Abstract:
BACKGROUND:Photodynamic therapy (PDT) is a non-surgical method for treating non-melanoma skin cancer and precancerous lesions which involves the activation of a photosensitizer by visible light to produce activated oxygen species within target cells, resulting in the destruction of the latter. The present study evaluates the effect of PDT on primary normal and basal cell carcinoma cultures in vitro. METHODS:Primary human keratinocytes and carcinoma cell cultures were exposed to various concentrations of 5,10,15,20-tetra-(para-methoxyphenyl) porphyrin (TMP) and its zinc compound (Zn-TMP) for 24 hours, with or without chitosan, and then irradiated using a PDT lamp (630 nm, 6 J/cm(2)). The effects of PDT were assessed using a 3-(4,5-dimethylthiazol-2-yl)-5-(3-carboxymethoxyphenyl)-2-(4-sulfophenyl)-2H-tetrazolium inner salt (MTS) assay and an immunocytochemical method with Annexin V-FITC for detecting apoptosis. RESULTS:Both tested substances, TMP and Zn-TMP, had a phototoxic effect on primary human carcinoma cell cultures in concentrations of 1-100 μg/ml, which positively correlated with the concentration of the photosensitizer. There was no phototoxic effect on primary keratinocytes, probably because of the preferential accumulation of photosensitizing substances in tumoral cells. Administration of chitosan in association with photosensitizing substances increased cell viability compared with photosensitizers alone, exerting a cytoprotective effect. CONCLUSIONS:The study demonstrates that the photodynamic activity of TMP and its metalloporphyrin derivative is limited to primary human carcinoma cells and suggests that these porphyrins could be efficiently used in PDT in vivo.
journal_name
Int J Dermatoljournal_title
International journal of dermatologyauthors
Susan M,Baldea I,Senila S,Macovei V,Dreve S,Ion RM,Cosgarea Rdoi
10.1111/j.1365-4632.2010.04700.xsubject
Has Abstractpub_date
2011-03-01 00:00:00pages
280-6issue
3eissn
0011-9059issn
1365-4632journal_volume
50pub_type
杂志文章abstract:BACKGROUND:The objective of this study was to determine the presence of anti-Dsg1 and Dsg3 antibodies in healthy subjects of the high Peruvian Amazon (Tuemal, Rodriguez de Mendoza province, department of Amazonas) to establish the theoretical presence of environmental factors or triggers in the area. MATERIALS AND MET...
journal_title:International journal of dermatology
pub_type: 杂志文章
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更新日期:2018-03-01 00:00:00
abstract:BACKGROUND:Basal cell carcinomas (BCCs) are the most frequent human cancer that results from malignant transformation of basal cells in the epidermis. Gorlin syndrome is a rare inherited autosomal dominant disease that predisposes with multiple BCCs and other birth defects. Both sporadic and inherited BCCs are associat...
journal_title:International journal of dermatology
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abstract:BACKGROUND:Steatocystoma multiplex is an uncommon disorder which usually begins in adolescence or early adult life. The condition can be hereditary, as an autosomal dominant trait, or nonhereditary, as in this case. METHODS:A 40-year-old woman presented with a history of asymptomatic nodules that began around puberty ...
journal_title:International journal of dermatology
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journal_title:International journal of dermatology
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journal_title:International journal of dermatology
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journal_title:International journal of dermatology
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journal_title:International journal of dermatology
pub_type: 杂志文章
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