In vitro photodynamic effect of aluminum tetrasulfophthalocyanines on melanoma skin cancer and healthy normal skin cells

• Published in: Photodiagnosis and photodynamic therapy 2012-03, Vol.9 (1), p.32-39
• Main Authors: Maduray, K., B. Tech Biotechnology, M. Tech Biotechnology, Odhav, B, Nyokong, T
• Format: Article
• Language: English
• Subjects: Aluminum tetrasulfophthalocyanines; Cell Death - drug effects; Cell Line, Tumor; Dose-Response Relationship, Drug; Fibroblast cells; Fibroblasts - drug effects; Fluorescent Dyes - administration & dosage; Fluorescent Dyes - pharmacology; Fluorescent Dyes - therapeutic use; Hematology, Oncology and Palliative Medicine; Humans; Indoles - administration & dosage; Indoles - pharmacology; Indoles - therapeutic use; Internal Medicine; Keratinocyte cells; Keratinocytes - drug effects; Melanoma - drug therapy; Melanoma cancer; Organometallic Compounds - administration & dosage; Organometallic Compounds - pharmacology; Organometallic Compounds - therapeutic use; Photochemotherapy - methods; Photodynamic therapy; Photosensitizing Agents - pharmacology; Photosensitizing Agents - therapeutic use; Skin Neoplasms - drug therapy
• ISSN: 1572-1000; 1873-1597
• DOI: 10.1016/j.pdpdt.2011.07.001

Summary Photodynamic therapy is a medical treatment that uses an inactive dye/drug and lasers as a light source to activate the dye/drug to produce a toxic form of oxygen that destroys the cancer cells. This study aimed at investigating the cytotoxic effects of different concentrations of aluminum tetrasulfophthalocyanines in its inactive and active state (laser induced) on melanoma skin cancer cells, healthy normal skin fibroblast and keratinocyte cells. Experimentally, 3 × 104 cells/ml were seeded in 24-well plates before treatment with different concentrations of aluminum tetrasulfophthalocyanines. After 2 h, cells were irradiated with a light dose of 4.5 J/cm2 . Post-irradiated cells were incubated for 24 h before cell viability was measured using the CellTiter-Blue Viability Assay. Results showed that aluminum tetrasulfophthalocyanines at high concentrations were cytotoxic to melanoma cells in the absence of laser activation. In the presence of laser activation of aluminum tetrasulfophthalocyanines at a concentration of 40 μg/ml decreased cell viability of melanoma cells to 45%, fibroblasts to 78% and keratinocytes to 73%. At this photosensitizing concentration of aluminum tetrasulfophthalocyanines the efficacy of the treatment light dose 4.5 J/cm2 and the cell death mechanism induced by photoactivated aluminum tetrasulfophthalocyanines was evaluated. A light dose of 4.5 J/cm2 was more efficient in killing a higher number of melanoma cells and a lower number of fibroblast and keratinocyte cells than the other light doses of 2.5 J/cm2 , 7.5 J/cm2 and 10.5 J/cm2 . Apoptosis features such as blebbing, nucleus condensation, nucleus fragmentation and the formation of apoptotic bodies were seen in the photodynamic therapy treated melanoma skin cancer cells. This in vitro photodynamic therapy study concludes that using aluminum tetrasulfophthalocyanines at a photosensitizing concentration of 40 μg/ml in combination with a laser dose of 4.5 J/cm2 was potentially lethal for melanoma skin cancer cells and less harmful for the normal healthy skin cells.