroblasts / physiology*, radiation effects Fluoresceins Humans Infant, Newborn Photons* Reactive Oxygen Species / metabolism* |
| Grant Support | |
ID/Acronym/Agency:
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R01 CA 105958/CA/NCI NIH HHS; R01 CA105958-01/CA/NCI NIH HHS |
| Chemical | |
Reg. No./Substance:
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0/Fluoresceins; 0/Reactive Oxygen Species |
| Comments/Corrections | |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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