Photodynamic effects of hypericin on lipid peroxidation and antioxidant status in melanoma cells

Hadjur, Christophe, Richard, Marie-Jeanne, Parat, Marie-Odile, Jardon, Pierre and Favier, Alain (1996) Photodynamic effects of hypericin on lipid peroxidation and antioxidant status in melanoma cells. Photochemistry and Photobiology, 64 2: 375-381. doi:10.1111/j.1751-1097.1996.tb02474.x


Author Hadjur, Christophe
Richard, Marie-Jeanne
Parat, Marie-Odile
Jardon, Pierre
Favier, Alain
Title Photodynamic effects of hypericin on lipid peroxidation and antioxidant status in melanoma cells
Journal name Photochemistry and Photobiology   Check publisher's open access policy
ISSN 0031-8655
1751-1097
Publication date 1996-08
Sub-type Article (original research)
DOI 10.1111/j.1751-1097.1996.tb02474.x
Volume 64
Issue 2
Start page 375
End page 381
Total pages 7
Place of publication Hoboken, NJ, United States
Publisher Wiley-Blackwell Publishing
Language eng
Formatted abstract
Photodynamic-induced cytotoxicity by hypericin (HYP) was studied on three human melanoma cell lines: one pigmented cell line (G361) and two amelanotic cell lines (M18 and M6). No significant variation in the rate of uptake and in the maximum level of HYP incorporation for the different cells was observed. In the dark, no cytotoxicity was observed in the range0–10−6M HYP for the three cell lines. Amelanotic cells were found to be more sensitive than pigmented cells to irradiation of HYP with visible light (Λ > 590 nm). In addition, for the three cell lines HYP-induced photocytotoxicity was found to be drug-dose and light-dose dependent. Under the conditions used, thiobarbituric acid-reacting substances (TBARs) were significantly increased in amelanotic cells after irradiation (P < 0.0001). By contrast, the amount of TBARS remained unchanged in pigmented cells. Antioxidant defenses including enzymes and glutathione (GSH) were assayed before and after HYP photosensitization. Significantly increased total SOD activity was observed after photosensitization for amelanotic cells (P < 0.05), while glutathione peroxidase (GSHPx) and catalase (Cat) activities but also GSH levels were significantly decreased (P < 0.01). In pigmented cells a significantly increased Cat activity was found (P < 0.05), whereas GSHPx was unaffected after irradiation. It can be inferred that (a) HYP may be an effective PDT agent for melanoma and (b) there is a relationship between melanin content and sensitivity to HYP phototoxicity in human melanoma cells.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Pharmacy Publications
 
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Created: Mon, 20 Dec 2010, 13:46:30 EST