| Rapid induction of apoptosis in human keratinocytes with the photosensitizer QLT0074 via a direct mitochondrial action. | |
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MedLine Citation:
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PMID: 12766487 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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QLT0074 is a newly introduced, porphyrin-derivative for use in photodynamic therapy (PDT). In the current study, the intracellular distribution of QLT0074 and the mode of cell death induced by photosensitization with this compound in vitro were assessed for transformed human HaCaT keratinocytes. Fluorescence microscopy studies indicated a distribution of the drug to the cytoplasm, nuclear membrane and mitochondria of these cells. In the absence of light, QLT0074 produced no evidence of apoptosis-related biochemical changes or affected cell viability. When combined with blue light exposure, cytotoxicity was exerted in a QLT0074- and light-dose-related manner. Appearance of the mitochondrial protein cytochrome c in the cytosolic fraction and expression of the apoptosis-associated mitochondrial 7A6 antigen were demonstrable following photosensitization at nano-molar levels of QLT0074. Evidence of processing of the apoptosis-effector molecules caspase-3, -6, -7, -8 and -9 as well as cleavage of the caspase-3 substrate poly (ADP-ribose) polymerase (PARP) were demonstrable subsequent to cytochrome c release after PDT. Treatment with the anti-oxidant pyrrolidine dithiocarbamate (PDTC) inhibited cytochrome c release, caspase-3 activation and PARP cleavage associated with PDT thereby supporting the contention that QLT0074 induces apoptosis through the generation of reactive oxygen species upon light activation. QLT0074 is a potent photosensitizer with the capacity to directly initiate apoptosis by acting upon mitochondria. |
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Authors:
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R Li; D J Bounds; D Granville; S H Ip; H Jiang; P Margaron; D W C Hunt |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Apoptosis : an international journal on programmed cell death Volume: 8 ISSN: 1360-8185 ISO Abbreviation: Apoptosis Publication Date: 2003 Jun |
Date Detail:
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Created Date: 2003-05-26 Completed Date: 2004-04-14 Revised Date: 2005-11-17 |
Medline Journal Info:
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Nlm Unique ID: 9712129 Medline TA: Apoptosis Country: United States |
Other Details:
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Languages: eng Pagination: 269-75 Citation Subset: IM |
Affiliation:
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Department of Preclinical Pharmacology, QLT Inc., 887 Great Northern Way, Vancouver, British Columbia, Canada V5T 4T5. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Antioxidants
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pharmacology Apoptosis / drug effects*, radiation effects Caspases / drug effects, radiation effects Cell Compartmentation / drug effects, physiology Cell Line, Transformed Cytochromes c / drug effects, radiation effects Dose-Response Relationship, Drug Humans Keratinocytes / drug effects*, metabolism, radiation effects Membrane Proteins / drug effects, radiation effects Mitochondria / drug effects*, metabolism, radiation effects Photic Stimulation Photochemotherapy Photosensitizing Agents / radiation effects, toxicity* Poly(ADP-ribose) Polymerases Porphyrins / pharmacology*, radiation effects, toxicity* Proteins / drug effects, radiation effects Pyrrolidines / pharmacology Reaction Time / drug effects, radiation effects Reactive Oxygen Species / metabolism Thiocarbamates / pharmacology |
| Chemical | |
Reg. No./Substance:
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0/Antioxidants; 0/Membrane Proteins; 0/Photosensitizing Agents; 0/Porphyrins; 0/Proteins; 0/Pyrrolidines; 0/QLT0074; 0/Reactive Oxygen Species; 0/Thiocarbamates; 0/antigen 7A6; 25769-03-3/pyrrolidine dithiocarbamic acid; 9007-43-6/Cytochromes c; EC 2.4.2.30/PARP1 protein, human; EC 2.4.2.30/Poly(ADP-ribose) Polymerases; EC 3.4.22.-/Caspases |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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