Abstract:
BACKGROUND:Light fractionation with a 2-h dark interval increases the efficacy of topical aminolevulinic acid (ALA) photodynamic therapy (PDT). Hexyl-aminolevulinate (HAL) is the hexyl ester of ALA. Both HAL and ALA lead to protoporphyrin IX (PpIX) accumulation in endothelial cells and to vascular effects, which are important for light fractionation. We investigated light fractionation for HAL-PDT in a mouse skin model and compared this with ALA. METHODS:Three illumination schemes were studied: (a) 100 J cm(-2) in a single illumination; (b) 50+50 J cm(-2) in a twofold illumination; (c) a small first light fraction until 50% of PpIX was photobleached (ca. 3 J cm(-2)), followed by 97 J cm(-2) 2h later. PpIX fluorescence was measured continuously during illumination. Efficacy was evaluated by daily visual skin damage scoring up to 7 days after PDT. RESULTS:Light fractionation showed a trend towards increased efficacy for HAL-PDT. Both the initial PpIX synthesis and the PpIX resynthesis during the dark interval were higher for ALA, but these were not correlated with efficacy. Single HAL-PDT was more effective than single ALA-PDT. Photobleaching rates of HAL and ALA were similar indicating similar biodistributions at depth. CONCLUSION:Our results provide evidence to support that light fractionation may be beneficial for HAL-PDT. We are cautious because we found only a non-significant increase in response. However, combining our results with literature data suggest that the illumination scheme may be further optimized for HAL-PDT to potentially enhance the effect of light fractionation.
journal_name
Photodiagnosis Photodyn Therjournal_title
Photodiagnosis and photodynamic therapyauthors
Middelburg TA,de Bruijn HS,van der Ploeg-van den Heuvel A,Neumann HA,Robinson DJdoi
10.1016/j.pdpdt.2013.09.002subject
Has Abstractpub_date
2013-12-01 00:00:00pages
703-9issue
4eissn
1572-1000issn
1873-1597pii
S1572-1000(13)00116-6journal_volume
10pub_type
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journal_title:Photodiagnosis and photodynamic therapy
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journal_title:Photodiagnosis and photodynamic therapy
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journal_title:Photodiagnosis and photodynamic therapy
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doi:10.1016/j.pdpdt.2015.11.002
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pub_type: 杂志文章
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journal_title:Photodiagnosis and photodynamic therapy
pub_type: 杂志文章
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更新日期:2012-12-01 00:00:00
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journal_title:Photodiagnosis and photodynamic therapy
pub_type: 杂志文章
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更新日期:2005-09-01 00:00:00
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journal_title:Photodiagnosis and photodynamic therapy
pub_type: 杂志文章
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更新日期:2016-03-01 00:00:00
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pub_type: 杂志文章
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