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Hypericin and 5-aminolevulinic acid-induced protoporphyrin IX induce enhanced phototoxicity in human endometrial cancer cells with non-coherent white light


Schneider-Yin, Xiaoye; Kurmanaviciene, Aida; Roth, Marion; Roos, Malgorzata; Fedier, André; Minder, Elisabeth I; Walt, Heinrich (2009). Hypericin and 5-aminolevulinic acid-induced protoporphyrin IX induce enhanced phototoxicity in human endometrial cancer cells with non-coherent white light. Photodiagnosis and Photodynamic Therapy, 6(1):12-18.

Abstract

BACKGROUND: The in vitro experiments described in this study were aimed at exploring a synergistic effect between 5-aminolevulinic acid (5-ALA) induced protoporphyrin IX (PpIX) and hypericin. In a previous study, enhanced phototoxicity was observed in a patient during a clinical study on 5-ALA-based photodynamic tumor localization of breast cancer. This patient ingested a hypericin containing plant extract in parallel to orally applied 5-ALA. METHODS: Human endometrial cancer cells (HEC-1A) were treated with 0.5mM of 5-ALA and 60 nM of hypericin, either separately or combined. Colony formation was assessed after illumination of the cells with both red (635 nm) and white light (400-800 nm) at a dose of 2.5 J/cm(2). Porphyrin metabolites were quantified by HPLC in cells treated with photosensitizers without subsequent illumination. RESULTS: After white light illumination, cells treated with a combination of 5-ALA and hypericin had a significant reduction in colony formation compared with cells treated with 5-ALA only. No significantly enhanced toxicity was found with red light and the 5-ALA plus hypericin combination. In addition, cells treated with both 5-ALA and hypericin tended to produce more PpIX than cells treated with 5-ALA only. CONCLUSIONS: This study demonstrated that treatment of endometrial cancer cells with both 5-ALA and hypericin followed by illumination with white light induced a significantly higher phototoxicity as revealed by colony formation. This setting which generated an in vitro effect similar to the patient's situation, might be applied in the future as an affordable and effective photodynamic therapy (PDT) modality.

BACKGROUND: The in vitro experiments described in this study were aimed at exploring a synergistic effect between 5-aminolevulinic acid (5-ALA) induced protoporphyrin IX (PpIX) and hypericin. In a previous study, enhanced phototoxicity was observed in a patient during a clinical study on 5-ALA-based photodynamic tumor localization of breast cancer. This patient ingested a hypericin containing plant extract in parallel to orally applied 5-ALA. METHODS: Human endometrial cancer cells (HEC-1A) were treated with 0.5mM of 5-ALA and 60 nM of hypericin, either separately or combined. Colony formation was assessed after illumination of the cells with both red (635 nm) and white light (400-800 nm) at a dose of 2.5 J/cm(2). Porphyrin metabolites were quantified by HPLC in cells treated with photosensitizers without subsequent illumination. RESULTS: After white light illumination, cells treated with a combination of 5-ALA and hypericin had a significant reduction in colony formation compared with cells treated with 5-ALA only. No significantly enhanced toxicity was found with red light and the 5-ALA plus hypericin combination. In addition, cells treated with both 5-ALA and hypericin tended to produce more PpIX than cells treated with 5-ALA only. CONCLUSIONS: This study demonstrated that treatment of endometrial cancer cells with both 5-ALA and hypericin followed by illumination with white light induced a significantly higher phototoxicity as revealed by colony formation. This setting which generated an in vitro effect similar to the patient's situation, might be applied in the future as an affordable and effective photodynamic therapy (PDT) modality.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:04 Faculty of Medicine > Epidemiology, Biostatistics and Prevention Institute (EBPI)
04 Faculty of Medicine > University Hospital Zurich > Clinic for Gynecology
Dewey Decimal Classification:610 Medicine & health
Language:English
Date:2009
Deposited On:22 Jun 2009 14:43
Last Modified:05 Apr 2016 13:16
Publisher:Elsevier
ISSN:1572-1000
Publisher DOI:10.1016/j.pdpdt.2009.02.001
PubMed ID:19447367
Permanent URL: http://doi.org/10.5167/uzh-19376

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